Fair Value Disclosures [Abstract] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value, Hierarchy [Axis] Fair Value, Hierarchy [Axis] Fair Value Hierarchy [Domain] Fair Value Hierarchy [Domain] Fair Value, Level 1 [Member] Fair Value, Inputs, Level 1 [Member] Fair Value, Level 2 [Member] Fair Value, Inputs, Level 2 [Member] Fair Value, Level 3 [Member] Fair Value, Inputs, Level 3 [Member] Class of Financing Receivable [Axis] Class of Financing Receivable [Axis] Class of Financing Receivable [Domain] Class of Financing Receivable [Domain] Commercial [Member] Commercial Loan [Member] Commercial real estate [Member] Commercial Real Estate Portfolio Segment [Member] Construction and development [Member] Construction And Development Financial Receivable [Member] Construction And Development Financial Receivable [Member] Residential real estate [Member] Residential Real Estate Financial Receivable [Member] Residential Real Estate Financial Receivable [Member] Consumer [Member] Consumer Portfolio Segment [Member] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Residential mortgage loans held for sale Loans Held-for-sale, Fair Value Disclosure Collateral-dependent impaired loans Impaired loans, fair value Impaired Loans Fair Value Disclosure Foreclosed properties Other Real Estate, Foreclosed Assets Other Real Estate, Foreclosed Assets Loans and Leases Receivable Disclosure [Abstract] Schedule of Financing Receivables Past Due [Table] Schedule of Financing Receivables Past Due [Table] Commercial Loan [Member] Owner Occupied [Member] Owner Occupied [Member] Owner Occupied [Member] Non Owner Occupied [Member] Non Owner Occupied [Member] Non Jumbo [Member] Land And Land Improvements [Member] Land and Land Improvements [Member] Construction Loans [Member] Construction Loans [Member] Non Jumbo [Member] Non Jumbo [Member] Nongovernment Sponsored Agencies [Member] Jumbo [Member] Jumbo [Member] Jumbo [Member] Home Equity [Member] Home Equity Line of Credit [Member] Consumer Portfolio Segment [Member] Other Loans [Member] Other Loans [Member] Other Loans [Member] Financing Receivable, Recorded Investment, Past Due [Line Items] Financing Receivable, Recorded Investment, Past Due [Line Items] Past Due, 30-59 days Financing Receivable, Recorded Investment, 30 to 59 Days Past Due Past Due, 60-89 days Financing Receivable, Recorded Investment, 60 to 89 Days Past Due Past Due, greater than 90 days Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due Past Due, Total Financing Receivable, Recorded Investment, Past Due Current Financing Receivable, Recorded Investment, Current Recorded Investment greater then 90 days and Accruing Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing Schedule of Impaired Financing Receivable [Table] Schedule of Impaired Financing Receivable [Table] Construction [Member] Construction [Member] Construction. Total Without a Related Allowance Total Without a Related Allowance Total Without Related Allowance. Total With a Related Allowance Total With a Related Allowance Total With Related Allowance. Total Commercial Total Commercial Total Commercial. Total Residential Real Estate Total Residential Real Estate Total Residential Real Estate. Total Consumer Total Consumer Total Consumer. Financing Receivable, Impaired [Line Items] Financing Receivable, Impaired [Line Items] Without a related allowance, Recorded Investment Impaired Financing Receivable, with No Related Allowance, Recorded Investment Without a related allowance, Unpaid Principal Balance Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance Without a related allowance, Average Impaired Balance Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment Without a related allowance, Interest Income Recognized while impaired Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method With a related allowance, Recorded Investment Impaired Financing Receivable, with Related Allowance, Recorded Investment With a related allowance, Unpaid Principal Balance Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance With a related allowance, Related Allowance ImpairedFinancingReceivableWithRelatedAllowanceRelatedAllowance Impaired Financing Receivable With Related Allowance Related Allowance With a related allowance, Average Impaired Balance Impaired Financing Receivable, with Related Allowance, Average Recorded Investment With a related allowance, Interest Income Recognized while impaired Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method Recorded Investment Impaired Financing Receivable, Recorded Investment Unpaid Principal Balance Impaired Financing Receivable, Unpaid Principal Balance Related Allowance Impaired Financing Receivable, Related Allowance Average Impaired Balance Impaired Financing Receivable, Average Recorded Investment Interest Income Recognized while impaired Impaired Financing Receivable, Interest Income, Accrual Method Available-for-sale Securities [Abstract] Available-for-sale Securities Available-for-sale Securities [Table Text Block] Summary Of Volume of State and Political Subdivision Securities Held in Portfolio Summary Of Volume of State and Political Subdivision Securities Held in Portfolio Summary Of Volume of State and Political Subdivision Securities Held in Portfolio Schedule of Realized Gain (Loss) Schedule of Realized Gain (Loss) [Table Text Block] Investments Classified by Contractual Maturity Date Investments Classified by Contractual Maturity Date [Table Text Block] Schedule of Unrealized Loss on Investments Schedule of Unrealized Loss on Investments [Table Text Block] Commitments and Contingencies Disclosure [Abstract] Summary Of The Total Unfunded, Or Off-Balance Sheet, Credit Extension Commitments Summary Of The Total Unfunded, Or Off-Balance Sheet, Credit Extension Commitments [Table Text Block] Schedule of Total Unfunded Commitments Due in one year or less, Amortized Cost Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis Due from one to five years, Amortized Cost Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis Due from five to ten years, Amortized Cost Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis Due after ten years, Amortized Cost Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis Equity securities, Amortized Cost Available-for-sale Equity Securities, Amortized Cost Basis Total Amortized Cost Available-for-sale Securities, Amortized Cost Basis Due in one year or less, Estimated Fair Value Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value Due from one to five years, Estimated Fair Value Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value Due from five to ten years, Estimated Fair Value Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Fair Value Due after ten years, Estimated Fair Value Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value Equity securities, Estimated Fair Value Available-for-sale Securities, Equity Securities Total Estimated Fair Value Available-for-sale Securities, Debt Securities Property, Plant and Equipment Assets Held-for-sale Disclosure [Abstract] Activity of Property Held for Sale [Roll Forward] Other Real Estate [Roll Forward] Beginning balance Other Real Estate, Foreclosed Assets, and Repossessed Assets Acquisitions Real Estate Acquired Through Foreclosure Capitalized improvements SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements Dispositions DispositionAmountOfPropertyHeldForSale Disposition Amount Of Property Held For Sale Valuation adjustments OtherRealEstateAndForeclosedAssetsValuationAdjustments Other Real Estate And Foreclosed Assets, Valuation Adjustments Balance at year end Income Tax Disclosure [Abstract] Current Current Income Tax Expense (Benefit), Continuing Operations [Abstract] Federal Current Federal Tax Expense (Benefit) State Current State and Local Tax Expense (Benefit) Total Current Current Income Tax Expense (Benefit) Deferred Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] Federal Deferred Federal Income Tax Expense (Benefit) State Deferred State and Local Income Tax Expense (Benefit) Total Deferred Deferred Income Tax Expense (Benefit) Applicable income taxes Income Tax Expense (Benefit) Debt Disclosure [Abstract] Reverse Repurchase Agreements, Number of Unaffiliated Institutions Reverse Repurchase Agreements, Number of Unaffiliated Institutions Reverse Repurchase Agreements, Number of Unaffiliated Institutions Basis spread on variable rate Debt Instrument, Basis Spread on Variable Rate Long-term borrowings Long-term Debt Average interest rate paid on long-term borrowings Long-term Debt, Weighted Average Interest Rate Borrowed Funds Debt Disclosure [Text Block] Employee Benefits and Share-based Compensation [Abstract] Employee Stock Ownership Plan (ESOP) Disclosures Employee Stock Ownership Plan (ESOP) Disclosures [Table Text Block] Schedule of Stock Options, Activity Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] Schedule of Shares Authorized under Stock Option Plans, by Exercise Price Range Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block] Quarterly Financial Data [Abstract] Quarterly Financial Data Quarterly Financial Information [Text Block] Deferred tax assets Deferred Tax Assets, Net [Abstract] Allowance for loan losses Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Provision for Loan Losses Depreciation Deferred tax assets, Depreciation Deferred Tax Assets, Depreciation Foreclosed properties Deferred Tax Assets, Other Deferred compensation Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Compensation Other deferred costs and accrued expenses Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Other Other-than-temporarily impaired securities Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Impairment Losses Net unrealized loss on interest rate swaps Deferred Tax Assets, Derivative Instruments NOL and tax credit carryforwards Deferred Tax Assets, Operating Loss Carryforwards Total Deferred Tax Assets, Gross Deferred tax liabilities Deferred Tax Liabilities, Net [Abstract] Accretion on tax-exempt securities Deferred tax liabilities, Accretion on tax-exempt securities Deferred Tax Liabilities, Accretion On Tax-exempt Securities Net unrealized gain on securities available for sale Deferred tax liabilities, Net unrealized gain on securities available for sale Deferred Tax Liabilities Unrealized Loss On Available-for-sale Securities Purchase accounting adjustments and goodwill Deferred tax liabilities, Purchase accounting adjustments and goodwill Deferred Tax Liabilities, Purchase Accounting Adjustments And Goodwill Total Deferred Tax Liabilities, Gross Net deferred tax assets Deferred Tax Assets, Net Deposits [Abstract] Three months or less Contractual Maturities, Time Deposits, $100,000 or More, Three Months or Less Three through six months Contractual Maturities, Time Deposits, $100,000 or More, Three Months Through Six Months Six through twelve months Contractual Maturities, Time Deposits, $100,000 or More, Six Months Through 12 Months Over twelve months Contractual Maturities, Time Deposits, $100,000 or More, after 12 Months Total Time Deposits, $100,000 or More Three months or less, percentage Three months or less, percentage Percentage Of Time Deposits 100000 Or More Three Months Or Less To Total Time Deposits 100000 Or More Three through six months, percentage Three through six months, percentage Percentage Of Time Deposits 100000 Or More Three Months Through Six Months To Total Time Deposits 100000 Or More Six through twelve months, percentage Six through twelve months, percentage Percentage Of Time Deposits 100000 Or More Six Months through 12 months To Total Time Deposits 100000 Or More Over twelve months, percentage Over twelve months, percentage Percentage Of Time Deposits 100000 Or More After 12 Months To Total Time Deposits 100000 Or More Total, percentage Total, percentage Percentage Total Of Maturity Distribution Of Time Deposits 100,000 Or More Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Commercial Real Estate Portfolio Segment [Member] Residential Portfolio Segment [Member] Residential Portfolio Segment [Member] Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Loan maturities, Within 1 Year Loan maturities, Within 1 Year Loans And Leases Receivable, Maturities Within One Year Loan maturities, After 1 but within 5 Years Loan maturities, After 1 but within 5 Years Loans And Leases Receivable, Maturities After One But Within Five Years Loan maturities, After 5 Years Loan maturities, After 5 Years Loans And Leases Receivable, Maturities After Five Years Loans due after one year with: Variable rates Loans due after one year with: Variable rates Loans And Leases Receivable, Maturities After One Year With Variable Rates Loans due after one year with: Fixed rates Loans due after one year with: Fixed rates Loans And Leases Receivable, Maturities After One Year With Fixed Rates Loans due after one year Loans due after one year Loans And Leases Receivable, Maturities After One Year Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Long-term borrowings [Member] Long-term Debt [Member] Subordinated debentures owed to unconsolidated subsidiary trusts [Member] Subordinated Debentures Owed To Unconsolidated Subsidiary Trusts [Member] Subordinated Debentures Owed To Unconsolidated Subsidiary Trusts [Member] Statement [Line Items] Statement [Line Items] 2016 Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 2017 Long-term Debt, Maturities, Repayments of Principal in Year Two 2018 Long-term Debt, Maturities, Repayments of Principal in Year Three 2019 Long-term Debt, Maturities, Repayments of Principal in Year Four 2020 Long-term Debt, Maturities, Repayments of Principal in Year Five Thereafter Long-term Debt, Maturities, Repayments of Principal after Year Five Total Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward] Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward] ScheduleOfFinancingReceivableRecordedInvestmentCreditQualityIndicatorBasedOnAgingStatus [Table] ScheduleOfFinancingReceivableRecordedInvestmentCreditQualityIndicatorBasedOnAgingStatus [Table] Schedule Of Default Troubled Debt Restructuring [Table] Internal Credit Assessment [Axis] Internal Credit Assessment [Axis] Internal Credit Assessment [Domain] Internal Credit Assessment [Domain] Performing Financing Receivable [Member] Performing Financing Receivable [Member] Nonperforming Financing Receivable [Member] Nonperforming Financing Receivable [Member] Financing Receivable, Recorded Investment [Line Items] Financing Receivable, Recorded Investment [Line Items] Total FinancingReceivableCreditQualityRecordedInvestment Financing Receivable, Credit Quality, Recorded Investment Deposits Deposit Liabilities Disclosures [Text Block] Banking and Thrift [Abstract] Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table] Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] Summit [Member] Summit [Member] Summit [Member] Summit Community [Member] Summit Community [Member] Summit Community [Member] Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] Tier One Common Equity Tier One Common Equity Tier One Common Equity Tier One Common Equity to Risk Weighted Assets Tier One Common Equity to Risk Weighted Assets Tier One Common Equity to Risk Weighted Assets Tier One Common Equity Required for Capital Adequacy Tier One Common Equity Required for Capital Adequacy Tier One Common Equity Required for Capital Adequacy Tier One Common Equity Required for Capital Adequacy to Risk Weighted Assets Tier One Common Equity Required for Capital Adequacy to Risk Weighted Assets Tier One Common Equity Required for Capital Adequacy to Risk Weighted Assets Tier One Common Equity Required to be Well Capitalized Tier One Common Equity Required to be Well Capitalized Tier One Common Equity Required to be Well Capitalized Tier One Common Equity Required to be Well Capitalized to Risk Weighted Assets Tier One Common Equity Required to be Well Capitalized to Risk Weighted Assets Tier One Common Equity Required to be Well Capitalized to Risk Weighted Assets Total Capital (to risk weighted assets), Actual Amount Capital Total Capital (to risk weighted assets), Actual Ratio Capital to Risk Weighted Assets Total Capital (to risk weighted assets), Minimum Required Regulatory Capital, Amount Capital Required for Capital Adequacy Total Capital (to risk weighted assets), Minimum Required Regulatory Capital, Ratio Capital Required for Capital Adequacy to Risk Weighted Assets Total Capital (to risk weighted assets), To be Well Capitalized under Prompt Corrective Action Provisions, Amount Capital Required to be Well Capitalized Total Capital (to risk weighted assets), To be Well Capitalized under Prompt Corrective Action Provisions, Ratio Capital Required to be Well Capitalized to Risk Weighted Assets Tier I Capital (to risk weighted assets ), Actual Amount Tier One Risk Based Capital Tier I Capital (to risk weighted assets), Actual Ratio Tier One Risk Based Capital to Risk Weighted Assets Tier I Capital (to risk weighted assets), Minimum Required Regulatory Capital, Amount Tier One Risk Based Capital Required for Capital Adequacy Tier I Capital (to risk weighted assets), Minimum Required Regulatory Capital, Ratio Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets Tier I Capital (to risk weighted assets), To be Well Capitalized under Prompt Corrective Action Provisions, Amount Tier One Risk Based Capital Required to be Well Capitalized Tier I Capital (to risk weighted assets), To be Well Capitalized under Prompt Corrective Action Provisions, Ratio Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets Tier I Capital (to average assets), Actual Amount Tier One Leverage Capital Tier I Capital (to average assets), Actual Ratio Tier One Leverage Capital to Average Assets Tier I Capital (to average assets), Minimum Required Regulatory Capital, Amount Tier One Leverage Capital Required for Capital Adequacy Tier I Capital (to average assets), Minimum Required Regulatory Capital, Ratio Tier One Leverage Capital Required for Capital Adequacy to Average Assets Tier I Capital (to average assets), To be Well Capitalized under Prompt Corrective Action Provisions, Amount Tier One Leverage Capital Required to be Well Capitalized Tier I Capital (to average assets), To be Well Capitalized under Prompt Corrective Action Provisions, Ratio Tier One Leverage Capital Required to be Well Capitalized to Average Assets Statement of Stockholders' Equity [Abstract] Statement [Table] Statement [Table] Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Series 2009 Preferred Stock [Member] Series A Preferred Stock [Member] Series 2011 Preferred Stock [Member] Series B Preferred Stock [Member] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Common Stock and Related Surplus [Member] Common Stock and Related Surplus Custom Element. Unearned ESOP Shares [Member] Unearned ESOP Shares [Member] Unearned ESOP Shares [Domain] Retained Earnings [Member] Retained Earnings [Member] Preferred Stock [Member] Preferred Stock [Member] Accumulated Other Comprehensive Income [Member] Accumulated Other Comprehensive Income (Loss) [Member] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Beginning Balance Stockholders' Equity Attributable to Parent Comprehensive income: Statement of Comprehensive Income [Abstract] Net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Other comprehensive income Other Comprehensive Income (Loss), Net of Tax Total comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Exercise of stock options Stock Issued During Period, Value, Stock Options Exercised Stock compensation expense Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Series 2009 Preferred Stock cash dividends declared ($80.00 per share for the years ended December 31, 2014, 2013, and 2012, respectfully) SeriesDividendsPreferredStockCash Series A Dividends Preferred Stock Cash Series 2011 Preferred Stock cash dividends declared ($40.00 per share for the years ended December 31, 2014, 2013, and 2012, respectfully) SeriesBDividendsPreferredStockCash Series B Dividends Preferred Stock Cash Conversion of Preferred Stock to Common Stock Conversion of Stock, Amount Converted Issuance of 499,665 shares of common stock Stock Issued During Period, Value, New Issues Ending Balance Purchase of unallocated common stock held by ESOP Purchase of unallocated common stock held by ESOP Purchase of unallocated common stock held by ESOP Stock Issued During Period, Value, Employee Stock Ownership Plan Stock Issued During Period, Value, Employee Stock Ownership Plan Stock Repurchased and Retired During Period, Value Stock Repurchased and Retired During Period, Value Dividends, Common Stock, Cash Dividends, Common Stock, Cash Goodwill and Intangible Assets Disclosure [Abstract] Schedule of Indefinite-Lived Intangible Assets [Table] Schedule of Indefinite-Lived Intangible Assets [Table] Segments [Axis] Segments [Axis] Segments [Domain] Segments [Domain] Community Banking [Member] Community Banking [Member] Community Banking [Member] Insurance Services [Member] Insurance Services [Member] Insurance Services [Member] Goodwill [Line Items] Goodwill [Line Items] Unidentifiable intangible assets [Abstract] Unidentifiable intangible assets [Abstract] Unidentifiable intangible assets [Abstract] Gross carrying amount Indefinite-Lived Intangible Assets (Excluding Goodwill) Less: accumulated amortization Unidentifiable intangible assets, Less: accumulated amortization Indefinite-Lived Intangible Assets, Accumulated Amortization Net carrying amount IndefiniteLivedIntangibleAssetsNet Indefinite-Lived Intangible Assets, Net Identifiable intangible assets [Abstract] Identifiable intangible assets [Abstract] Identifiable intangible assets [Abstract] Gross carrying amount Finite-Lived Intangible Assets, Gross Less: accumulated amortization Finite-Lived Intangible Assets, Accumulated Amortization Net carrying amount Finite-Lived Intangible Assets, Net Summary Of Loans, Net Of Unearned Fees Summary Of Loans, Net Of Unearned Fees [Table Text Block] Schedule of Loans, Net of Unearned Fees [Table Text Block] Schedule Of Loan Maturities Schedule Of Loan Maturities Schedule Of Loan Maturities [Table Text Block] Schedule Of Contractual Aging Of Recorded Investment In Past Due Loans By Class Schedule Of Contractual Aging Of Recorded Investment In Past Due Loans By Class [Table Text Block] Past Due Financing Receivables Including Some Impaired Loans [Table Text Block] Schedule of Financing Receivables, Non Accrual Status Schedule of Financing Receivables, Non Accrual Status [Table Text Block] Schedule Of Method Used To Measure Impairment Of Impaired Loans Schedule Of Method Used To Measure Impairment Of Impaired Loans [Table Text Block] Method Used To Measure Impairment Of Impaired Loans [Table Text Block] Impaired Financing Receivables Impaired Financing Receivables [Table Text Block] Troubled Debt Restructurings on Financing Receivables Troubled Debt Restructurings on Financing Receivables [Table Text Block] Schedule Of Defaults During Stated Period Of Trouble Debt Restructurings Schedule Of Defaults During Stated Period Of Trouble Debt Restructurings [Table Text Block] Default Troubled Debts Restructurings On Financing Receivables [Table Text Block] Schedule of the Activity Regarding TDRs by Loan Type Schedule of the Activity Regarding TDRs by Loan Type [Table Text Block] Schedule of the Activity Regarding TDRs by Loan Type. Financing Receivable Credit Quality Indicators Financing Receivable Credit Quality Indicators [Table Text Block] Schedule Of Recorded Investment Evaluated Based On Aging Status Of Loans And Payment Activity Schedule Of Recorded Investment Evaluated Based On Aging Status Of Loans And Payment Activity [Table Text Block] Schedule of Recorded Investment Evaluated Based on Aging Status of Loans And Payment Activity Schedule of Related Party Loans Aggregating $60,000 or More Schedule of Related Party Transactions [Table Text Block] Equity [Abstract] Schedule of Stock by Class [Table] Schedule of Stock by Class [Table] Preferred Non-Convertible Stock [Member] Preferred Non-Convertible Stock [Member] Class of Stock [Line Items] Class of Stock [Line Items] Shares issued Preferred Stock, Shares Issued Preferred stock, including additional paid in capital Preferred Stock, Including Additional Paid in Capital Dividend rate Preferred Stock, Dividend Rate, Percentage Par value Preferred Stock, Par or Stated Value Per Share Liquidation preference per share Preferred Stock, Liquidation Preference Per Share Redemption price per share Preferred Stock, Redemption Price Per Share Threshold trading days Preferred Stock, Convertible, Threshold Trading Days Preferred Stock, Convertible, Threshold Trading Days Conversion threshold consecutive trading days Preferred Stock, Convertible, Threshold Consecutive Trading Days Preferred Stock, Convertible, Threshold Consecutive Trading Days Threshold percentage of preferred stock redemption price per share Threshold Percentage Of Preferred Stock Redemption Price Per Share Threshold Percentage Of Preferred Stock Redemption Price Per Share Schedule of Goodwill [Table] Schedule of Goodwill [Table] Goodwill [Roll Forward] Goodwill [Roll Forward] Beginning balance Goodwill Acquired goodwill, net Goodwill, Acquired During Period Ending balance Total other-than-temporary impairment losses Other than Temporary Impairment Losses, Investments, Available-for-sale Securities Non-credit related other-than-temporary impairment on available for sale debt securities Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Loss, before Tax, Including Portion Attributable to Noncontrolling Interest, Available-for-sale Securities Net impairment loss recognized in earnings Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net, Available-for-sale Securities Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative [Table] Derivative [Table] Financial Instrument [Axis] Financial Instrument [Axis] Financial Instruments [Domain] Financial Instruments [Domain] Long-term Debt [Member] Hedging Relationship [Axis] Hedging Relationship [Axis] Hedging Relationship [Domain] Hedging Relationship [Domain] Cash Flow Hedging [Member] Cash Flow Hedging [Member] Fair Value Hedging [Member] Fair Value Hedging [Member] Derivative Instrument [Axis] Derivative Instrument [Axis] Derivative Contract [Domain] Derivative Contract [Domain] Interest Rate Swap [Member] Interest Rate Swap [Member] Derivative [Line Items] Derivative [Line Items] Derivative, notional amount Derivative, Notional Amount Fair Value Hedge Assets Fair Value Hedge Assets Fair Value Hedge Liabilities Fair Value Hedge Liabilities Gain (Loss) on Fair Value Hedge Ineffectiveness, Net Gain (Loss) on Fair Value Hedge Ineffectiveness, Net Temporarily Impaired Securities [Table] Temporarily Impaired Securities [Table] Temporarily Impaired Securities [Table] ImpairedFinancingReceivableMethodsToMeasureImpairmentOfImpairedLoans [Axis] ImpairedFinancingReceivableMethodsToMeasureImpairmentOfImpairedLoans [Axis] Impaired Financing Receivable, Methods To Measure Impairment Of Impaired Loans [Axis] ImpairedFinancingReceivableMethodsToMeasureImpairmentOfImpairedLoans [Domain] ImpairedFinancingReceivableMethodsToMeasureImpairmentOfImpairedLoans [Domain] Impaired Financing Receivable Methods To Measure Impairment Of Impaired Loans [Domain] Fair Value Of Collateral [Member] Fair Value Of Collateral [Member] Fair Value Of Collateral [Member] Discounted Cash Flow [Member] Discounted Cash Flow [Member] Discounted Cash Flow [Member] Impaired Financing Receivable, Unpaid Principal Balance Securities Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Fair Value Measurements, Nonrecurring Fair Value Measurements, Nonrecurring [Table Text Block] Fair Value, by Balance Sheet Grouping Fair Value, by Balance Sheet Grouping [Table Text Block] Employee Benefits Pension and Other Postretirement Benefits Disclosure [Text Block] Schedule of Financing Receivable, Recorded Investment, Credit Quality Indicator [Table] Schedule of Financing Receivable, Recorded Investment, Credit Quality Indicator [Table] Pass [Member] Pass [Member] Special Mention [Member] Special Mention [Member] Substandard [Member] Substandard [Member] Doubtful [Member] Doubtful [Member] Loss [Member] Loss [Member] Loss [Member] Total Loans and Leases Receivable, Gross Securities available for sale, Proceeds from Sales Proceeds from Sale of Available-for-sale Securities Securities available for sale, Proceeds from Calls and Maturities Proceeds from Maturities, Prepayments and Calls of Available-for-sale Securities Securities available for sale, Proceeds from Principal Payments Principal payments received on securities available for sale Proceeds From Prepayments Of Available For Sale Securities Securities available for sale, Gross realized Gains Available-for-sale Securities, Gross Realized Gains Securities available for sale, Gross realized Losses Available-for-sale Securities, Gross Realized Losses Nonaccrual loans Financing Receivable, Recorded Investment, Nonaccrual Status Schedule of Subsidiary or Equity Method Investee [Table] Schedule of Subsidiary or Equity Method Investee [Table] Scenario [Axis] Scenario [Axis] Scenario, Unspecified [Domain] Scenario, Unspecified [Domain] Scenario, Forecast [Member] Scenario, Forecast [Member] Sale of Stock [Axis] Sale of Stock [Axis] Sale of Stock [Domain] Sale of Stock [Domain] Private Placement [Member] Private Placement [Member] Rights Offering [Member] Rights Offering [Member] Rights Offering [Member] Subsidiary or Equity Method Investee [Line Items] Subsidiary or Equity Method Investee [Line Items] Number of shares authorized to sell Common Stock, Shares, Authorized to Sell Common Stock, Shares, Authorized to Sell Common stock, shares issued Common Stock, Shares, Issued Percent of outstanding common stock Percentage of Outstanding Common Stock Percentage of Outstanding Common Stock Share price Share Price Number of closings Sale of Stock, Number of Closings Sale of Stock, Number of Closings Number of shares Stock Issued During Period, Shares, New Issues Aggregate price Sale of Stock, Consideration Received Per Transaction Net proceeds from issuance of common stock Proceeds from Issuance of Common Stock Derivative Financial Instruments Financial Instruments Disclosure [Text Block] Property, Plant and Equipment [Abstract] Property, Plant and Equipment Property, Plant and Equipment [Table Text Block] Interest income Interest and Dividend Income, Operating Net interest income Interest Income (Expense), Net Net income Net income applicable to common shares Net Income (Loss) Available to Common Stockholders, Basic Basic earnings per share Earnings Per Share, Basic Diluted earnings per share Earnings Per Share, Diluted Total loans, net of unearned fees Loans and Leases Receivable, Net of Deferred Income Less allowance for loan losses Loans and Leases Receivable, Allowance Loans, net Loans Receivable, Net Time Deposits in denominations that meet or exceed the FDIC Insurance limit Time Deposits in denominations that meet or exceed the FDIC Insurance limit Time Deposits in denominations that meet or exceed the FDIC Insurance limit Time deposits acquired through a third party (brokered deposits) Deposits, Wholesale Time Deposits, $100,000 or More Related party deposit liabilities Related Party Deposit Liabilities Schedule of Interest Rate Derivatives Schedule of Interest Rate Derivatives [Table Text Block] Condensed Financial Information of Parent Company Only Disclosure [Abstract] Parent Company [Member] Parent Company [Member] Dividends from subsidiaries Dividends from subsidiaries Dividends From Subsidiaries Other dividends and interest income Interest and Other Income Realized securities gains Available-for-sale Securities, Gross Realized Gain (Loss), Excluding Other than Temporary Impairments Management and service fees from subsidiaries Management and service fees from subsidiaries Management And Service Fees From Subsidiaries Total income Revenues Interest expense Interest Expense Operating expenses Operating Expenses Total expenses Total expenses Expenses Income before income taxes Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest Income tax expense Income before equity in undistributed income of subsidiaries Income (loss) before equity in undistributed income of subsidiaries Income (Loss) Before Retained Earnings, Undistributed Earnings from Equity Method Investees Equity in (distributed) undistributed income of subsidiaries Equity in (distributed) undistributed income of subsidiaries Equity In (Distributed) Undistributed Income Of Subsidiaries Net Income Dividends on preferred shares Preferred Stock Dividends, Income Statement Impact Net income (loss) applicable to common shares Forward Contracts [Member] Forward Contracts [Member] Derivative, by Nature [Axis] Derivative, by Nature [Axis] Derivative, Name [Domain] Derivative, Name [Domain] Effective July 18, 2016 [Member] Effective July 18, 2016 [Member] Effective July 18, 2016 [Member] Effective April 18, 2016 [Member] Effective April 18, 2016 [Member] Effective April 18, 2016 [Member] Effective October 18, 2016 [Member] Effective October 18, 2016 [Member] Effective October 18, 2016 [Member] Effective January 15, 2015 [Member] Effective January 15, 2015 [Member] Effective January 15, 2015 [Member] Effective December 18, 2015 [Member] Effective December 18, 2015 [Member] Effective December 18, 2015 [Member] Number of instruments held Derivative, Number of Instruments Held Cash flow hedges, notional amount Cash Flow Hedge Derivative Notional Amount Cash Flow Hedge Derivative Liability Notional Amount. Swaption interest rate Derivative, Swaption Interest Rate Term of contract Derivative, Term of Contract Segment Reporting [Abstract] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Insurance and Financial Services Segment [Member] Insurance and Financial Services Segment [Member] Insurance and Financial Services Segment [Member] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Number of business segments Number of Reportable Segments Number of Insurance Agency Offices Number of Insurance Agency Offices Number of Insurance Agency Offices Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Sfg Capital Trust I [Member] Sfg Capital Trust I [Member] SFG Capital Trust I [Member] Sfg Capital Trust Ii [Member] Sfg Capital Trust Ii [Member] SFG Capital Trust II [Member] Sfg Capital Trust Iii [Member] Sfg Capital Trust Iii [Member] SFG Capital Trust III [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] Number of Statutory Business Trusts Number of Statutory Business Trusts Number of Statutory Business Trusts Subordinated debentures owed to unconsolidated subsidiary trusts Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust Ownership percentage Equity Method Investment, Ownership Percentage Proceeds from issuance or sale of equity Proceeds from Issuance or Sale of Equity Net proceeds from issuance of common stock Payments to acquire investments Payments to Acquire Investments Trust preferred securities limited to tier one capital elements, Nnt of goodwill Trust Preferred Securities Limited To Tier One Capital Elements, Net Of Goodwill Trust preferred securities limited to tier one capital elements, net of goodwill. Parent [Member] Parent [Member] Intersegment Elimination [Member] Intersegment Eliminations [Member] Provision for loan losses Provision for Loan and Lease Losses Net interest income after provision for loan losses Interest Income (Expense), after Provision for Loan Loss Other income Noninterest Income Other expenses Noninterest Expense Income tax expense (benefit) Inter-segment revenue (expense) Intersegment revenue (expense) Intersegment Revenue Expense Average assets Average assets Average Assets. Schedule of Goodwill Schedule of Goodwill [Table Text Block] Summary Of Other Intangible Assets Summary Of Other Intangible Assets [Table Text Block] Schedule of Other Intangible Assets Allowance for Loan and Lease Losses, Adjustments, Net [Abstract] Schedule of Financing Receivable, Allowance for Credit Losses [Table] Schedule of Financing Receivable, Allowance for Credit Losses [Table] Receivable Type [Axis] Receivable Type [Axis] Receivable [Domain] Receivable [Domain] Land And Land Development [Member] Land And Land Development [Member] Land And Land Development [Member] Other Unallocated Financing Receivables [Member] Financing Receivable, Allowance for Credit Losses [Line Items] Financing Receivable, Allowance for Credit Losses [Line Items] Financing Receivable, Allowance for Credit Losses [Roll Forward] Financing Receivable, Allowance for Credit Losses [Roll Forward] Beginning balance Financing Receivable, Allowance for Credit Losses Charge-offs Financing Receivable, Allowance for Credit Losses, Write-downs Recoveries Financing Receivable, Allowance for Credit Losses, Recovery Provision Provision for Loan, Lease, and Other Losses Ending balance Allowance related to: Loans individually evaluated for impairment Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment Allowance related to: Loans collectively evaluated for impairment Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment Total Allowance Loans individually evaluated for impairment Financing Receivable, Individually Evaluated for Impairment Loans collectively evaluated for impairment Financing Receivable, Collectively Evaluated for Impairment Total Loans Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Domain] Property, Plant and Equipment, Type [Domain] Building [Member] Building [Member] Furniture and equipment [Member] Furniture And Equipment [Member] Furniture And Equipment [Member] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum [Member] Minimum [Member] Maximum [Member] Maximum [Member] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Useful life Property, Plant and Equipment, Useful Life Depreciation expense Depreciation Aggregate minimum annual rental commitments under operating leases in 2016 Operating Leases, Future Minimum Payments Receivable, Current Aggregate minimum annual rental commitments under operating leases in 2017 Operating Leases, Future Minimum Payments Receivable, in Two Years Net rent expense Operating Leases, Rent Expense, Net Number of causes of action Loss Contingency, Causes of Action, Number Loss Contingency, Causes of Action, Number Number of Defaults Financing Receivable, Modifications, Subsequent Default, Number of Contracts Recorded Investment at Default Date Financing Receivable, Modifications, Subsequent Default, Recorded Investment Preferred stock, dividends per share Preferred Stock, Dividends Per Share, Declared Number of common shares issued Stock Repurchased and Retired During Period, Shares Stock Repurchased and Retired During Period, Shares Common Stock, Dividends, Per Share, Declared Common Stock, Dividends, Per Share, Declared Purchase of unallocated common stock held by ESOP, number of shares Purchase of unallocated common stock held by ESOP, number of shares Purchase of unallocated common stock held by ESOP, number of shares Stock Issued During Period, Shares, Employee Stock Ownership Plan Stock Issued During Period, Shares, Employee Stock Ownership Plan Employee Stock Ownership Plan [Abstract] Employee Stock Ownership Plan [Abstract] Employee Stock Ownership Plan (ESOP), Number of Allocated Shares Employee Stock Ownership Plan (ESOP), Number of Allocated Shares Employee Stock Ownership Plan (ESOP), Number of Committed-to-be-Released Shares Employee Stock Ownership Plan (ESOP), Number of Committed-to-be-Released Shares Employee Stock Ownership Plan (ESOP), Number of Suspense Shares Employee Stock Ownership Plan (ESOP), Number of Suspense Shares Employee Stock Ownership Plan (ESOP), Shares in ESOP Employee Stock Ownership Plan (ESOP), Shares in ESOP Employee Stock Ownership Plan (ESOP), Deferred Shares, Fair Value Employee Stock Ownership Plan (ESOP), Deferred Shares, Fair Value Summary Of Interest Bearing Deposits By Type Summary Of Interest Bearing Deposits By Type [Table Text Block] Summary Of Interest Bearing Deposits By Type [Table Text Block] Summary Of Scheduled Maturities For All Time Deposits Summary Of Scheduled Maturities For All Time Deposits [Table Text Block] Scheduled of Maturities For All Time Deposits Summary Of Maturity Distribution Of All Certificates Of Deposit Summary Of Maturity Distribution Of All Certificates Of Deposit [Table Text Block] Summary Of Maturity Distribution Of All Certificates Of Deposit In Denominations Of One Hundred Thousand Dollars Or More. 2016 Time Deposit Maturities, Next Twelve Months 2017 Time Deposit Maturities, Year Two 2018 Time Deposit Maturities, Year Three 2019 Time Deposit Maturities, Year Four 2020 Time Deposit Maturities, Year Five Thereafter Time Deposit Maturities, after Year Five Total Time Deposits Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block] Income Statement [Abstract] Interest income Interest Income (Expense), Net [Abstract] Interest and fees on loans Interest and Fee Income, Loans and Leases [Abstract] Taxable Interest and Fee Income, Loans and Leases Tax-exempt Tax-exempt Tax-exempt interest and fees on loans. Interest and dividends on securities Interest and Dividend Income, Securities, by Taxable Status [Abstract] Taxable InterestAndDividendsOnSecuritiesTaxable Interest and dividends on securities, Taxable Tax-exempt InterestAndDividendsOnSecuritiesTaxExempt Interest and dividends on securities, tax-exempt Interest on interest bearing deposits with other banks Interest Income, Deposits with Financial Institutions Total interest income Interest expense Interest Expense [Abstract] Interest on deposits Interest Expense, Deposits Interest on short-term borrowings Interest Expense, Short-term Borrowings Interest on long-term borrowings and subordinated debentures Interest Expense, Long-term Debt Total interest expense Net interest income Other income Noninterest Income [Abstract] Insurance commissions Insurance Commissions and Fees Service fees related to deposit accounts Fees and Commissions, Depositor Accounts Realized securities gains Bank owned life insurance income Bank Owned Life Insurance Income Other Noninterest Income, Other Operating Income Total other-than-temporary impairment loss on securities Portion of loss recognized in other comprehensive income Total other income Other expense Noninterest Expense [Abstract] Salaries, commissions, and employee benefits Labor and Related Expense Net occupancy expense Occupancy, Net Equipment expense Equipment Expense Professional fees Professional Fees Amortization of intangibles Amortization of Intangible Assets FDIC premiums Federal Deposit Insurance Corporation Premium Expense Foreclosed properties expense Foreclosed Real Estate Expense (Gain) loss on sale of foreclosed properties GainLossOnSaleOfForeclosedProperties (Gain) loss on sale of foreclosed properties. Write-down of foreclosed properties Impairment of Real Estate Other Other Noninterest Expense Total other expense Loans and Leases Receivable, Related Parties [Roll Forward] Loans and Leases Receivable, Related Parties [Roll Forward] Balance, beginning Loans and Leases Receivable, Related Parties Additions Loans and Leases Receivable, Related Parties, Additions Amounts collected Loans and Leases Receivable, Related Parties, Collections Other changes, net Loans and Leases Receivable, Related Parties, Other Changes, Net Loans and Leases Receivable, Related Parties, Other Changes, Net Balance, ending Property Held For Sale Real Estate Owned [Text Block] Document And Entity Information Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Document Type Document Type Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Amendment Flag Amendment Flag Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Voluntary Filers Entity Current Reporting Status Entity Current Reporting Status Entity Public Float Entity Public Float Condensed Financial Statements [Table] Condensed Financial Statements [Table] Condensed Financial Statements, Captions [Line Items] Condensed Financial Statements, Captions [Line Items] Cash Cash Investment in subsidiaries, eliminated in consolidation Investment in subsidiaries, eliminated in consolidation Investment In Subsidiaries, Eliminated In Consolidation Securities available for sale Available-for-sale Securities Premises and equipment Property, Plant and Equipment, Net Other assets Other Assets Total assets Assets Long-term borrowings Other Long-term Debt Subordinated debentures Subordinated Debt Other liabilities Other Liabilities Total liabilities Liabilities Preferred stock and related surplus - authorized 250,000 shares; Series 2009, 8% Non-cumulative convertible preferred stock, par value $1.00; issued 2014 - 3,610 shares; 2013 - 3,710 shares and Series 2011, 8% Non-cumulative convertible preferred stock, par value $1.00; issued 2014 - 11,914; 2013 - 11,938 shares Preferred Stock, Value, Issued Common stock and related surplus, $2.50 par value; authorized 20,000,000 shares; issued 2015 - 10,671,744 shares; 2014 - 8,301,746 shares Common Stock, Value, Issued Unearned ESOP Shares Unearned ESOP Shares Retained earnings Retained Earnings (Accumulated Deficit) Accumulated other comprehensive income Accumulated Other Comprehensive Income (Loss), Net of Tax Total shareholders' equity Total liabilities and shareholders' equity Liabilities and Equity CASH FLOWS FROM OPERATING ACTIVITIES Net Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net earnings to net cash Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Equity in (undistributed) distributed net income of subsidiaries Equity in (undistributed) distributed net income of subsidiaries Equity In Undistributed Distributed Net Income Of Subsidiaries Deferred tax expense (benefit) Depreciation Other-than-temporary impairment of securities Realized securities gains Stock compensation expense Share-based Compensation (Increase) decrease in cash surrender value of bank owned life insurance Life Insurance, Corporate or Bank Owned, Change in Value (Increase) decrease in other assets Increase (Decrease) in Other Operating Assets Increase (decrease) in other liabilities Increase (Decrease) in Other Operating Liabilities Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities CASH FLOWS FROM INVESTING ACTIVITIES Net Cash Provided by (Used in) Investing Activities [Abstract] Proceeds from sales of securities available for sale Principal payments received on securities available for sale Purchase of available for sale securities Payments to Acquire Available-for-sale Securities Purchases of premises and equipment Payments to Acquire Property, Plant, and Equipment Net cash provided by (used in) investing activities Net Cash Provided by (Used in) Investing Activities CASH FLOWS FROM FINANCING ACTIVITIES Net Cash Provided by (Used in) Financing Activities [Abstract] Dividends paid on preferred stock Payments of Ordinary Dividends, Preferred Stock and Preference Stock Payments of Ordinary Dividends, Common Stock Payments of Ordinary Dividends, Common Stock Exercise of stock options Proceeds from Stock Options Exercised Proceeds from long-term borrowings Proceeds from Issuance of Long-term Debt Repayment of long-term borrowings Repayments of Long-term Debt Repayments of Subordinated Debt Repayments of Subordinated Debt Payments for Repurchase of Common Stock Payments for Repurchase of Common Stock Origination of Loans to Employee Stock Ownership Plans Origination of Loans to Employee Stock Ownership Plans Net cash provided by (used in) financing activities Net Cash Provided by (Used in) Financing Activities Increase (decrease) in cash Cash, Period Increase (Decrease) Cash, Beginning Balance Cash, Ending Balance Supplemental Disclosures of Cash Flow Information Supplemental Cash Flow Information [Abstract] Interest Interest Paid Schedule of Available-for-sale Securities [Table] Schedule of Available-for-sale Securities [Table] Major Types of Debt and Equity Securities [Axis] Major Types of Debt and Equity Securities [Axis] Major Types of Debt and Equity Securities [Domain] Major Types of Debt and Equity Securities [Domain] Residential Mortgage Backed Securities [Member] Residential Mortgage Backed Securities [Member] Schedule of Available-for-sale Securities [Line Items] Schedule of Available-for-sale Securities [Line Items] State and Political Subdivisions Securities, Number of States with Highest Volume State and Political Subdivisions Securities, Number of States with Highest Volume State and Political Subdivisions Securities, Number of States with Highest Volume Contractual maturity Available-for-sale Securities, Debt Maturities, Contractual Maturity, Term Available-for-sale Securities, Debt Maturities, Contractual Maturity, Term Estimated average life to maturity Available-for-sale Securities, Debt Maturities, Estimated Average Life Available-for-sale Securities, Debt Maturities, Estimated Average Life Securities pledged to secure public deposits and other purposes Security Owned and Pledged as Collateral, Fair Value Securities held with an unrealized loss position Securities held with an unrealized loss position Condensed Financial Statements of Parent Company Condensed Financial Information of Parent Company Only Disclosure [Text Block] Preferred Stock Preferred Stock [Text Block] Amount Effective Income Tax Rate Reconciliation, Amount [Abstract] Computed tax at applicable statutory rate Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount Tax-exempt interest and dividends, net Effective Income Tax Rate Reconciliation, Tax Exempt Income, Amount State income taxes, net of Federal income tax benefit Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount Other, net Effective Income Tax Rate Reconciliation, Other Adjustments, Amount Percent Effective Income Tax Rate Reconciliation, Percent [Abstract] Computed tax at applicable statutory rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Tax-exempt interest and dividends, net Effective Income Tax Rate Reconciliation, Tax Exempt Income, Percent State income taxes, net of Federal income tax benefit Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent Other, net Effective Income Tax Rate Reconciliation, Other Adjustments, Percent Applicable income taxes Effective Income Tax Rate Reconciliation, Percent Credit Facility [Axis] Credit Facility [Axis] Credit Facility [Domain] Credit Facility [Domain] Line of Credit [Member] Line of Credit [Member] Short-term Debt, Type [Axis] Short-term Debt, Type [Axis] Short-term Debt, Type [Domain] Short-term Debt, Type [Domain] Federal Reserve Bank Advances [Member] Federal Reserve Bank Advances [Member] Subsidiaries [Member] Subsidiaries [Member] Line of credit Line of Credit Facility, Maximum Borrowing Capacity Additional borrowings available from the FHLB Federal Home Loan Bank, Advances, General Debt Obligations, Maximum Amount Available Fair Value Measurements Fair Value Disclosures [Text Block] Options Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Outstanding Options, Beginning Balance Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Outstanding Options, Granted Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures Outstanding Options, Exercised Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Outstanding Options, Forfeited Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period Outstanding Options, Expired Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period Outstanding Options, Ending Balance Weighted- Average Exercise Price (WAEP) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Outstanding, Weighted-Average Exercise Price, Beginning Balance Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Outstanding, Weighted-Average Exercise Price, Granted Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Outstanding, Weighted-Average Exercise Price, Exercised Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Outstanding, Weighted-Average Exercise Price, Forfeited Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price Outstanding, Weighted-Average Exercise Price, Expired Share-based Compensation Arrangements by Share-based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price Outstanding, Weighted-Average Exercise Price, Ending Balance Exercisable Options, Ending Balance Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Exercisable Options, Weighted-Average Exercise Price, Ending Balance Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price Schedule of Components of Income Tax Expense (Benefit) Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Schedule of Effective Income Tax Rate Reconciliation Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Schedule of Deferred Tax Assets and Liabilities Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Common Stock Issuances Stockholders' Equity Note Disclosure [Text Block] Statement of Cash Flows [Abstract] Cash Flows from Operating Activities Stock compensation expense Deferred income tax expense Loans originated for sale Payments for Origination and Purchases of Loans Held-for-sale Proceeds from loans sold Proceeds from Sale of Loans Held-for-sale Securities losses Loss on disposal of assets Gain (Loss) on Disposition of Assets for Financial Service Operations Write down of foreclosed properties Amortization of securities premiums (accretion of discounts), net Accretion (Amortization) of Discounts and Premiums, Investments Amortization of goodwill and purchase accounting adjustments, net Amortization of goodwill and purchase accounting adjustments, net Amortization Of Goodwill And Purchase Accounting Adjustments, Net Decrease in accrued interest receivable Increase (Decrease) in Accrued Interest Receivable, Net Increase in cash surrender value of bank owned life insurance Increase (decrease) in other liabilities Cash Flows from Investing Activities Proceeds from maturities and calls of securities available for sale Purchases of securities available for sale Purchases of other investments PurchasesOfOtherInvestments Purchases of other investments. Redemption of Federal Home Loan Bank Stock Payments for (Proceeds from) Federal Home Loan Bank Stock Net principal payments received on loans Payments for (Proceeds from) Loans Receivable Proceeds from disposal of premises and equipment Proceeds from Sale of Property, Plant, and Equipment Proceeds from sales of other repossessed assets & property held for sale Proceeds from Sale of Foreclosed Assets Purchase of life insurance contracts Payments to Acquire Life Insurance Policies Cash Flows from Financing Activities Net increase in demand deposit, NOW and savings accounts Net increase in demand deposit, NOW and savings accounts Increase Decrease In Deposits Excluding Time Deposits Net decrease in time deposits Increase (Decrease) in Time Deposits Net increase in short-term borrowings Proceeds from (Repayments of) Short-term Debt Increase in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash and cash equivalents: Cash and Cash Equivalents, at Carrying Value [Abstract] Beginning Cash and Cash Equivalents, at Carrying Value Ending Cash payments for: Supplemental Cash Flow Elements [Abstract] Income taxes Income Taxes Paid Supplemental Schedule of Noncash Investing and Financing Activities Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Other assets acquired in settlement of loans Fair Value of Assets Acquired Earnings Per Share [Abstract] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Antidilutive Securities [Axis] Antidilutive Securities [Axis] Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Stock Appreciation Rights (SARs) [Member] Stock Appreciation Rights (SARs) [Member] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Allowance for Loan Losses Allowance for Credit Losses [Text Block] Land [Member] Land [Member] Building and improvements [Member] Building and Building Improvements [Member] Premises and equipment, gross Property, Plant and Equipment, Gross Less accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Total premises and equipment, net Loans Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Balance Sheets Condensed Balance Sheet [Table Text Block] Statements of Income Condensed Income Statement [Table Text Block] Statements of Cash Flows Condensed Cash Flow Statement [Table Text Block] Total Losses Total Recoveries Net losses Financing Receivable, Allowance for Credit Losses, Period Increase (Decrease) Provision for loan losses New Accounting Pronouncements and Changes in Accounting Principles [Abstract] Significant New Authoritative Accounting Guidance Significant Accounting Policies [Text Block] Statement of Financial Position [Abstract] Preferred stock, shares authorized Preferred Stock, Shares Authorized Preferred stock, par value Preferred stock, shares issued Preferred stock, dividend rate Common stock, par value Common Stock, Par or Stated Value Per Share Common stock, shares authorized Common Stock, Shares Authorized Common stock, shares outstanding Common Stock, Shares, Outstanding Regulatory Matters Regulatory Capital Requirements under Banking Regulations [Text Block] Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table] Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table] Exercise Price Range [Axis] Exercise Price Range [Axis] Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Domain] Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Domain] 2.54 to 6.00 [Member] Range Of Exercise Price Two Dollar And Fifty Four Cent To Six Dollar [Member] Range Of Exercise Price Two Dollar And Fifty Four Cent To Six Dollar [Member] 6.01 to 10.00 [Member] Range Of Exercise Price Six Dollar And One Cent To Ten Dollar [Member] Range Of Exercise Price Six Dollar And One Cent To Ten Dollar [Member] 10.01 to 17.50 [Member] Range Of Exercise Price Ten Dollar And One Cent To Seventeen Dollar And Fifty Cent [Member] Range Of Exercise Price Ten Dollar And One Cent To Seventeen Dollar And Fifty Cent [Member] 17.51 to 20.00 [Member] Range Of Exercise Price Seventeen Dollar And Fifty One Cent To Twenty Dollar [Member] Range Of Exercise Price Seventeen Dollar And Fifty One Cent To Twenty Dollar [Member] 20.01 to 25.93 [Member] Range Of Exercise Price Twenty Dollar And One Cent To Twenty Five Dollar And Ninety Three Cent [Member] Range Of Exercise Price Twenty Dollar And One Cent To Twenty Five Dollar And Ninety Three Cent [Member] Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] Range of exercise price, Lower Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit Range of exercise price, Upper Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit Options Outstanding, number of shares Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Outstanding Options Options Outstanding, WAEP Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Exercise Price Options Outstanding, Wted. Avg. Remaining Contractual Life (yrs) Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Remaining Contractual Term Options Outstanding, Aggregate Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Options, Exercisable, number of shares Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Exercisable Options Options Exercisable, WAEP Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Exercisable Options, Weighted Average Exercise Price Options Exercisable, Aggregate Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value U.S. Government and agencies and corporations [Member] US Government Corporations and Agencies Securities [Member] Government-sponsored agencies [Member] Government Sponsored Agencies [Member] Government Sponsored Agencies [Member] Nongovernment-sponsored entities [Member] Nongovernment Sponsored Agencies [Member] Non Owner Occupied [Member] State and political subdivisions [Member] US States and Political Subdivisions Debt Securities [Member] Corporate debt securities [Member] Corporate Debt Securities [Member] Other equity securities [Member] Equity Securities [Member] Tax-exempt state and political subdivisions [Member] Tax Exempt Debt Securities Us States And Political Subdivisions [Member] Tax Exempt Debt Securities Residential Mortgage Backed Securities [Member] Available for sale securities, fair value Interest rate swap Interest rate swap Interest rate swap. Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Table] Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Table] Award Type [Axis] Award Type [Axis] Equity Award [Domain] Equity Award [Domain] Employee Stock Ownership Plan (ESOP) Name [Axis] Employee Stock Ownership Plan (ESOP) Name [Axis] Employee Stock Ownership Plan (ESOP), Plan [Domain] Employee Stock Ownership Plan (ESOP), Plan [Domain] Summit Financial Group Inc. Employee Stock Ownership Plan [Member] Summit Financial Group Inc. Employee Stock Ownership Plan [Member] Summit Financial Group Inc. Employee Stock Ownership Plan [Member] Plan Name [Axis] Plan Name [Axis] Plan Name [Domain] Plan Name [Domain] 2014 LTIP [Member] 2014 Long-Term Incentive Plan [Member] 2014 Long-Term Incentive Plan [Member] Defined Benefit Plans and Other Postretirement Benefit Plans [Axis] Defined Benefit Plans and Other Postretirement Benefit Plans [Axis] Defined Benefit Plan and Other Postretirement Benefit Plan [Domain] Defined Benefit Plan and Other Postretirement Benefit Plan [Domain] Supplemental Employee Retirement Plan [Member] Supplemental Employee Retirement Plan [Member] Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] Contributions to the plans Defined Contribution Plan, Employer Discretionary Contribution Amount Contributions to the ESOP Employee Stock Ownership Plan (ESOP), Cash Contributions to ESOP Shares owned by ESOP Employee Stock Ownership Plan (ESOP), Weighted Average Purchase Price of Shares Purchased Employee Stock Ownership Plan (ESOP), Weighted Average Purchase Price of Shares Purchased Employee Stock Ownership Plan (ESOP), Debt Structure, Indirect Loan, Amount Employee Stock Ownership Plan (ESOP), Debt Structure, Indirect Loan, Amount Accrued liabilities Defined Benefit Pension Plan, Liabilities Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Schedule of Short-term Debt Schedule of Short-term Debt [Table Text Block] Schedule of Long-term Debt Instruments Schedule of Long-term Debt Instruments [Table Text Block] Schedule of Maturities of Long-term Debt Schedule of Maturities of Long-term Debt [Table Text Block] Goodwill and Other Intangible Assets Goodwill and Intangible Assets Disclosure [Text Block] Threshold Period for Ordering Appraisal on Impaired Loans, Length of Existing Appraisal Threshold Period for Ordering Appraisal on Impaired Loans, Length of Existing Appraisal Threshold Period for Ordering Appraisal on Impaired Loans, Length of Existing Appraisal Discount to sell collateral Collateralized Financings, Discount to Sell Collateral Collateralized Financings, Discount to Sell Collateral Length of Time Generally Receive New Appraisal Post Impairment Length of Time Generally Receive New Appraisal Post Impairment Length of Time Generally Receive New Appraisal Post Impairment Length of Time Generally Receive New Appraisal on Foreclosed Properties Length of Time Generally Receive New Appraisal on Foreclosed Properties Length of Time Generally Receive New Appraisal on Foreclosed Properties Schedule of Earnings Per Share, Basic and Diluted Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Schedule of Credit Losses Related to Financing Receivables, Current and Noncurrent Schedule of Credit Losses Related to Financing Receivables, Current and Noncurrent [Table Text Block] Allowance for Credit Losses on Financing Receivables Allowance for Credit Losses on Financing Receivables [Table Text Block] TotalUnfundedOrOffBalanceSheetCreditExtensionCommitmentsTable [Table] TotalUnfundedOrOffBalanceSheetCreditExtensionCommitmentsTable [Table] Total Unfunded Or Off Balance Sheet Credit Extension Commitments [Table] Total Unfunded Or Off Balance Sheet Credit Extension Commitments [Axis] Total Unfunded Or Off Balance Sheet Credit Extension Commitments [Axis] Total Unfunded Or Off Balance Sheet Credit Extension Commitments [Axis] TotalUnfundedOrOffBalanceSheetCreditExtensionCommitments [Domain] TotalUnfundedOrOffBalanceSheetCreditExtensionCommitments [Domain] Total Unfunded Or Off Balance Sheet Credit Extension Commitments [Domain] Revolving home equity and credit card lines [Member] Revolving Home Equity And Credit Card Lines [Member] Revolving Home Equity And Credit Card Lines [Member] Construction loans [Member] Other loans [Member] Standby letters of credit [Member] Standby Letters of Credit [Member] Loss Contingencies [Line Items] Loss Contingencies [Line Items] Total unfunded commitments Total unfunded commitments Total Unfunded Commitments. Schedule of Quarterly Financial Information [Table Text Block] Schedule of Quarterly Financial Information [Table Text Block] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Schedule of Earnings Per Share, Basic, by Common Class, Including Two Class Method [Table] Schedule of Earnings Per Share, Basic, by Common Class, Including Two Class Method [Table] Earnings Per Share [Line Items] Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] Less preferred stock dividends Basic EPS, Common Shares (Denominator) (in shares) Weighted Average Number of Shares Outstanding, Basic Basic EPS (in dollars per share) Diluted EPS, Stock options, Common Shares (Denominator) (in shares) Weighted Average Number Diluted Shares Outstanding Adjustment Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Diluted EPS, convertible preferred stock dividend, Income (Numerator) Diluted EPS, convertible preferred stock dividend, Income (Numerator) Convertible Preferred Dividends Diluted EPS, convertible preferred stock, Common Shares (Denominator) (in shares) Incremental Common Shares Attributable to Dilutive Effect of Conversion of Preferred Stock Diluted EPS, Income (Numerator) Net Income (Loss) Available to Common Stockholders, Diluted Diluted EPS, Common Shares (Denominator) (in shares) Weighted Average Number of Shares Outstanding, Diluted Diluted EPS (in dollars per share) Threshold Period Past Due for Loans to be Default Threshold Period Past Due for Loans to be Default Threshold Period Past Due for Loans to be Default Residential real estate loan threshold for jumbo loans Residential Real Estate Loan Threshold For Jumbo Loan Qualification Residential Real Estate Loan Threshold For Jumbo Loan Qualification Threshold period past due for nonaccrual status of financing receivable Threshold Period Past Due for Nonaccrual Status of Financing Receivable Threshold Period Past Due for Nonaccrual Status of Financing Receivable Threshold period past due for write-off of credit card loans Threshold Period Past Due for Writeoff of Credit Card Loans Threshold Period Past Due for Writeoff of Credit Card Loans Threshold period special event notification for writeoff of financing receivable Threshold Period Special Event Notification For Writeoff Of Financing Receivable Threshold Period Special Event Notification For Writeoff Of Financing Receivable Threshold period past due for writeoff of residential mortgage loans Threshold Period Past Due for Writeoff of Residential Mortgage Loans Threshold Period Past Due for Writeoff of Residential Mortgage Loans Threshold period for writeoff of collateralized consumer loans Threshold Period for Writeoff Of Collateralized Consumer Loans Threshold Period for Writeoff Of Collateralized Consumer Loans Risk rate loans, aggregate balance threshold Risk Rate Loans, Aggregate Balance Threshold Risk Rate Loans, Aggregate Balance Threshold Risk rate loans, loan balance threshold Risk Rate Loans, Loan Balance Threshold Risk Rate Loans, Loan Balance Threshold Average impaired balance Interest income recognized while impaired Troubled debt restructurings included in impaired loans Financing Receivable, Modifications, Recorded Investment Current Troubled debt restructurings included in impaired loans Current Troubled debt restructurings included in impaired loans Custom Element. Troubled debt restructuring, aggregate exposure Non-Homogenous Commercial Loan Relationship, Annual Loan Review, Threshold Non-Homogenous Commercial Loan Relationship, Annual Loan Review, Threshold Threshold for related party loans Loans and Leases Receivable, Related Parties, Aggregate Threshold Loans and Leases Receivable, Related Parties, Aggregate Threshold Debt Security Category [Axis] Debt Security Category [Axis] Other than Temporary impairment, Credit Losses Recognized in Earnings, Categories of Investments [Domain] Other than Temporary Impairment, Credit Losses Recognized in Earnings, Categories of Investments [Domain] Temporarily Impaired Securities Member Temporarily Impaired Securities Member Temporarily Impaired Securities [Member] Other Than Temporarily Impaired Securities [Member] Other Than Temporarily Impaired Securities [Member] Other Than Temporarily Impaired Securities [Member] State and political subdivisions, General obligations [Member] State and Political Subdivisions General Obligations [Member] State And Political Subdivisions General Obligations. State and political subdivisions, Water and sewer revenues [Member] State and Political Subdivisions Water and Sewer Revenues [Member] State And Political Subdivisions Water And Sewer Revenues. State and political subdivisions, Other revenues [Member] State and Political Subdivisions Other Revenues [Member] State And Political Subdivisions Other Revenues. Tax Exempt State and Political Subdivisions General Obligations [Member] Tax Exempt State and Political Subdivisions General Obligations [Member] Custom Element. Tax Exempt State and Political Subdivisions Water and Sewer Revenues [Member] Tax Exempt State and Political Subdivisions Water and Sewer Revenues [Member] Custom Element. Tax Exempt State and Political Subdivisions Lease Revenues [Member] Tax Exempt State and Political Subdivisions Lease Revenues [Member] Custom Element. Tax Exempt State and Political Subdivisions Lottery/casino Revenues [Member] Tax Exempt State and Political Subdivisions Lottery/casino Revenues [Member] Custom Element. Tax Exempt State and Political Subdivisions Other Revenues [Member] Tax Exempt State and Political Subdivisions Other Revenues [Member] Custom Element. Less than 12 months, Estimated Fair Value Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value Less than 12 months, Unrealized Loss Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 12 months or more, Estimated Fair Value Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 12 months or more, Unrealized Loss Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Total Estimated Fair Value Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value Total Unrealized Loss Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss Segment Information Segment Reporting Disclosure [Text Block] Schedule of Short-term Debt [Table] Schedule of Short-term Debt [Table] Short-term FHLB Advances [Member] Federal Home Loan Bank Advances [Member] Federal Funds Purchased and Lines of Credit [Member] Federal Funds Purchased And Lines Of Credit [Member] Federal Funds Purchased And Lines Of Credit [Member] Balance at December 31 Short-term Debt Average balance outstanding for the period Short-term Debt, Average Outstanding Amount Maximum balance outstanding at any month end during period Short-term Debt, Maximum Month-end Outstanding Amount Weighted average interest rate for the period Weighted average interest rate for the period Weighted average interest rate. Weighted average interest rate for balances outstanding Short-term Debt, Weighted Average Interest Rate Borrowing availability through credit lines and Federal funds purchased agreements Borrowing availability through credit lines and Federal funds purchased agreements Schedule of Segment Reporting Information, by Segment Schedule of Segment Reporting Information, by Segment [Table Text Block] Number of distinct reserve components Number of Reserve Components Number of Reserve Components Aggregate balance threshold for evaluating individual loans Loans and Lease Losses, Aggregate Balance Threshold for Evaluating Individual Loans Loans and Lease Losses, Aggregate Balance Threshold for Evaluating Individual Loans Period for re-evaluation of fair value for collateral dependent loans Allowance for Loan and Lease Losses, Re-Evaluation of Fair Value for Collateral Dependent Loans, Term Allowance for Loan and Lease Losses, Re-Evaluation of Fair Value for Collateral Dependent Loans, Term Number of loan pools for stratification Loan and Lease Losses, Number of Loan Pools for Stratification Loan and Lease Losses, Number of Loan Pools for Stratification Allocation of loan pool's average 12-month historical net loan charge-off Loan and Lease Losses, Loan Pool Average Twelve Month Historical Net Loan Charge-Off, Allocation, Percentage Loan and Lease Losses, Loan Pool Average Twelve Month Historical Net Loan Charge-Off, Allocation, Percentage Premises and Equipment Property, Plant and Equipment Disclosure [Text Block] ASSETS Assets [Abstract] Cash and due from banks Cash and Due from Banks Interest bearing deposits with other banks Interest-bearing Deposits in Banks and Other Financial Institutions Cash and cash equivalents Other investments Other Investments Loans held for sale, net Disposal Group, Including Discontinued Operation, Loans Receivable, Net Loans, net Loans and Leases Receivable, Net Amount Property held for sale Premises and equipment, net Accrued interest receivable Interest Receivable Intangible assets Intangible Assets, Net (Including Goodwill) Cash surrender value of life insurance policies Bank Owned Life Insurance LIABILITIES AND SHAREHOLDERS' EQUITY Liabilities and Equity [Abstract] Liabilities Liabilities [Abstract] Deposits Non interest bearing Noninterest-bearing Deposit Liabilities Interest bearing Interest-bearing Deposit Liabilities Total deposits Deposits Short-term borrowings Shareholders' Equity Stockholders' Equity Attributable to Parent [Abstract] Preferred stock and related surplus - authorized 250,000 shares; Series 2009, 8% Non-cumulative convertible preferred stock, par value $1.00; issued 2014 - 3,610 shares; 2013 - 3,710 shares and Series 2011, 8% Non-cumulative convertible preferred stock, par value $1.00; issued 2014 - 11,914; 2013 - 11,938 shares Total shareholders' equity Organization, Consolidation and Presentation of Financial Statements [Abstract] Use of estimates Use of Estimates, Policy [Policy Text Block] Principles of consolidation Consolidation, Policy [Policy Text Block] Variable interest entities Consolidation, Variable Interest Entity, Policy [Policy Text Block] Cash and cash equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Presentation of cash flows Presentation Of Cash Flows Presentation Of Cash Flows Policy [Policy Text Block] Advertising Advertising Cost, Policy, Expensed Advertising Cost [Policy Text Block] Trust services Trust Services [Policy Text Block] Trust Services Policy [Policy Text Block] Reclassifications Reclassification, Policy [Policy Text Block] Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Measurement Basis [Axis] Measurement Basis [Axis] Fair Value Measurement [Domain] Fair Value Measurement [Domain] Portion at Fair Value Measurement [Member] Portion at Fair Value Measurement [Member] Carrying Value [Member] Reported Value Measurement [Member] Estimated Fair Value [Member] Estimate of Fair Value Measurement [Member] Cash and cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Securities available for sale AvailableForSaleSecuritiesFairValueDisclosure1 Available For Sale Securities Fair Value Disclosure 1. Other investments Other Assets, Fair Value Disclosure Loans held for sale, net Loans, net Loans Receivable, Fair Value Disclosure Accrued interest receivable AccruedInterestReceivableFairValueDisclosure Accrued Interest Receivable Fair Value Disclosure Total assets Assets, Fair Value Disclosure Deposits Deposits, Fair Value Disclosure Short-term borrowings Short-term Debt, Fair Value Long-term borrowings Long-term Debt, Fair Value Subordinated debentures FairValueLiabilitiesMeasuredOnNonRecurringBasisSubordinatedDebtObligations Subordinated Debt Obligations, Fair Value Disclosure Subordinated debentures owed to unconsolidated subsidiary trusts SubordinatedDebenturesOwedToUnconsolidatedSubsidiaryTrustsFairValueDisclosure Subordinated Debentures Owed To Unconsolidated Subsidiary Trusts Fair Value Disclosure Accrued interest payable Accrued interest payable Accrued Interest Payable Fair Value Disclosure Derivative financial liabilities Derivative Liability Total liabilities Financial and Nonfinancial Liabilities, Fair Value Disclosure Schedule Of Activity Of Property Held For Sale Schedule Of Activity Of Property Held For Sale Schedule Of Other Real Estate Owned And Foreclosed Assets [Table Text Block] Other comprehensive income (loss): Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] Net unrealized gain (loss) on cashflow hedge of ($3,714) and 803, net of deferred taxes of ($1,374) and $297 for the years ended December 31, 2014 and 2013, respectfully Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax Non-credit related other-than-temporary impairment on available for sale debt securities $0, $37, and $857, net of deferred taxes of $0, $14, and $326 for the years ended December 31, 2014, 2013, and 2012, respectfully Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Loss, Net of Tax, Portion Attributable to Parent, Available-for-sale Securities Net unrealized gain (loss) on available for sale debt securities of $7,037, $(8,527), and $2,550, net of deferred taxes of $2,604, ($3,155), and $969 and reclassification adjustment for net realized gains included in net income of $213, $240, and $213, for the years ended December 31, 2014, 2013, and 2012, respectfully Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax Related And Unrelated Parties [Axis] Related And Unrelated Parties [Axis] Related And Unrelated Parties [Axis] Related and Unrelated Parties [Domain] Related and Unrelated Parties [Domain] Related and Unrelated Parties [Domain] Director [Member] Director [Member] Unrelated Party One [Member] Unrelated Party One [Member] Unrelated Party One [Member] Unrelated Party Two [Member] Unrelated Party Two [Member] Unrelated Party Two [Member] Tier 2 capital Subordinated Debt Qualifies As Tier Two Capital Under Federal Reserve Board Guidelines, Debt Maturity Date Subordinated debt qualifies as tier two capital under federal reserve board guidelines, debt maturity Tier 2 capital decrease each year until maturity Subordinated Debt Amount Qualifying As Tier Two Capital Reduced By Percent Each Year Until Maturity Subordinated debt amount qualifying as tier two capital reduced by percent each year until maturity. Number of unrelated parties Number of Unrelated Parties Number of Unrelated Parties Number of issuances Subordinated Debt, Number of Issuances Subordinated Debt, Number of Issuances Interest rate Subordinated Borrowing, Interest Rate Number of years subordinated borrowing is not pre-payable Subordinated Borrowing, Not Pre-Payable Within Number Of Years Subordinated borrowing, not pre-payable within number of years. Term of subordinated borrowing Subordinated Borrowing, Term Subordinated borrowing, term Prepaid subordinated debt Early Repayment of Subordinated Debt Amount Available for Dividend Distribution without Affecting Capital Adequacy Requirements Amount Available for Dividend Distribution without Affecting Capital Adequacy Requirements Required reserve balance Required reserve balance Required Reserve Balance With Federal Reserve Bank ILLINOIS ILLINOIS TEXAS TEXAS West Virginia [Member] West Virginia [Member] West Virginia. Ohio [Member] Ohio [Member] Ohio [Member] CALIFORNIA CALIFORNIA Total Amortized Cost Available for sale securities, Unrealized Gains Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax Available for sale securities, Unrealized Losses Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax Available for sale securities, Estimated Fair Value Basis of Presentation Basis of Presentation and Significant Accounting Policies [Text Block] Net unrealized gain (loss) on cashflow hedge Net unrealized (loss) on cashflow hedge Cash flow Hedge Net unrealized gain (loss) on cashflow hedge, deferred taxes Net unrealized (loss) on cashflow hedge, deferred tax Net unrealized (loss) on cashflow hedge, deferred tax. Non-credit related other-than-temporary impairment on available for sale debt securities, deferred taxes Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Income Loss, Tax, Including Portion Attributable to Noncontrolling Interest, Available-for-sale Securities Net unrealized gain (loss) on available for sale debt securities Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, before Tax Net unrealized gain (loss) on available for sale debt securities, deferred taxes Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax Reclassification adjustment for net realized gains included in net income Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax Schedule of Financing Receivable, Troubled Debt Restructurings [Table] Schedule of Financing Receivable, Troubled Debt Restructurings [Table] Financing Receivable, Modifications [Line Items] Financing Receivable, Modifications [Line Items] Number of Modifications Financing Receivable, Modifications, Number of Contracts Pre-modification Recorded Investment Financing Receivable, Modifications, Pre-Modification Recorded Investment Post-modification Recorded Investment Financing Receivable, Modifications, Post-Modification Recorded Investment Unidentifiable intangible assets, net carrying amount Finite-lived intangible assets, net Amortization expense Annual amortization, 2016 Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months Annual amortization, 2017 Finite-Lived Intangible Assets, Amortization Expense, Year Two Annual amortization, 2018 Finite-Lived Intangible Assets, Amortization Expense, Year Three Annual amortization, 2019 Finite-Lived Intangible Assets, Amortization Expense, Year Four Annual amortization, 2020 Finite-Lived Intangible Assets, Amortization Expense, Year Five Long-term FHLB advances Long-term Federal Home Loan Bank Advances Long-term reverse repurchase agreements Long-term reverse repurchase agreements Long-term reverse repurchase agreements Term loans Other Loans Payable, Long-term, Noncurrent Earnings Per Share Earnings Per Share [Text Block] Income Taxes Income Tax Disclosure [Text Block] State and political subdivisions, General obligations [Member] State and policital subdivisions, Water and sewer revenues [Member] State and Policital Subdivisions Water and Sewer Revenues [Member] Water And Sewer Revenues. State and policital subdivisions, Other revenues [Member] State and Policital Subdivisions Other Revenues [Member] Other Revenues. Total taxable debt securities [Member] Taxable Debt Securities [Member] Tax Exempt Mortgage Backed Securities [Member] State and political subdivisions, Lease revenues [Member] State and Political Subdivisions Lease Revenues [Member] State And Political Subdivisions Lease Revenues. State and political subdivisions, Lottery/casino revenues [Member] State and Political Subdivisions Lottery/casino Revenues [Member] State And Political Subdivisions Lottery Casino Revenues. State and Political Subdivisions Special Tax Revenues [Member] State and Political Subdivisions Special Tax Revenues [Member] State and Political Subdivisions Special Tax Revenues [Member] Total tax-exempt debt securities [Member] Tax Exempt Debt Securities [Member] Tax-Exempt Equity securities [Member] Home Equity Line of Credit [Member] Troubled Debt Restructurings [Roll Forward] Troubled debt restructurings, beginning balance TroubledDebtRestructuringsValue Troubled debt restructurings Additions Additions Additions. Charge-offs Charge-offs Charge-offs. Net (paydowns) advances Net (paydowns) advances Net (paydowns) advances Transfer into OREO Transfer into OREO Transfer into OREO. Refinance out of TDR status Refinance out of TDR status Refinance out of TDR status. Troubled debt restructurings, ending balance Allowance related to troubled debt restructurings Allowance related to troubled debt restructurings Allowance related to troubled debt restructurings. Demand deposits, interest bearing Demand Deposit Accounts Savings deposits Deposits, Savings Deposits Time deposits Total