Stockholders' Equity Attributable to Parent [Abstract] Schedule of Stock by Class [Table] Schedule of Stock by Class [Table] Acquisitions Business Acquisition [Axis] Acquiree Business Acquisition, Acquiree [Domain] Midwest Bancshares, Inc. [Member] Midwest Bancshares, Inc. [Member] Midwest Bancshares, Inc. [Member] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Treasury Stock Treasury Stock [Member] Award Type [Axis] Award Type [Axis] Award Type Equity Award [Domain] Stock Options Employee Stock Option [Member] Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Common Stock Common Stock [Member] Class of Stock [Line Items] Class of Stock [Line Items] Increase (Decrease) in Stock by Class [Roll Forward] Increase (Decrease) in Stock by Class [Roll Forward] Increase (Decrease) in Stock by Class [Roll Forward] Common stock, beginning of period Common Stock, Shares, Issued Treasury stock, beginning of period Treasury Stock, Shares Changes related to stock-based compensation awards: Changes Related to Stock-based Compensation Awards [Abstract] Changes Related to Stock-based Compensation Awards [Abstract] Release of restricted shares Common Stock, Released From Restrictions Due to Expiration Common Stock, Released From Restrictions Due to Expiration Release of restricted shares Treasury Stock, Released From Restrictions Due to Expiration Treasury Stock, Released From Restrictions Due to Expiration Treasury Stock, Value Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures Changes related to deferred compensation plan for Boards of Directors: Changes Related to Deferred Compensation Plan [Abstract] Changes Related to Deferred Compensation Plan [Abstract] Purchase of treasury stock Treasury Stock, Shares, Acquired Reissuance of treasury stock Stock Issued During Period, Shares, Treasury Stock Reissued Shares issued under dividend reinvestment plan Stock Issued During Period, Shares, Dividend Reinvestment Plan Common shares issued under compensation plan for Board of Directors Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period Common stock, end of period Treasury stock, end of period Stock Issued During Period, Shares, Acquisitions Stock Issued During Period, Shares, Acquisitions Investments [Abstract] Schedule of Held-to-maturity Securities [Table] Schedule of Held-to-maturity Securities [Table] Debt Security [Axis] Debt Security [Axis] Major Types of Debt Securities [Domain] Major Types of Debt Securities [Domain] States and political subdivisions US States and Political Subdivisions Debt Securities [Member] Residential mortgage-backed securities Residential Mortgage Backed Securities [Member] Commercial mortgage-backed securities Commercial Mortgage Backed Securities [Member] Schedule of Held-to-maturity Securities [Line Items] Schedule of Held-to-maturity Securities [Line Items] Debt securities, maturing within 1 year, amortized cost Held-to-maturity Securities, Debt Maturities, Next Rolling Twelve Months, Amortized Cost before Other than Temporary Impairment Held-to-maturity Securities, Debt Maturities, Next Rolling Twelve Months, Amortized Cost before Other than Temporary Impairment Debt securities, maturing 1 to 5 years, amortized cost Held-to-maturity Securities, Debt Maturities, Rolling Year Two Through Five, Amortized Cost before Other than Temporary Impairment Held-to-maturity Securities, Debt Maturities, Rolling Year Two Through Five, Amortized Cost before Other than Temporary Impairment Debt securities, maturing 5 to 10 years, amortized cost Held-to-maturity Securities, Debt Maturities, Rolling Year Six Through Ten, Amortized Cost before Other than Temporary Impairment Held-to-maturity Securities, Debt Maturities, Rolling Year Six Through Ten, Amortized Cost before Other than Temporary Impairment Debt securities, maturing over 10 years, amortized cost Held-to-maturity Securities, Debt Maturities, Rolling after Ten Years, Amortized Cost before Other than Temporary Impairment Held-to-maturity Securities, Debt Maturities, Rolling after Ten Years, Amortized Cost before Other than Temporary Impairment Debt securities, total amortized cost Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment Debt securities, maturing within 1 year, fair value Held-to-maturity Securities, Debt Maturities, Next Rolling Twelve Months, Fair Value Debt securities, maturing 1 to 5 years, fair value Held-to-maturity Securities, Debt Maturities, Rolling Year Two Through Five, Fair Value Debt securities, maturing 5 to 10 years, fair value Held-to-maturity Securities, Debt Maturities, Rolling Year Six Through Ten, Fair Value Debt securities, maturing over 10 years, fair value Held-to-maturity Securities, Debt Maturities, Rolling after Ten Years, Fair Value Fair Value Held-to-maturity Securities, Fair Value Held-to-maturity securities, maturing within 1 year, average yield Held-to-maturity Securities, Debt Maturities, Next Rolling Twelve Months, Average Yield Held-to-maturity Securities, Debt Maturities, Next Rolling Twelve Months, Average Yield Held-to-maturity securities, maturing 1 to 5 years, average yield Held-to-maturity Securities, Debt Maturities, Rolling Year Two Through Five, Average Yield Held-to-maturity Securities, Debt Maturities, Rolling Year Two Through Five, Average Yield Held-to-maturity securities, maturing 6 to 10 years, average yield Held-to-maturity Securities, Debt Maturities, Rolling Year Six Through Ten, Average Yield Held-to-maturity Securities, Debt Maturities, Rolling Year Six Through Ten, Average Yield Held-to-maturity securities, maturing over 10 years, average yield Held-to-maturity Securities, Debt Maturities, Rolling after Ten Years, Average Yield Held-to-maturity Securities, Debt Maturities, Rolling after Ten Years, Average Yield Held-to-maturity securities, total average yield Held-to-maturity Securities, Debt Maturities, Average Yield Held-to-maturity Securities, Debt Maturities, Average Yield Receivables [Abstract] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Receivable Type [Axis] Receivable Type [Axis] Receivable Type [Domain] Receivable [Domain] Commercial real estate, construction Commercial Real Estate Construction Financing Receivable [Member] Commercial real estate, other Commercial Real Estate Other Receivable [Member] Commercial real estate Commercial Real Estate [Member] Commercial and industrial Commercial Loan [Member] Residential real estate Residential Mortgage [Member] Home equity lines of credit Home Equity Line of Credit [Member] Consumer Consumer Loan [Member] Deposit account overdrafts Bank Overdrafts [Member] Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] 30 - 59 days Financing Receivable, Recorded Investment, 30 to 59 Days Past Due 60 - 89 days Financing Receivable, Recorded Investment, 60 to 89 Days Past Due 90 Days Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due Total Financing Receivable, Recorded Investment, Past Due Current Loans Financing Receivable, Recorded Investment, Current Total loans Loans and Leases Receivable, Net Amount Total Loans Loans and Leases Receivable, Net of Deferred Income Stockholders' Equity [Text Block] Stockholders' Equity Note Disclosure [Text Block] Statement of Comprehensive Income [Abstract] Net income Net Income (Loss) Attributable to Parent Other comprehensive income (loss): Other Comprehensive Income (Loss), Net of Tax [Abstract] Available-for-sale investment securities: Available-for-sale Securities [Abstract] Gross unrealized holding gain (loss) arising in the period Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, before Tax Related tax (expense) benefit Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax Less: reclassification adjustment for net gain included in net income Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax Related tax expense Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax Net effect on other comprehensive income (loss) Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax Defined benefit plans: Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract] Net loss arising during the period Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, before Tax Related tax benefit Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Tax Amortization of unrecognized loss and service cost on benefit plans Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Reclassification Adjustments and Tax Related tax expense Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, before Reclassification Adjustments, Tax Recognition of loss due to settlement and curtailment Other Comprehensive Income (Loss), Finalization of Pension and Other Postretirement Benefit Plan Valuation, before Tax Related tax expense Other Comprehensive Income (Loss), Finalization of Pension and Other Postretirement Benefit Plan Valuation, Tax Net effect on other comprehensive income (loss) Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax Total other comprehensive income (loss), net of tax Other Comprehensive Income (Loss), Net of Tax Total comprehensive income (loss) Comprehensive Income (Loss), Net of Tax, Attributable to Parent Business Combinations [Abstract] Finite-Lived Intangible Assets Acquired as Part of Business Combination [Table] Finite-Lived Intangible Assets Acquired as Part of Business Combination [Table] Goodwill and Intangibles Segments [Axis] Goodwill and Intangibles Segments [Domain] Intangible Assets Finite-Lived Intangible Assets by Major Class [Axis] Intangible Assets Finite-Lived Intangible Assets, Major Class Name [Domain] Core Deposits [Member] Core Deposits [Member] Customer Relationships [Member] Customer Relationships [Member] Other Intangible Assets [Member] Other Intangible Assets [Member] Servicing Contracts [Member] Servicing Contracts [Member] Intangible Assets Acquired Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets, Gross Finite-Lived Intangible Assets, Gross Other intangible assets Intangible Assets, Net (Excluding Goodwill) Finite-Lived Intangible Assets, Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Income Statement [Abstract] Interest Income: Interest Income [Abstract] Interest Income [Abstract] Interest and fees on loans Interest and Fee Income, Loans and Leases Interest and dividends on taxable investment securities Interest Income, Securities, Operating, Taxable Interest on tax-exempt investment securities Interest Income, Securities, Operating, Tax Exempt Other interest income Other Interest and Dividend Income Total interest income Interest and Dividend Income, Operating 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 Interest Expense, Long-term Debt and Capital Securities Total interest expense Interest Expense Net interest income Interest Income (Expense), Net Provision for (recovery of) loan losses Provision for Loan, Lease, and Other Losses Net interest income after provision for (recovery of) loan losses Interest Income (Expense), after Provision for Loan Loss Other Income: Noninterest Income, Other [Abstract] Insurance income Insurance Commissions and Fees Deposit account service charges Deposit account service charges Deposit account service charges Trust and investment income Investment Income, Interest Electronic banking income Electronic banking income Electronic banking income Mortgage banking income Fees and Commissions, Mortgage Banking Net gain on investment securities Gain (Loss) on Sale of Securities, Net Net loss on asset disposals and other transactions Gain (Loss) on Disposition of Assets for Financial Service Operations Other non-interest income Noninterest Income Total other income Other Income Other Expenses: Other Expenses [Abstract] Salaries and employee benefit costs Labor and Related Expense Net occupancy and equipment Occupancy, Net Professional fees Professional Fees Electronic banking expense Electronic banking expense Electronic banking expense includes bankcard and internet-based banking costs. Marketing expense Marketing and Advertising Expense Data processing and software Information Technology and Data Processing Franchise tax Taxes, Other Communication expense Communication FDIC insurance Federal Deposit Insurance Corporation Premium Expense Foreclosed real estate and other loan expenses Foreclosed Real Estate Expense Amortization of other intangible assets Other Depreciation and Amortization Other non-interest expense Other Noninterest Expense Total other expenses Noninterest Expense Income before income taxes Operating Income (Loss) Income tax expense Income Tax Expense (Benefit) Net income Earnings per share - basic Earnings Per Share, Basic Earnings per share - diluted Earnings Per Share, Diluted Weighted-average number of shares outstanding - basic Weighted Average Number of Shares Outstanding, Basic Weighted-average number of shares outstanding - diluted Weighted Average Number of Shares Outstanding, Diluted Cash dividends declared Dividends, Common Stock, Cash Cash dividends declared per share Common Stock, Dividends, Per Share, Declared Accounting Policies [Abstract] New Accounting Pronouncements [Policy Text Block] New Accounting Pronouncements, Policy [Policy Text Block] Employee Benefit Plans [Text Block] Pension and Other Postretirement Benefits Disclosure [Text Block] Document and Entity Information [Abstract] Document and Entity Information [Abstract] Entities [Table] Entities [Table] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] Entity Information [Line Items] Entity Information [Line Items] Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Document Type Document Type Document Period End Date Document Period End Date Amendment Flag Amendment Flag Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Current Fiscal Year End Date Current Fiscal Year End Date Entity Current Reporting Status Entity Current Reporting Status Entity Filer Category Entity Filer Category Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Schedule of Available-for-sale Securities [Table] Schedule of Available-for-sale Securities [Table] Type of Security Major Types of Debt and Equity Securities [Axis] Type of Security Major Types of Debt and Equity Securities [Domain] U.S. Treasury and government agencies U.S. Treasury Securities and U.S. Government Agencies Debt Securities [Member] U.S. Treasury Securities and U.S. Government Agencies Debt Securities [Member] U.S. government sponsored agencies US Government-sponsored Enterprises Debt Securities [Member] Bank-issued trust preferred securities Bank-Issued Trust Preferred Securities [Member] Bank-Issued Trust Preferred Securities [Member] Equity securities Equity Securities [Member] Schedule of Available-for-sale Securities Schedule of Available-for-sale Securities [Line Items] Amortized Cost Available-for-sale Securities, Amortized Cost Basis Gross Unrealized Gains AvailableForSaleDebtSecuritiesGrossUnrealizedGainAccumulatedInInvestments Amount of accumulated pre-tax unrealized gain before deducting pre-tax unrealized loss on investments in available-for-sale debt securities impacting investments. Gross Unrealized Losses AvailableForSaleDebtSecuritiesGrossUnrealizedLossAccumulatedinInvestments Amount of accumulated pre-tax unrealized loss before deducting pre-tax unrealized gain on investments in available-for-sale debt securities impacting investments. Fair Value Available-for-sale Securities Investments, Debt and Equity Securities [Abstract] Federal income tax rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Investment Securities Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Share-based Compensation [Abstract] Stock-Based Compensation Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Schedule of Impaired Financing Receivable [Table] Schedule of Impaired Financing Receivable [Table] Financing Receivable, Impaired [Line Items] Financing Receivable, Impaired [Line Items] Unpaid Principal Balance Impaired Financing Receivable, Unpaid Principal Balance Recorded Investment With Allowance Impaired Financing Receivable, with Related Allowance, Recorded Investment Recorded Investment Without Allowance Impaired Financing Receivable, with No Related Allowance, Recorded Investment Total Recorded Investment Impaired Financing Receivable, Recorded Investment Related Allowance Impaired Financing Receivable, Related Allowance Average Recorded Investment Impaired Financing Receivable, Average Recorded Investment Interest Income Recognized Impaired Financing Receivable, Interest Income, Accrual Method Fair Value Disclosures [Abstract] Assets Measured at Fair Value on a Recurring Basis Fair Value, Assets Measured on Recurring Basis [Table Text Block] Fair Value Amounts Disclosured [Table Text Block] Fair Value, Option, Quantitative Disclosures [Table Text Block] Fair Values of Financial Assets and Liabilities on Balance Sheets Fair Value, by Balance Sheet Grouping [Table Text Block] Schedule of Share-based Compensation, 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] 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] Range of Exercise Price $23.59 - $25.94 Exercise Price Range Three [Member] Exercise Price Range Three [Member] Range of Exercise Price $26.01 - $27.74 Exercise Price Range Four [Member] Exercise Price Range Four [Member] Range of Exercise Price $28.25 - $28.26 Exercise Price Range Five [Member] Exercise Price Range Five [Member] Range of Exercise Price $28.57 - $30.00 Exercise Price Range Six [Member] Exercise Price Range Six [Member] Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Line Items] Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Number of Shares Subject to Options Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Outstanding at January 1 Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Expired Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period June 30, 2014 Weighted-Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Outstanding at January 1 Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Expired Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price June 30, 2014 Stock Options Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] Weighted-average remaining contractual life, outstanding Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Aggregate intrinsic value, outstanding Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Number of common shares subject to options, exercisable Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Weighted-average exercise price, exercisable Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price Weighted-average remaining contractual life, exercisable Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Aggregate intrinsic value, exercisable Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value Range of exercise prices, minimum Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit Range of exercise prices, maximum Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit Shares Subject to Options Outstanding & Exercisable Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Exercisable Options Weighted-Average Remaining Contractual Life Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Remaining Contractual Term Weighted-Average Exercise Price Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Exercisable Options, Weighted Average Exercise Price Performance of Fair Value Against Book Value [Axis] Performance of Fair Value Against Book Value [Axis] Performance of Fair Value Against Book Value [Axis] Performance of Fair Value Against Book Value [Domain] Performance of Fair Value Against Book Value [Domain] Performance of Fair Value Against Book Value [Domain] Fair Value Less Than 90 Percent of Book Value [Member] Fair Value Less Than 90 Percent of Book Value [Member] Fair Value Less Than 90 Percent of Book Value [Member] Mortgage-backed securities, issued by US government sponsored agencies Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] Mortgage-backed securities, privately issued Mortgage-backed Securities, Issued by Private Enterprises [Member] Available-for-sale securities that had an unrealized loss: Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] Less than 12 months, fair value Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value Less than 12 months, unrealized loss AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLossesAccumulatedInInvestments Amount of accumulated pre-tax unrealized loss on investments in available-for-sale securities that have been in a loss position for less than twelve months impacting investments. Less than 12 months, no. of securities Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, More than 12 Months, Number of Positions Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, More than 12 Months, Number of Positions Number of privately issued mortgage-backed securities securities with book value less than 90% of fair value Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, More than 12 Months, Number of Positions with Fair Value Less than 90% of Book Value Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, More than 12 Months, Number of Positions with Fair Value Less than 90% of Book Value 12 months or more, fair value Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 12 months or more, unrealized loss AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLossesAccumulatedInInvestments Amount of accumulated pre-tax unrealized loss on securities classified as available-for-sale that have been in a loss position for twelve months or longer impacting investments. 12 months or more, no. of securities Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, 12 Months or Longer, Number of Positions Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, 12 Months or Longer, Number of Positions Total unrealized loss position, fair value Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value Total unrealized loss AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLossesAccumulatedInInvestments Amount of accumulated pre-tax unrealized loss on securities classified as available-for-sale impacting investments. Percentage of mortgage-backed securities in unrealized loss position for more than 12 months Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Less than 12 Months, Percentage of Positions Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Less than 12 Months, Percentage of Positions Book value of privately issued mortgage-backed securities in unrealized loss position for more than 12 months Available-for-sale Securities, Continuous Unrealized Loss Position, More than 12 Months, Aggregate Book Value Available-for-sale Securities, Continuous Unrealized Loss Position, More than 12 Months, Aggregate Book Value Fair value within book value Fair value within book value Fair value within book value Number of bank-issued trust preferred securities in unrealized loss position for twelve months or more Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions Acquisitions Business Combination Disclosure [Text Block] Earnings Per Share [Abstract] Earnings Per Common Share Earnings Per Share [Text Block] Schedule of Financing Receivable, Troubled Debt Restructurings [Table] Schedule of Financing Receivable, Troubled Debt Restructurings [Table] Bankruptcy of Parties [Axis] Bankruptcy of Parties [Axis] Bankruptcy of Parties [Axis] Bankruptcy of Parties [Domain] Bankruptcy of Parties [Domain] [Domain] for Bankruptcy of Parties [Axis] Financing Receivable, Modifications [Line Items] Financing Receivable, Modifications [Line Items] Loans and Leases Receivable, Impaired, Commitment to Lend Loans and Leases Receivable, Impaired, Commitment to Lend Financing Receivable Modifications Number Of Contracts During Period Financing Receivable Modifications Number Of Contracts During Period Financing Receivable Modifications Number Of Contracts During Period Recorded Investment, Pre-Modification Financing Receivable Modifications Pre Modification Recorded Investment During Period Financing Receivable Modifications Pre Modification Recorded Investment During Period Recorded Investment, Post-Modification Financing Receivable Modifications Post Modification Recorded Investment During Period Financing Receivable Modifications Post Modification Recorded Investment During Period Total Recorded Investment Financing Receivable Modifications Recorded Investment During Period Financing Receivable Modifications Recorded Investment During Period Financing Receivable, Modifications, Subsequent Default, Number of Contracts Financing Receivable, Modifications, Subsequent Default, Number of Contracts Financing Receivable, Modifications, Subsequent Default, Recorded Investment Financing Receivable, Modifications, Subsequent Default, Recorded Investment Financing Receivable, Modifications, Subsequent Default, Determination of Allowance for Credit Losses Financing Receivable, Modifications, Subsequent Default, Determination of Allowance for Credit Losses Fair Value Fair Value, by Balance Sheet Grouping [Table] Measurement Basis Measurement Basis [Axis] Fair Value Measurement Fair Value Measurement [Domain] Portion at Fair Value Measurement [Member] Portion at Fair Value Measurement [Member] Carrying Amount Reported Value Measurement [Member] Fair Value Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Financial assets: Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] Cash and cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Investment securities Investments, Fair Value Disclosure Loans Loans Receivable and Loans Held-for-sale, Fair Value Disclosure Loans Receivable and Loans Held-for-sale, Fair Value Disclosure Financial liabilities: Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] Deposits Deposits, Fair Value Disclosure Short-term borrowings Short-term Debt, Fair Value Long-term borrowings Long-term Debt, Fair Value Schedule of Financing Receivable, Allowance for Credit Losses [Table] Schedule of Financing Receivable, Allowance for Credit Losses [Table] 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 Net recoveries (charge-offs) Financing Receivable, Allowance for Credit Losses, Net Recoveries (Write-downs) Financing Receivable, Allowance for Credit Losses, Net Recoveries (Write-downs) Provision for loan losses Ending balance Period-end amount allocated to: Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] Loans individually evaluated for impairment Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment Loans collectively evaluated for impairment Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment Ending balance Gross gains and gross losses realized from sales of available-for-sale securities: Available-for-sale Securities, Gross Realized Gain (Loss), Excluding Other than Temporary Impairments [Abstract] Gross gains realized Available-for-sale Securities, Gross Realized Gains Gross losses realized Available-for-sale Securities, Realized Losses, Excluding Other than Temporary Impairments Net gain realized Available-for-sale Securities, Gross Realized Gain (Loss), Excluding Other than Temporary Impairments Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Restricted Shares Restricted Stock [Member] Award Vesting Basis [Axis] Award Vesting Basis [Axis] Award Vesting Basis [Axis] Award Vesting Basis [Domain] Award Vesting Basis [Domain] Award Vesting Basis [Domain] Time-Based Vesting Time-based Vesting [Member] Time-based Vesting [Member] Performance-Based Vesting Performance-based Vesting [Member] Performance-based Vesting [Member] Restricted Stock Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Number of Shares Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Outstanding at January 1 Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Awarded Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Released Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Forfeited Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period June 30, 2014 Weighted - Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract] Outstanding at January 1 Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Awarded Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Released Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Forfeited Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value June 30, 2014 Total stock-based compensation Allocated Share-based Compensation Expense Recognized tax benefit Employee Service Share-based Compensation, Tax Benefit from Compensation Expense Net expense recognized Allocated Share-based Compensation Expense, Net of Tax Schedule of Financing Receivable, Recorded Investment, Credit Quality Indicator [Table] Schedule of Financing Receivable, Recorded Investment, Credit Quality Indicator [Table] Purchased credit impaired loans Financing Receivable, Recorded Investment [Line Items] Outstanding balance Financing Receivable, Acquired with Deteriorated Credit Quality Carrying amount Financing Receivable, Acquired with Deteriorated Credit Quality, Net of Deferred Income Financing Receivable, Acquired with Deteriorated Credit Quality, Net of Deferred Income Statement of Financial Position [Abstract] Assets Assets [Abstract] Available-for-sale investment securities at amortized cost Held-to-maturity investment securities at fair value Stockholders’ Equity Statement of Stockholders' Equity [Abstract] Preferred stock - shares authorized Preferred Stock, Shares Authorized Preferred stock - shares issued Preferred Stock, Shares Issued Common stock - shares authorized Common Stock, Shares Authorized Common stock - shares issued Treasury stock - shares Nonrecurring Fair Value Measurements, Recurring and Nonrecurring [Table] Measurement Frequency Measurement Frequency [Axis] Measurement Frequency Fair Value, Measurement Frequency [Domain] Nonrecurring Basis Fair Value, Measurements, Nonrecurring [Member] Hierarchy Fair Value, Hierarchy [Axis] Hierarchy Fair Value Hierarchy [Domain] Significant Other Observable Inputs (Level 2) Fair Value, Inputs, Level 2 [Member] Nonrecurring Basis Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Impaired loans, aggregate outstanding principal balance Impaired Financing Receivable, Outstanding Principal Balance Measured at Fair Value Impaired Financing Receivable, Outstanding Principal Balance Measured at Fair Value Impaired Financing Receivable, Fair Value Disclosure Impaired Financing Receivable, Fair Value Disclosure Impaired Financing Receivable, Fair Value Disclosure Losses on impaired loans charged through allowance for loan losses Provision for Loan and Lease Losses SARs Stock Appreciation Rights (SARs) [Member] Equity Instruments Other than Options by Exercise Price [Axis] Equity Instruments Other than Options by Exercise Price [Axis] Equity Instruments Other than Options by Exercise Price [Axis] Equity Instruments Other than Options, Exercise Price [Domain] Equity Instruments Other than Options, Exercise Price [Domain] Equity Instruments Other than Options, Exercise Price [Domain] Exercise Price $23.26 Exercise Price One [Member] Exercise Price One [Member] Exercise Price $23.77 Exercise Price Two [Member] Exercise Price Two [Member] Exercise Price $29.25 Exercise Price Three [Member] Exercise Price Three [Member] Stock Appreciation Rights Shares outstanding Exercise Price Deferred Compensation Arrangement with Individual, Exercise Price Number of Shares Subject to SARs Outstanding & Exercisable Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested and Expected to Vest, Exercisable, Number Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested and Expected to Vest, Exercisable, Number Weighted- Average Remaining Contractual Life Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Terms Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Terms Outstanding shares, weighted-average exercise price Shares outstanding, weighted-average remaining contractual life Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms Shares outstanding, aggregate intrinsic value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Intrinsic Value Shares exercisable Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Exercisable, Number Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Exercisable, Number Shares exercisable, weighted-average exercise price Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Exercisable, Weighted Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Exercisable, Weighted Average Exercise Price Shares exercisable, weighted-average remaining contractual life Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Exercisable, Weighted Average Remaining Contractual Terms Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Exercisable, Weighted Average Remaining Contractual Terms Shares exercisable, aggregate intrinsic value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Exercisable, Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Exercisable, Intrinsic Value Title of Individual [Axis] Title of Individual [Axis] Title of Individual with Relationship to Entity [Domain] Relationship to Entity [Domain] Employees Employee [Member] Employee [Member] Non-employee directors Non-employee Directors [Member] Non-employee Directors [Member] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum Minimum [Member] Maximum Maximum [Member] Shares authorized under 2006 Equity Plan Shares authorized under 2006 Equity Plan Shares authorized under 2006 Equity Plan Common shares authorized under the 2006 Equity Plan Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Awards expiration period Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period Awards vesting period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Total intrinsic value of awards released in period Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Intrinsic Value Unrecognized stock-based compensation expense related to unvested awards, amount Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized Unrecognized stock-based compensation expense related to unvested awards, weighted-average period of recognition Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition Accumulated Other Comprehensive (Loss) Income [Roll Forward] Accumulated Other Comprehensive Income (Loss) [Roll Forward] Accumulated Other Comprehensive Income (Loss) [Roll Forward] Unrealized (Loss) Gain on Securities Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax Realized gain on sale of securities, net of tax Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax Other comprehensive income (loss), net of reclassifications and tax Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax Unrealized (Loss) Gain on Securities Unrecognized Net Pension and Postretirement Costs Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax Realized loss due to settlement and curtailment, net of tax Other Comprehensive Income (Loss), Finalization of Pension and Other Postretirement Benefit Plan Valuation, Net of Tax Other comprehensive income (loss), net of reclassifications and tax Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Reclassification Adjustments, Net of Tax Unrecognized Net Pension and Postretirement Costs Accumulated Other Comprehensive (Loss) Income Accumulated Other Comprehensive Income (Loss), Net of Tax Realized gain on sale of securities, net of tax Other Comprehensive Income (Loss), Reclassification Adjustment in Net Income, Net of Tax Other Comprehensive Income (Loss), Reclassification Adjustment in Net Income, Net of Tax Realized loss due to settlement and curtailment, net of tax Other Comprehensive Income (Loss), Settlement and Curtailment Costs of Pension and Other Postretirement Benefit Plan Valuation, Net of Tax Other Comprehensive Income (Loss), Settlement and Curtailment Costs of Pension and Other Postretirement Benefit Plan Valuation, Net of Tax Other comprehensive income (loss), net of reclassifications and tax Other Comprehensive Income (Loss), Net of Reclassifications and Tax Other Comprehensive Income (Loss), Net of Reclassifications and Tax Accumulated Other Comprehensive (Loss) Income Amortized Cost Gross Unrealized Gains HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain This item represents the excess of amortized cost basis over fair value of securities in a gain position and which are categorized as held-to-maturity. Gross Unrealized Losses HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLosses This item represents the excess of amortized cost basis over fair value of securities in a loss position and which are categorized as held-to-maturity. Realized Gain (Loss) on Held-to-Maturity Securities Held-to-maturity Securities, Sold Security, Realized Gain (Loss), Excluding Other than Temporary Impairments Cash and due from banks Cash and Due from Banks Interest-bearing deposits in other banks Interest-bearing Deposits in Banks and Other Financial Institutions Total cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Available-for-sale investment securities, at fair value (amortized cost of $592,954 at June 30, 2014 and $621,126 at December 31, 2013) Held-to-maturity investment securities, at amortized cost (fair value of $49,239 at June 30, 2014 and $46,094 at December 31, 2013) Held-to-maturity Securities Other investment securities, at cost Cost Method Investments Total investment securities Marketable Securities Loans, net of deferred fees and costs Allowance for loan losses Loans and Leases Receivable, Allowance Net loans Loans held for sale Loans Held-for-sale, Other Bank premises and equipment, net Property, Plant and Equipment, Net Goodwill Goodwill Other assets Other Assets Total assets Assets Liabilities Liabilities [Abstract] Non-interest-bearing deposits Noninterest-bearing Deposit Liabilities Interest-bearing deposits Interest-bearing Deposit Liabilities Total deposits Deposits Short-term borrowings Short-term Debt Long-term borrowings Long-term Debt Accrued expenses and other liabilities Other Liabilities Total liabilities Liabilities Stockholders’ Equity Preferred stock, no par value, 50,000 shares authorized, no shares issued at June 30, 2014 and December 31, 2013 Preferred Stock, Value, Issued Common stock, no par value, 24,000,000 shares authorized, 11,529,732 shares issued at June 30, 2014 and 11,206,576 shares issued at December 31, 2013, including shares in treasury Common Stock, Value, Issued Retained earnings Retained Earnings (Accumulated Deficit) Accumulated other comprehensive loss, net of deferred income taxes Treasury stock, at cost, 603,296 shares at June 30, 2014 and 600,794 shares at December 31, 2013 Treasury Stock, Value Total stockholders’ equity Stockholders' Equity Attributable to Parent Total liabilities and stockholders’ equity Liabilities and Equity Schedule of Goodwill and Intangibles Schedule of Goodwill [Table] Goodwill [Member] Goodwill [Member] Gross Core Deposit [Member] Gross Core Deposit [Member] Gross Core Deposit [Member] Gross Customer Relationship [Member] Gross Customer Relationship [Member] Gross Customer Relationship [Member] Goodwill and Intangible Assets Goodwill [Line Items] Goodwill, beginning balance Goodwill, ending balance Goodwill, Acquired During Period Goodwill, Acquired During Period Finite-lived Intangible Assets Acquired Finite-lived Intangible Assets Acquired Industry of Counterparty, Type [Axis] Industry of Counterparty, Type [Axis] Industry of Counterparty [Domain] Industry of Counterparty [Domain] Legal Entity of Counterparty, Type [Axis] Legal Entity of Counterparty, Type [Axis] Legal Entity Type of Counterparty [Domain] Legal Entity Type of Counterparty [Domain] Counterparty Name [Axis] Counterparty Name [Axis] Counterparty Name [Domain] Counterparty Name [Domain] Products and Services [Axis] Products and Services [Axis] Products and Services [Domain] Products and Services [Domain] Consolidation Items [Axis] Consolidation Items [Axis] Consolidation Items [Domain] Consolidation Items [Domain] Segment Segments [Domain] Geographical [Axis] Geographical [Axis] Geographical [Domain] Geographical [Domain] Billing Status, Type [Axis] Billing Status, Type [Axis] Receivables Billing Status [Domain] Receivables Billing Status [Domain] Class of Financing Receivable [Axis] Class of Financing Receivable [Axis] Class of Financing Receivable [Domain] Class of Financing Receivable [Domain] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Accretion of Discount Accretion of Discount Investment Holdings [Table] Investment Holdings [Table] Investment Type [Axis] Investment Type [Axis] Investment Type Categorization [Domain] Investments [Domain] Available-for-sale securities Available-for-sale Securities [Member] Held-to-maturity securities Held-to-maturity Securities [Member] Investment Holdings [Line Items] Investment Holdings [Line Items] Summary of Available-for-sale Investment Securities Schedule of Available-for-sale Securities Reconciliation [Table Text Block] Schedule of Gross Gains and Losses from Sales of Available-for-sale Securities Schedule of Realized Gain (Loss) [Table Text Block] Summary of Available-for-sale Securities with Unrealized Loss Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Table Text Block] Summary of Held-to-maturity Investment Securities Held-to-maturity Securities [Table Text Block] Summary of Held-to-maturity Securities with Unrealized Loss Schedule of Unrealized Loss on Investments [Table Text Block] Summary of Investment Securities by Contractual Maturity Investments Classified by Contractual Maturity Date [Table Text Block] Recurring Basis Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value of Securities Fair Value of Securities Disclosed on Balance Sheet [Member] Fair Value of Securities Disclosed on Balance Sheet [Member] Recurring Basis [Member] Fair Value, Measurements, Recurring [Member] Fair Value Estimate of Fair Value Measurement [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) Fair Value, Inputs, Level 1 [Member] Significant Unobservable Inputs (Level 3) Fair Value, Inputs, Level 3 [Member] Recurring Basis Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Available-for-sale securities Held-to-maturity securities Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] Schedule of Stock Options Outstanding & Exercisable by Exercise Price Range Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block] Schedule of Stock Appreciation Rights Outstanding & Exercisable by Exercise Price Schedule of Share-based Compensation, Stock Appreciation Rights Award Activity [Table Text Block] Schedule of Restricted Shares Activity Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] Summary of Stock-Based Compensation and Related Tax Benefit Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block] Financial Instrument [Axis] Financial Instrument [Axis] Types of Financial Instruments [Domain] Financial Instruments [Domain] Commerical Loans Pledged assets separately reported, loans pledged as collateral, at fair value Pledged Assets Separately Reported, Loans Pledged as Collateral, at Fair Value Statement [Table] Statement [Table] Retained Earnings Retained Earnings [Member] Accumulated Other Comprehensive (Loss) Income Accumulated Other Comprehensive Income (Loss) [Member] Statement [Line Items] Statement [Line Items] Stock Issued During Period, Value, Acquisitions Stock Issued During Period, Value, Acquisitions Increase (Decrease) in Stockholders' Equity [Roll Forward] Balance, December 31, 2013 Other comprehensive income, net of tax Cash dividends declared Stock Issued During Period, Value, Stock Options Exercised Stock Issued During Period, Value, Stock Options Exercised Tax benefit from exercise of stock options Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation Reissuance of treasury stock for deferred compensation plan for Boards of Directors Stock Issued During Period, Value, Treasury Stock Reissued Purchase of treasury stock Treasury Stock, Value, Acquired, Cost Method Common shares issued under dividend reinvestment plan Stock Issued During Period, Value, Dividend Reinvestment Plan Common shares issued under compensation plan for Board of Directors Share-based Compensation Stock-based compensation expense Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures Balance, June 30, 2014 Distributed earnings allocated to shareholders Distributed Earnings Undistributed earnings allocated to shareholders Undistributed Earnings, Diluted Net earnings allocated to shareholders Net Income (Loss) Available to Common Stockholders, Diluted Effect of potentially dilutive shares Weighted Average Number Diluted Shares Outstanding Adjustment Total weighted-average diluted shares outstanding Anti-dilutive shares excluded from computation of EPS Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Table] Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Table] Defined Benefit Plans and Other Postretirement Benefit Plans [Axis] Defined Benefit Plans and Other Postretirement Benefit Plans [Axis] Defined Benefit Plans and Other Postretirement Benefit Plans [Domain] Defined Benefit Plan and Other Postretirement Benefit Plan [Domain] Defined Benefit Postretirement Health Coverage [Member] Defined Benefit Postretirement Health Coverage [Member] Pension Plans, Defined Benefit [Member] Pension Plan, Defined Benefit [Member] Other Postretirement Benefit Plans, Defined Benefit [Member] Other Postretirement Benefit Plan, Defined Benefit [Member] Defined Benefit Plans and Other Postretirement Benefit Plans, Coverage by Period [Axis] Defined Benefit Plans and Other Postretirement Benefit Plans, Coverage by Period [Axis] Defined Benefit Plans and Other Postretirement Benefit Plans, Coverage by Period [Axis] Defined Benefit Plans and Other Postretirement Benefit Plans, Coverage, Period [Domain] Defined Benefit Plans and Other Postretirement Benefit Plans, Coverage, Period [Domain] Defined Benefit Plans and Other Postretirement Benefit Plans, Coverage, Period [Domain] Employees Hired before January 1, 2003 [Member] Employees Hired before January 1, 2003 [Member] Employees Hired before January 1, 2003 [Member] Employees Hired on or after January 1, 2003 [Member] Employees Hired on or after January 1, 2003 [Member] Employees Hired on or after January 1, 2003 [Member] Employees Retired before January 1, 1993 [Member] Employees Retired before January 1, 1993 [Member] Employees Retired before January 1, 1993 [Member] Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] Defined Benefit Plan Disclosure [Line Items] Projected benefit obligation Defined Benefit Plan, Benefit Obligation Before Settlement Defined Benefit Plan, Benefit Obligation, Before Settlements Defined Benefit Plan, Benefit Obligation, Before Settlements Impact of Settlements Defined Benefit Plan, Settlements, Benefit Obligation Fair value of plan assets Defined Benefit Plan, Fair Value of Plan Assets Before Settlement Defined Benefit Plan, Fair Value of Plan Assets, Before Settlements Defined Benefit Plan, Fair Value of Plan Assets, Before Settlements Impact of Settlements Defined Benefit Plan, Settlements, Plan Assets Funded status Defined Benefit Plan, Funded Status of Plan Gross unrealized loss Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Gains (Losses), before Tax Before Settlement Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Gains (Losses), before Tax, before Settlements Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Gains (Losses), before Tax, before Settlements Discount rate Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate Expected return on plan assets Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets Benefit based on highest average salary for number of consecutive years Defined Benefit Plan, Contribution Per Employee, Coverage Basis, Consecutive Period of Highest Average Monthly Compensation Defined Benefit Plan, Contribution Per Employee, Coverage Basis, Consecutive Period of Highest Average Monthly Compensation Number of years for consecutive years calculation Defined Benefit Plan, Contribution Per Employee, Coverage Basis, Lastest Service Period Defined Benefit Plan, Contribution Per Employee, Coverage Basis, Lastest Service Period Percent of annual salary to calculate benefit Defined Benefit Plan, Annual Contribution Per Employee, Percent Defined Benefit Plan, Annual Contribution Per Employee, Percent Healthcare benefits for retirees prior to January 1, 1993 Defined Benefit Plan, Maximum Coverage per Retiree Defined Benefit Plan, Maximum Coverage per Retiree Components of net periodic benefit costs: Defined Benefit Plan, Net Periodic Benefit Cost [Abstract] Interest cost Defined Benefit Plan, Interest Cost Expected return on plan assets Defined Benefit Plan, Expected Return on Plan Assets Amortization of net loss Defined Benefit Plan, Future Amortization of Gain (Loss) Settlement of benefit obligation Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements Net periodic benefit cost Defined Benefit Plan, Net Periodic Benefit Cost Schedule of Securities Pledged Financial Instruments, Not Separately Reported, Held-To-Maturity Securities for Federal Home Loan Bank and Federal Reserve Bank Pledged Financial Instruments, Not Separately Reported, Held-To-Maturity Securities for Federal Home Loan Bank and Federal Reserve Bank Pledged Financial Instruments, Not Separately Reported, Held-To-Maturity Securities for Federal Home Loan Bank and Federal Reserve Bank Carrying value of available-for-sale securities pledged to secure public and trust department deposits and repurchase agreements Pledged Financial Instruments, Not Separately Reported, Available-for-sale Securities for Deposits and Repurchase Agreements Pledged Financial Instruments, Not Separately Reported, Available-for-sale Securities for Deposits and Repurchase Agreements Carrying value of held-to-maturity securities pledged to secure public and trust department deposits and repurchase agreements Pledged Financial Instruments, Not Separately Reported, Held-to-maturity Securities for Deposits and Repurchase Agreements Pledged Financial Instruments, Not Separately Reported, Held-to-maturity Securities for Deposits and Repurchase Agreements Carrying value of available-for-sale securities pledged to secure additional borrowing capacity at Federal Home Loan Bank and Federal Reserve Bank Pledged Financial Instruments, Not Separately Reported, Available-for-sale Securities for Federal Home Loan Bank and Federal Reserve Bank Pledged Financial Instruments, Not Separately Reported, Available-for-sale Securities for Federal Home Loan Bank and Federal Reserve Bank Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Debt securities, maturing within 1 year, amortized cost Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis Debt securities, maturing 1 to 5 years, amortized cost Available-for-sale Securities, Debt Maturities, Rolling Year Two Through Five, Amortized Cost Basis Debt securities, maturing 5 to 10 years, amortized cost Available-for-sale Securities, Debt Maturities, Rolling Year Six Through Ten, Amortized Cost Basis Debt securities, maturing over 10 years, amortized cost Available-for-sale Securities, Debt Maturities, Rolling after Year Ten, Amortized Cost Basis Debt securities, total amortized cost Available-for-sale Securities, Debt Maturities, Amortized Cost Basis Other securities, maturing over 10 years, amortized cost Available-for-sale Securities, Other Maturities, Rolling after Year Ten, Amortized Cost Basis Available-for-sale Securities, Other Maturities, Rolling after Year Ten, Amortized Cost Basis Other securities, total amortized cost Available-for-sale Securities, Other Maturities, Amortized Cost Basis Available-for-sale Securities, Other Maturities, Amortized Cost Basis Available-for-sale securities, maturing over 10 years, amortized cost Available-for-sale Securities, Maturities, Rolling after Year Ten, Amortized Cost Basis Available-for-sale Securities, Maturities, Rolling after Year Ten, Amortized Cost Basis Available-for-sale securities, total amortized cost Debt securities, maturing within 1 year, fair value Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value Debt securities, maturing 1 to 5 years, fair value Available-for-sale Securities, Debt Maturities, Rolling Year Two Through Five, Fair Value Debt securities, maturing 5 to 10 years, fair value Available-for-sale Securities, Debt Maturities, Rolling Year Six Through Ten, Fair Value Debt securities, maturing over 10 years, fair value Available-for-sale Securities, Debt Maturities, Rolling after Year Ten, Fair Value Debt securities, total fair value Available-for-sale Securities, Debt Securities Other securities, maturing over 10 years, fair value Available-for-sale Securities, Other Maturities, Rolling after Year Ten, Fair Value Available-for-sale Securities, Other Maturities, Rolling after Year Ten, Fair Value Other securities, total fair value Available-for-sale Securities, Other Maturities, Fair Value Available-for-sale Securities, Other Maturities, Fair Value Available-for-sale securities, maturing over 10 years, fair value Available-for-sale Securities, Maturities, Rolling after Year Ten, Fair Value Available-for-sale Securities, Maturities, Rolling after Year Ten, Fair Value Available-for-sale securities, maturing within 1 year, average yield Available-for-sale Securities, Maturities, Next Rolling Twelve Months, Average Yield Available-for-sale Securities, Maturities, Next Rolling Twelve Months, Average Yield Available-for-sale securities, maturing 1 to 5 years, average yield Available-for-sale Securities, Maturities, Rolling Year Two Through Five, Average Yield Available-for-sale Securities, Maturities, Rolling Year Two Through Five, Average Yield Available-for-sale securities, maturing 5 to 10 years, average yield Available-for-sale Securities, Maturities, Rolling Year Six Through Ten, Average Yield Available-for-sale Securities, Maturities, Rolling Year Six Through Ten, Average Yield Available-for-sale securities, maturing over 10 years, average yield Available-for-sale Securities, Maturities, Rolling after Year Ten, Average Yield Available-for-sale Securities, Maturities, Rolling after Year Ten, Average Yield Available-for-sale securities, total average yield Available-for-sale Securities, Average Yield Available-for-sale Securities, Average Yield Schedule of Financing Receivables, Type Schedule of Financing Receivables, Type [Table Text Block] Schedule of Financing Receivables, Type [Table Text Block] Schedule of Financing Receivables Acquired with Deteriorated Credit Quality Schedule of Financing Receivables Acquired with Deteriorated Credit Quality [Table Text Block] Schedule of Financing Receivables Acquired with Deteriorated Credit Quality [Table Text Block] Nonaccrual and Past Due Loans Schedule of Financing Receivables, Non Accrual Status [Table Text Block] Aging Of The Recorded Investment In Past Due Loans And Leases Past Due Financing Receivables [Table Text Block] Loans By Risk Category Financing Receivable Credit Quality Indicators [Table Text Block] Schedule Of Impaired Loans Impaired Financing Receivables [Table Text Block] Troubled Debt Restructurings on Financing Receivables Troubled Debt Restructurings on Financing Receivables [Table Text Block] Summary Of Activity In Allowance For Loan And Lease Losses Allowance for Credit Losses on Financing Receivables [Table Text Block] Troubled Debt Restructurings during prior 12 months that subsequently defaulted [Table Text Block] Troubled Debt Restructurings during prior 12 months that subsequently defaulted [Table Text Block] Troubled Debt Restructurings during prior 12 months that subsequently defaulted [Table Text Block] Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield [Table Text Block] Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield [Table Text Block] Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Accretable Yield [Table Text Block] Schedule of Net Benefit Costs [Abstract] Schedule of Net Benefit Costs [Abstract] 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] Schedule of Pension Plans Remeasurement and Settlements [Text Block] Schedule of Pension Plans Remeasurement and Settlements [Text Block] Schedule of Pension Plans Remeasurement and Settlements [Text Block] Schedule of Net Benefit Costs [Table Text Block] Schedule of Net Benefit Costs [Table Text Block] Calculations of Basic and Diluted Earnings per Common Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Schedule of Preferred, Common and Treasury Stock Schedule of Stock by Class [Table Text Block] Schedule of Accumulated Other Comprehensive (Loss) Income Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Statement of Cash Flows [Abstract] Scenario [Axis] Scenario [Axis] Scenario, Unspecified [Domain] Scenario, Unspecified [Domain] Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Investing activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Purchases Payments to Acquire Available-for-sale Securities Proceeds from sales Proceeds from Sale of Available-for-sale Securities Proceeds from principal payments, calls and prepayments Proceeds from Maturities, Prepayments and Calls of Available-for-sale Securities Held-to-maturity investment securities: Held-to-maturity Securities, Other Disclosure Items [Abstract] Purchases Payments to Acquire Held-to-maturity Securities Proceeds from principal payments Proceeds from Maturities, Prepayments and Calls of Held-to-maturity Securities Net increase in loans Increase (Decrease) in Loans Held-for-sale Net expenditures for premises and equipment Payments to Acquire Property, Plant, and Equipment Proceeds from sales of other real estate owned Proceeds from Sale of Other Real Estate Proceeds from bank owned life insurance contracts Payments for (Proceeds from) Life Insurance Policies Business acquisitions, net of cash received Payments to Acquire Businesses, Net of Cash Acquired Return of (investment in) limited partnership and tax credit funds Payments for (Proceeds from) Limited Partnership Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities, Continuing Operations Financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Net increase in non-interest-bearing deposits Increase (Decrease) in Demand Deposits Net increase (decrease) in interest-bearing deposits Increase (Decrease) in Deposits Net increase in short-term borrowings Proceeds from (Repayments of) Short-term Debt Payments on long-term borrowings Repayments of Long-term Debt Cash dividends paid Payments of Ordinary Dividends, Common Stock Purchase of treasury stock Payments for Repurchase of Common Stock Proceeds from issuance of shares Proceeds from Issuance of Common Stock Excess tax benefit from share-based payments Excess Tax Benefit from Share-based Compensation, Financing Activities Net cash used in financing activities Net Cash Provided by (Used in) Financing Activities Net increase (decrease) in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash and cash equivalents at beginning of period Cash and cash equivalents at end of period Fair Value of Financial Instruments Fair Value, Measurement Inputs, Disclosure [Text Block] Acquisitions Schedule of Business Acquisitions, by Acquisition [Table] Midwest Bancshares, Inc. Loans Acquired [Member] Midwest Bancshares, Inc. Loans Acquired [Member] Midwest Bancshares, Inc. Loans Acquired [Member] Midwest Bancshares, Inc. Deposits Acquired [Member] Midwest Bancshares, Inc. Deposits Acquired [Member] Midwest Bancshares, Inc. Deposits Acquired [Member] Acquisition Business Acquisition [Line Items] Business Combination, Consideration Transferred Business Combination, Consideration Transferred Business Combination, Acquired Receivables, Fair Value Business Combination, Acquired Receivables, Fair Value Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities Goodwill and Intangible Assets Disclosure [Abstract] Schedule of Goodwill [Table Text Block] Schedule of Goodwill [Table Text Block] Schedule of Finite-Lived Intangible Assets [Table Text Block] Schedule of Finite-Lived Intangible Assets [Table Text Block] Internal Credit Assessment [Axis] Internal Credit Assessment [Axis] Internal Credit Assessment [Domain] Internal Credit Assessment [Domain] Pass Rated (Grades 1 - 4) Pass [Member] Watch (Grade 5) Special Mention [Member] Substandard (Grade 6) Substandard [Member] Doubtful (Grade 7) Doubtful [Member] Not Rated Not Rated [Member] Not Rated [Member] Total Loans Financing Receivable [Member] Nonaccrual Loans Financing Receivable, Recorded Investment, Nonaccrual Status Accruing Loans 90 or More Days Past Due Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing Loans Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Less than 12 months, fair value Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value Less than 12 months, unrealized loss HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss This item represents the excess of amortized cost basis over fair value of securities that have been in a loss position for less than twelve months for those securities which are categorized as held-to-maturity. Less than 12 months, no. of securities Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Less than 12 Months, Number of Positions Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Less than 12 Months, Number of Positions 12 months or more, fair value Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 12 months or more, unrealized loss HeldToMaturitySecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss Amount of accumulated pre-tax unrealized loss on investments in held-to-maturity securities that have been in a loss position for twelve months or longer. 12 months or more, no. of securities Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, 12 Months or Longer, Number of Positions Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, 12 Months or Longer, Number of Positions Total fair value Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value Total unrealized loss