Transfers and Servicing [Abstract] Servicing Asset at Amortized Cost [Table] Financial Instrument [Axis] Financial Instruments [Domain] Mortgages [Member] Mortgages [Member] Residential Mortgage [Member] Servicing Asset at Amortized Cost [Line Items] Amortized Cost: Servicing Asset at Amortized Cost, Balance [Roll Forward] Balance at beginning of period Servicing Asset at Amortized Cost Originations of mortgage servicing rights Servicing Asset at Amortized Cost, Additions Amortization Servicing Asset at Amortized Cost, Amortization Balance at end of period Valuation Allowance: Valuation Allowance for Impairment of Recognized Servicing Assets [Roll Forward] Balance at beginning of period Valuation Allowance for Impairment of Recognized Servicing Assets, Balance Reversals Valuation Allowance for Impairment of Recognized Servicing Assets, Provisions (Recoveries) Balance at end of period Net MSRs at end of period Servicing Asset at Amortized Cost, Fair Value Valuation Allowance for Impairment of Recognized Servicing Assets, Period Increase (Decrease) Valuation Allowance for Impairment of Recognized Servicing Assets, Period Increase (Decrease) Servicing Asset at Fair Value, Amount Servicing Asset at Fair Value, Amount Commitments and Contingencies Disclosure [Abstract] Summary of Outstanding Commitments to Extend Credit and Letters of Credit Summary Of Outstanding Commitments To Extend Credit And Letters Of Credit Text Block Summary Of Outstanding Commitments To Extend Credit And Letters Of Credit [Text Block] Receivables [Abstract] Schedule of Financing Receivable, Recorded Investment, Credit Quality Indicator [Table] Schedule of Financing Receivable, Recorded Investment, Credit Quality Indicator [Table] Financing Receivable Information by Credit Quality Indicator [Axis] Internal Credit Assessment [Axis] Internal Credit Assessment [Domain] Internal Credit Assessment [Domain] Pass [Member] Pass [Member] Special Mention [Member] Special Mention [Member] Substandard [Member] Substandard [Member] Financing Receivable Information by Portfolio Segment [Axis] Class of Financing Receivable [Axis] Financing Receivable, Recorded Investment, Class of Financing Receivable [Domain] Class of Financing Receivable [Domain] Commercial Loans, Commerical Mortgages, Constructions Loans [Member] Commercial Loans, Commercial Mortgages, Constructions Loans [Member] Commercial Loans, Commerical Mortgages, Constructions Loans [Member] Real-estate commercial mortage [Member] Commercial Real Estate Portfolio Segment [Member] Commercial - 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home equity [Member] Home Equity Line of Credit [Member] Real-estate - residential mortgage [Member] Residential Portfolio Segment [Member] Real-estate - construction [Member] Commercial Real Estate Construction Financing Receivable [Member] Consumer [Member] Consumer Portfolio Segment [Member] Leasing and other and overdrafts [Member] Leasing and Other and Overdrafts [Member] Leasing and Other and Overdrafts [Member] Unallocated [Member] Unallocated Financing Receivables [Member] Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Beginning Balance Loans and Leases Receivable, Allowance Loans charged off Allowance for Loan and Lease Losses, Write-offs Recoveries of loans previously charged off Allowance for Loan and Lease Losses, Recoveries of Bad Debt Recoveries of debt previously charged off Net loans charged off Loans Charged Off, Net Of Recoveries Reflects the increase in the allowance account attributable to collections of loans and lease receivables which had previously been fully or partially charged off as bad debts. Provision for loan losses Allowance for loan and lease losses, provision for loss, net of provision applied to unfunded commitments Allowance for loan and lease losses, provision for loss, net of provision applied to unfunded commitments. Ending Balance Provision for loan losses gross Provision for loan losses gross Represents the change in allocation needs for commitments to lend to borrowers. Provision for Loan and Lease Losses Provision for Loan and Lease Losses Schedule of Impaired Financing Receivable Schedule of Impaired Financing Receivable [Table] Commercial - unsecured [Member] Construction - commercial residential [Member] Construction other [Member] Construction other [Member] Construction other [Member] Consumer - direct [Member] Consumer - Direct [Member] Consumer - Direct [Member] Consumer - Indirect [Member] Consumer - Indirect [Member] Consumer - Indirect [Member] Impaired Financing Receivables [Line Items] Financing Receivable, Impaired [Line Items] Unpaid principal balance, with no related allowance Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance Unpaid principal balance, with related allowance Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance Unpaid Principal Balance Impaired Financing Receivable, Unpaid Principal Balance Recorded investment, with no related allowance Impaired Financing Receivable, with No Related Allowance, Recorded Investment Recorded investment, with related allowance Impaired Financing Receivable, with Related Allowance, Recorded Investment Recorded Investment Impaired Financing Receivable, Recorded Investment Related Allowance Impaired Financing Receivable, Related Allowance Allowance for loan losses Reserve for unfunded lending commitments Reserve For Unfunded Lending Commitments Reserves associated with probable credit losses related to commitments to lend amounts to borrowers as of the balance sheet date. 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Available for Sale Securities, Debt Maturities, Before Securities Without Single Maturities Available for Sale Securities, Debt Maturities, Before Securities Without Single Maturities Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value Available-for-sale Debt Securities, Amortized Cost Basis Available-for-sale Debt Securities, Amortized Cost Basis Available for Sale, Estimated Fair Value Available-for-sale Securities, Debt Securities Allowance for Loan and Lease Losses [Roll Forward] Balance at beginning of period Provision for credit losses Balance at end of period Schedule of Impaired Financing Receivable [Table] Construction - Commercial Residential [Member] Financing Receivable, Impaired [Line Items] Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method Impaired Financing Receivable, with Related Allowance, Average Recorded Investment Impaired Financing Receivable, with Related Allowance, Average Recorded Investment Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method Impaired Financing Receivable, Average Recorded Investment Impaired Financing Receivable, Average Recorded Investment Impaired Financing Receivable, Interest Income, Accrual Method Impaired Financing Receivable, Interest Income, Accrual Method Document Information [Table] Document Information, Document [Axis] Document Information, Document [Axis] Document [Domain] Document [Domain] Document Information [Line Items] Document Information [Line Items] Document and Entity Information Document and Entity Information Document and Entity Information Abstract Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Trading Symbol Trading Symbol 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 Fair Value Disclosures [Abstract] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Table] Fair Value Measurements, Recurring and Nonrecurring 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Accounting Pronouncements, Policy [Policy Text Block] Investment Securities Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Fair Value Measurements [Table] Fair Value, Inputs, Level 1 [Member] Fair Value, Inputs, Level 1 [Member] Fair Value, Inputs, Level 2 [Member] Fair Value, Inputs, Level 2 [Member] Total [Member] Equity Securities [Member] U.S. Government Securities [Member] US Government Debt Securities [Member] U.S. Government-Sponsored Agency Securities [Member] US Government-sponsored Enterprises Debt Securities [Member] State and Municipal Securities [Member] US States and Political Subdivisions Debt Securities [Member] Corporate Debt Securities [Member] Corporate Debt Securities [Member] Auction Rate Securities [Member] Mortgages Held-for-sale, Fair Value Disclosure Mortgages Held-for-sale, Fair Value Disclosure Available-for-sale Securities, Fair Value Disclosure Available-for-sale Securities Other Assets, Fair Value 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Foreign Exchange Contracts With Customer [Member] Foreign Exchange Contracts With Customer [Member] Foreign Exchange Contracts With Customer [Member] Foreign Exchange Contracts With Correspondent Banks [Member] Foreign Exchange Contracts With Correspondent Banks [Member] Foreign Exchange Contracts With Correspondent Banks [Member] Derivative [Line Items] Derivative [Line Items] Gain (Loss) on Interest Rate Derivative Instruments Not Designated as Hedging Instruments Gain (Loss) on Interest Rate Derivative Instruments Not Designated as Hedging Instruments Gain (Loss) on Foreign Currency Derivatives Recorded in Earnings, Net Gain (Loss) on Foreign Currency Derivatives Recorded in Earnings, Net Derivative Instruments, Gain (Loss) Recognized in Income, Net Derivative, Gain (Loss) on Derivative, Net Schedule of Financing Receivable, Past Due Schedule of Financing Receivables Past Due [Table] Class of Financing Receivable [Axis] Construction - Commercial [Member] Financial Receivable, 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(Loss) on Investments [Line Items] Gain (Loss) on Investments [Line Items] Gross Realized Gains Available-for-sale Securities, Gross Realized Gains Gross Realized Losses Available-for-sale Securities, Gross Realized Losses Other-than- temporary Impairment Losses Other than Temporary Impairment Losses, Investments, Available-for-sale Securities Net Gains (Losses) Available-for-sale Securities, Gross Realized Gain (Loss) Offsetting [Abstract] Balance Sheet Offsetting Offsetting Assets and Liabilities [Table Text Block] Offsetting Assets and Liabilities [Table Text Block] Schedule of Amortized Cost and Fair Values of Investment Securities Investment Holdings, Schedule of Investments [Table Text Block] Schedule of Amortized Cost and Fair Values of Debt Securities by Contractual Maturities Investments Classified by Contractual Maturity Date [Table Text Block] Summary of Gains and Losses from Equity and Debt Securities, and Losses Recognized from Other-than-Temporary Impairment Realized Gain 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Exchange Contract [Member] Foreign Exchange Contract [Member] Interest Rate Swap [Member] Interest Rate Swap [Member] Offsetting Assets [Line Items] Offsetting Assets [Line Items] Gross Amounts Recognized on the Consolidated Balance Sheets Derivative Asset, Fair Value, Gross Asset Gross Amounts Not Offset on the Consolidated Balance Sheets, Financial Instruments Derivative, Collateral, Obligation to Return Securities Gross Amounts Not Offset on the Consolidated Balance Sheets, Cash Collateral Derivative, Collateral, Obligation to Return Cash Net Amount Derivative Asset, Fair Value, Amount Offset Against Collateral Offsetting Liabilities [Table] Offsetting Liabilities [Table] Offsetting Liabilities [Line Items] Offsetting Liabilities [Line Items] Gross Amounts Recognized on the Consolidated Balance Sheets Derivative Liability, Fair Value, Gross Liability Gross Amounts Not Offset on the Consolidated Balance Sheets, Financial Instruments Derivative, Collateral, Right to Reclaim Securities Gross Amounts Not Offset on the Consolidated Balance Sheets, Cash Collateral Derivative, Collateral, Right to Reclaim Cash Net Amount Derivative Liability, Fair Value, Amount Offset Against Collateral Changes in other comprehensive income [Table Text Block] Comprehensive Income (Loss) [Table Text Block] Changes in each component of accumulated other comprehensive income [Table Text Block] Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Measurement Basis [Axis] Fair Value Measurement [Domain] Portion at Fair Value Measurement [Member] Portion at Fair Value Measurement [Member] Reported Value Measurement [Member] Estimate of Fair Value Measurement [Member] Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Cash and Cash Equivalents Cash and Cash Equivalents, Fair Value Disclosure Interest-Rate Deposits with Other Banks Interest-Rate Deposits with Other Banks, Fair Value Disclosure Interest-Rate Deposits with Other Banks, Fair Value Disclosure Investment in Federal Home Loan Bank Stock, Fair Value Disclosure Investment in Federal Home Loan Bank Stock, Fair Value Disclosure Loans Held-for-sale Loans Held-for-sale, Fair Value Disclosure Available for sale investment securities Loans, net of unearned income Loans, Net Of Deferred Income, Fair Value Disclosure Loans, Net Of Deferred Income, Fair Value Disclosure Accrued Interest Receivable Interest Receivable, Fair Value Disclosure Interest Receivable, Fair Value Disclosure Other Financial Assets Demand and Savings Deposit Liabilities, Fair Value Disclosure Demand and Savings Deposit Liabilities, Fair Value Disclosure Demand and Savings Deposit Liabilities, Fair Value Disclosure Time Deposit Liabilities, Fair Value Disclosure Time Deposit Liabilities, Fair Value Disclosure Time Deposit Liabilities, Fair Value Disclosure Short-term borrowings Short-term Debt, Fair Value Accrued interest payable Accounts Payable and Accrued Liabilities, Fair Value Disclosure Other Financial Liabilities Other Financial Liabilites, Fair Value Disclosure Other financial liabilities – Included within this category are: Level 1 employee deferred compensation liabilities which represent amounts due to employees under the deferred compensation plans, described under the heading “Other financial assets” above and Level 2 mortgage banking derivatives, described under the heading “Other financial assets” above. Federal Home Loan Bank Advances And Debt Long Term, Fair Value Disclosre Federal Home Loan Bank Advances And Debt Long Term, Fair Value Disclosre Federal Home Loan Bank Advances And Debt Long Term, Fair Value Disclosre Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Axis] Antidilutive Securities [Axis] Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Stock Option [Member] Equity Option [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 Subsequent Events [Abstract] Subsequent Event [Table] Subsequent Event [Table] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Subsequent Event [Member] Subsequent Event [Member] Subsequent Event [Line Items] Subsequent Event [Line Items] Cash dividends per share Common Stock, Dividends, Per Share, Declared Summary of Changes in Mortgage Servicing Rights Servicing Asset at Amortized Cost [Table Text Block] External Credit Rating by Grouping [Axis] External Credit Rating by Grouping [Axis] External Credit Rating by Grouping [Domain] External Credit Rating by Grouping [Domain] External Credit Rating, Rated Above Investment Grade [Member] External Credit Rating, Rated Above Investment Grade [Member] External Credit Rating, Rated Above Investment Grade [Member] External Credit Rating, Rated Below Investment Grade [Member] External Credit Rating, Rated Below Investment Grade [Member] External Credit Rating, Rated Below Investment Grade [Member] Credit Rating, Moody's [Axis] Credit Rating, Moody's [Axis] External Credit Rating, Moody's [Domain] External Credit Rating, Moody's [Domain] Moody's, A2 Rating [Member] Moody's, A2 Rating [Member] Moody's, A3 Rating [Member] Moody's, A3 Rating [Member] External Credit Rating, BBB [Member] External Credit Rating, BBB [Member] External Credit Rating, BBB [Member] Equity Securities Financial Institution [Member] Equity Securities Financial Institution [Member] Equity Securities, Other [Member] Other Equity Securities [Member] Other Equity Securities [Member] Pooled Trust Preferred Securities [Member] Single-issuer Trust Preferred Securities [Member] Available-for-sale Securities Pledged as Collateral Available-for-sale Securities Pledged as Collateral Available-for-sale Securities, Equity Securities Available-for-sale Securities, Equity Securities Amortized cost Available-for-sale Securities, Amortized Cost Basis Single Bank Stock Investment, cost basis Single Bank Stock Investment, cost basis Investment in the common stock of an individual financial institution, at cost. Single Bank Stock Investment, Fair Value BankStockInvestmentFairValue Investment in the common stock of an individual financial institution, at fair value. Percent Ownership In An Individual Financial Institution Percent Ownership In An Individual Financial Institution Fair value of ownership in a single financial institution as a percentage of the Corporation's entire financial institutions stock portfolio. IndividualBankStockInvestmentPercenttoTotalPortfolio IndividualBankStockInvestmentPercenttoTotalPortfolio Percentage which none of the fair values of Corporation's individual bank stock investments exceed the fair value of the entire portfolio. Carrying Value Action Rate Securities Above Investment Grade Carrying Value Action Rate Securities Above Investment Grade Carrying Value Action Rate Securities Above Investment Grade Percentage Action Rate Securities Above Investment Grade Percentage Action Rate Securities Above Investment Grade Percentage Action Rate Securities Above Investment Grade Carrying Value Auction Rate Securities Rated Investment Grade Carrying Value Auction Rate Securities Rated Investment Grade Carrying value of auction rate securities with credit ratings of AAA. Percentage Auction Rate Securities Investment Grade Percentage Auction Rate Securities Investment Grade Percentage of auction rate securities with credit ratings of AAA. Carrying value auction rate securities below investment grade Carrying Value Auction Rate Securities Below Investment Grade Carrying Value Action Rate Securities rated below investment grade or not rated by any ratings agency. Percentage Auction Rate Securities Below Investment Grade Percentage Auction Rate Securities Below Investment Grade Percentage of Auction Rate Securities rated below investment grade or not rated by any ratings agency. US Government Guaranteed student loans below investment grade Guaranteed Student Loans Below Investment Grade This represents amount of below investment grade-rated auction rate securities whose principal payments are guaranteed by the Federal government. US Government Guaranteed student loan auction rate securities Guaranteed Student Loan Auction Rate Securities This element represents the carrying value of student loan auction rate securities guaranteed by the U.S. government US Government Guaranteed student loan auction rate securities percentage Guaranteed Student Loan Auction Rate Securities Percentage Guaranteed Student Loan Auction Rate Securities Percentage Proceeds from Sale of Available-for-sale Securities Available-for-sale Securities, Sold at Par Auction Rate Certificates Not Subject To Any Additional Other Than Temporary Impairment Charges Fair Value Auction Rate Certificates Not Subject To Any Additional Other Than Temporary Impairment Charges Fair Value Auction Rate Certificates Not Subject To Any Additional Other Than Temporary Impairment Charges Fair Value Unrealized Loss on Securities Unrealized Gain (Loss) on Securities Number of Trust Preferred Securities Number of Trust Preferred Securities Number of Trust Preferred Securities Number of Trust Preferred Securities Not Rated Number of Trust Preferred Securities Not Rated Number of Trust Preferred Securities Not Rated Number of Securities Sold Number of Securities Sold Number of Securities Sold Available-for-sale Securities, Gross Realized Gains (Losses), Cost Basis of Securities Sold Available-for-sale Securities, Gross Realized Gains (Losses), Cost Basis of Securities Sold Available-for-sale Securities, Gross Realized Gains (Losses), Cost Basis of Securities Sold Net gains on sales of investment securities Gain (Loss) on Sale of Securities, Net Domestic Corporate debt securities Domestic Corporate Debt Securities The fair value as of the balance sheet date of firm holdings in debt obligations issued by corporate entities. Major Types of Debt and Equity Securities [Domain] Municipal Bonds [Member] Municipal Bonds [Member] Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Summary of Compensation Expense and Related Tax Benefits Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] Schedule of Investments [Table] Schedule of Available-for-sale Securities [Table] Corporate Debt Securities Issued by Financial Institutions [Member] Domestic Corporate Debt Securities [Member] Subordinated Debt [Member] Subordinated Debt [Member] Other Corporate Debt Securities [Member] Other Corporate Debt Securities [Member] Other Corporate Debt Securities [Member] Schedule of Available-for-sale Securities [Line Items] Schedule of Available-for-sale Securities [Line Items] Basis of Presentation Business Description and Basis of Presentation [Text Block] Statement [Table] Statement [Table] Statement, Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Unrealized Gains on Investment Securities Not Other-Than-Temporarily Impaired [Member] Accumulated Net Unrealized Investment Gain (Loss) [Member] Unrealized Non-Credit Losses on Other-Than-Temporarily Impaired Debt Securities [Member] Accumulated Other-than-Temporary Impairment [Member] Unrealized Effective Portions of Losses on Forward-Starting Interest Rate Swaps [Member] Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] Unrecognized Pension and Postretirement Plan Income (Costs) [Member] Accumulated Defined Benefit Plans Adjustment [Member] Statement [Line Items] Statement [Line Items] Accumulated Other Comprehensive Income [Roll Forward] Accumulated Other Comprehensive Income [Roll Forward] Accumulated Other Comprehensive Income [Roll Forward] Beginning Balance Accumulated Other Comprehensive Income (Loss), Net of Tax Other comprehensive income (loss) before reclassifications Other Comprehensive Income (Loss), before Reclassifications, Net of Tax Amounts reclassified from accumulated other comprehensive income (loss) Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Ending Balance Statement of Stockholders' Equity [Abstract] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Home Equity [Member] Allowance for loan losses measured for impairment under FASB ASC Subtopic 450-20 Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment Allowance for loan losses evaluated for impairment under FASB ASC Section 310-10-35 Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment Allowance for loan losses Loans, net of unearned income, measured for impairment under FASB ASC Subtopic 450-20 Financing Receivable, Collectively Evaluated for Impairment Loans, net of unearned income, evaluated for impairment under FASB ASC Subtopic 310-10-35 Financing Receivable, Individually Evaluated for Impairment Percentage of unallocated allowance Percentage of Unallocated Allowance Percentage of Unallocated Allowance Common Stock [Member] Common Stock [Member] Additional Paid-In Capital [Member] Additional Paid-in Capital [Member] Retained Earnings [Member] Retained Earnings [Member] Accumulated Other Comprehensive Income [Member] Accumulated Other Comprehensive Income (Loss) [Member] Treasury Stock [Member] Treasury Stock [Member] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Beginning Balance Stockholders' Equity Attributable to Parent Beginning Balance (in shares) Shares, Outstanding Other comprehensive income (loss) Stock issued, including related tax benefits Stock Issued During Period, Value, New Issues Stock issued, including related tax benefits (in shares) Stock Issued During Period, Shares, New Issues Stock-based compensation awards Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Acquisition of treasury stock (in shares) Treasury Stock, Shares, Acquired Acquisition of treasury stock Treasury Stock, Value, Acquired, Cost Method Common stock cash dividends Dividends, Common Stock, Cash Ending Balance Ending Balance (in shares) Schedule of Fair Value, Off-balance Sheet Risks [Table] Schedule of Fair Value, Off-balance Sheet Risks [Table] Fair Value, Off-balance Sheet Risks by Financial Instrument [Axis] Fair Value, Off-balance Sheet Risks, Financial Instruments [Domain] Commitments to Extend Credit [Member] Commitments to Extend Credit [Member] Standby Letters of Credit [Member] Standby Letters of Credit [Member] Commercial Letters of Credit [Member] Commercial Letters of Credit [Member] An irrevocable undertaking (typically by a financial institution) to guarantee payment of a specified financial obligation. Valuation Allowances and Reserves Type [Axis] Valuation Allowances and Reserves [Domain] Reserve for Off-balance Sheet Activities [Member] Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] Valuation allowances and Reserves, Balance Valuation Allowances and Reserves, Balance Residential Mortgage Principal Balance Repurchase Request Received ResidentialMortgagePrincipalBalanceRepurchaseRequestReceived ResidentialMortgagePrincipalBalanceRepurchaseRequestReceived Residential Mortgage, Settlement Agreement, Amount Residential Mortgage, Settlement Agreement, Amount Residential Mortgage, Settlement Agreement, Amount Residential Mortgage, Settlement Agreement Resulting in Reduction to Outstanding Repurchase Request Residential Mortgage, Settlement Agreement Resulting in Reduction to Outstanding Repurchase Request Residential Mortgage, Settlement Agreement Resulting in Reduction to Outstanding Repurchase Request Residential Mortgage, Settlement Agreement Resulting in Reduction to Reserves for Repurchase Residential Mortgage, Settlement Agreement Resulting in Reduction to Reserves for Repurchase Residential Mortgage, Settlement Agreement Resulting in Reduction to Reserves for Repurchase Decrease in Operating Risk Loss Decrease in Operating Risk Loss Decrease in Operating Risk Loss Residential Mortgage Principal Balance FHLB Credit Enhancement ResidentialMortgagePrincipalBalanceFHLBCreditEnhancement ResidentialMortgagePrincipalBalanceFHLBCreditEnhancement Residential Mortgage Repurchase Reserves FHLB Credit Enhancement ResidentialMortgageRepurchaseReservesFHLBCreditEnhancement ResidentialMortgageRepurchaseReservesFHLBCreditEnhancement Statement of Cash Flows [Abstract] Statement, Scenario [Axis] Scenario [Axis] Scenario, Unspecified [Domain] Scenario, Unspecified [Domain] CASH FLOWS FROM OPERATING ACTIVITIES: Net Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net income to net cash provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Depreciation and amortization of premises and equipment Depreciation, Depletion and Amortization, Nonproduction Net amortization of investment securities premiums Accretion (Amortization) of Discounts and Premiums, Investments Investment securities gains, net Gain (Loss) on Investments Net (increase) decrease in loans held for sale Increase (Decrease) in Loans Held-for-sale Amortization of intangible assets Amortization of Intangible Assets Stock-based compensation Allocated Share-based Compensation Expense Excess tax benefits from stock-based compensation Excess Tax Benefit from Share-based Compensation, Operating Activities Decrease in accrued interest receivable Increase (Decrease) in Accrued Interest Receivable, Net (Increase) decrease in other assets Increase (Decrease) in Other Operating Assets Increase (decrease) in accrued interest payable Increase (Decrease) in Interest Payable, Net Decrease in other liabilities Increase (Decrease) in Other Operating Liabilities Total adjustments Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities 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 Proceeds from Sale of Available-for-sale Securities Proceeds from maturities of securities held to maturity Proceeds from Maturities, Prepayments and Calls of Held-to-maturity Securities Proceeds from maturities of securities available for sale Proceeds from Maturities, Prepayments and Calls of Available-for-sale Securities Purchase of securities available for sale Payments to Acquire Available-for-sale Securities Increase in short-term investments Payments for (Proceeds from) Short-term Investments Net increase in loans Payments for (Proceeds from) Loans and Leases Net purchases of premises and equipment Payments for (Proceeds from) Productive Assets Net cash 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] Net increase in demand and savings deposits Increase (Decrease) in Demand Deposits Net increase (decrease) in time deposits Increase (Decrease) in Time Deposits (Decrease) increase in short-term borrowings Proceeds from (Repayments of) Short-term Debt Additions to long-term debt Proceeds from Issuance of Long-term Debt Repayments of long-term debt Repayments of Long-term Debt Net proceeds from issuance of common stock Proceeds from Issuance of Common Stock Excess tax benefits from stock-based compensation Excess Tax Benefit from Share-based Compensation, Financing Activities Dividends paid Payments of Dividends Acquisition of treasury stock Payments for Repurchase of Common Stock Net cash provided by financing activities Net Cash Provided by (Used in) Financing Activities Net Increase in Cash and Due From Banks Cash and Cash Equivalents, Period Increase (Decrease) Cash and Due From Banks at Beginning of Period Cash and Due from Banks Cash and Due From Banks at End of Period Supplemental Disclosures of Cash Flow Information: Supplemental Cash Flow Information [Abstract] Cash paid during the period for: Cash Paid During Period For Abstract Cash Paid During Period For [Abstract] Interest Interest Paid Income taxes Income Taxes Paid Summary of Gross Loans by Type Schedule Of Gross Loans [Table Text Block] Schedule Of Gross Loans [Text Block] Schedule of Allowance for Credit Losses Schedule of Allowance for Credit Losses [Table Text Block] Schedule of the components of the allowance for credit losses as of the balance sheet date. Activity in the Allowance for Credit Losses Allowance for Credit Losses on Financing Receivables [Table Text Block] Total Impaired Loans by Class Segment Impaired Financing Receivables [Table Text Block] Financing Receivable Credit Quality Indicators Financing Receivable Credit Quality Indicators [Table Text Block] Non-Performing Assets Schedule of Non Performing Assets [Table Text Block] Schedule of Non Performing Assets [Text Block] Troubled Debt Restructurings on Financing Receivables Troubled Debt Restructurings on Financing Receivables [Table Text Block] Loan Terms Modified Under Troubled Debt Restructurings Schedule of Loans Modified Under Troubled Debt Restructurings [Table Text Block] Schedule of Loans Modified Under Troubled Debt Restructurings [Text Block] Past due Loan Status and Non-Accrual Loans by Portfolio Segment Past Due Financing Receivables [Table Text Block] Income Statement [Abstract] INTEREST INCOME Interest and Dividend Income, Operating [Abstract] Loans, including fees Interest and Fee Income, Loans and Leases Investment securities: Interest and Dividend Income, Securities, by Taxable Status [Abstract] Taxable Interest Income, Securities, Operating, Taxable Tax-exempt Interest Income, Securities, Operating, Tax Exempt Dividends Dividend Income, Operating Loans held for sale Interest and Fee Income, Loans and Leases Held-for-sale Other interest income Other Interest and Dividend Income Total Interest Income Interest and Dividend Income, Operating INTEREST EXPENSE Interest Expense [Abstract] Deposits Interest Expense, Deposits Short-term borrowings Interest Expense, Short-term Borrowings Long-term debt Interest Expense, Long-term Debt Total Interest Expense Interest Expense Net Interest Income Interest Income (Expense), Net Net Interest Income After Provision for Credit Losses Interest Income (Expense), after Provision for Loan Loss NON-INTEREST INCOME Noninterest Income [Abstract] Service charges on deposit accounts Fees and Commissions, Depositor Accounts Investment management and trust services Fees and Commissions, Fiduciary and Trust Activities Other service charges and fees Fees and Commissions, Other Mortgage banking income Mortgage banking income This element represents total mortgage banking income from the sale of and valuation loans held for sale, including third party loan servicing fees. Other Noninterest Income, Other Operating Income Other-than-temporary impairment losses Other than Temporary Impairment Losses, Investments Less: Portion of gain recognized in other comprehensive income (loss) (before taxes) Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Loss, before Tax, Portion Attributable to Parent Net other-than-temporary impairment losses Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net Investment securities gains, net Net Securities Gain Loss This item represents the total realized gain (loss) included in earnings for the period as a result of selling marketable securities categorized as available-for-sale or held-to-maturity. Additionally, this item would include any losses recognized for other than temporary impairments of the subject investments in debt and equity securities. Total Non-Interest Income Noninterest Income NON-INTEREST EXPENSE Noninterest Expense [Abstract] Salaries and employee benefits Labor and Related Expense Net occupancy expense Occupancy, Net Other outside services Other outside services Includes consulting services, employment agency fees and other contracted third-party services. Data processing Information Technology and Data Processing Software Software Software Expenses Equipment expense Equipment Expense Professional fees Professional Fees FDIC insurance expense Federal Deposit Insurance Corporation Premium Expense Marketing Marketing Expense Other real estate owned and repossession expense Other Real Estate Owned And Repossession Expense Other Real Estate Owned And Repossession Expense Operating risk loss Operating Risk Loss Operating risk loss consists of losses incurred in the conduct of normal banking operations. Intangible amortization Other Other Noninterest Expense Total Non-Interest Expense Noninterest Expense Income Before Income Taxes Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest Income taxes Income Tax Expense (Benefit) Net Income PER SHARE: PER COMMON SHARE Per Common Share [Abstract] Net Income (Basic) (in dollars per share) Earnings Per Share, Basic Net Income (Diluted) (in dollars per share) Earnings Per Share, Diluted Cash Dividends (in dollars per share) Derivative Fair Value Position [Axis] Derivative Fair Value Position [Axis] Positive Fair Values [Member] Positive fair values [Member] Negative Fair Values [Member] Negative fair values [Member] Foreign Currency Open Position Foreign Currency Open Position TotalopenforeigncurrencypositionperCorporatepolicy. Derivative, Notional Amount Derivative, Notional Amount Asset, Fair Value Interest Rate Derivative Assets, at Fair Value Liability, Fair Value Interest Rate Derivative Liabilities, at Fair Value Asset (Liability) Fair Value Interest Rate Derivatives, at Fair Value, Net Foreign Currency Contract, Asset, Fair Value Disclosure Foreign Currency Contract, Asset, Fair Value Disclosure Foreign Currency Contracts, Liability, Fair Value Disclosure Foreign Currency Contracts, Liability, Fair Value Disclosure Derivative, Fair Value, Net Derivative, Fair Value, Net Stock-based compensation expense Tax benefit Employee Service Share-based Compensation, Tax Benefit from Compensation Expense Stock-based compensation expense, net of tax Allocated Share-based Compensation Expense, Net of Tax Schedule of Financing Receivable, Troubled Debt Restructurings [Table] Financing Receivable, Troubled Debt Restructuring [Axis] Financing Receivable, Troubled Debt Restructuring [Domain] Consumer Other Financing Receivable [Member] Financing Receivable, Modifications [Line Items] Accruing TDRs Accruing Troubled Debt Restructurings Accruing Troubled Debt Restructurings Non-accrual TDRs Non-accrual Troubled Debt Restructurings Non-accrual Troubled Debt Restructurings Total TDRs Total Troubled Debt Restructurings Total Troubled Debt Restructurings Statement of Financial Position [Abstract] ASSETS Assets [Abstract] Cash and due from banks Interest-bearing deposits with other banks Interest-bearing Deposits in Banks and Other Financial Institutions Federal Reserve Bank and Federal Home Loan Bank stock Restricted Investments Loans held for sale Loans, net of unearned income Less: Allowance for loan losses Net Loans Loans and Leases Receivable, Net Amount Premises and equipment Property, Plant and Equipment, Net Accrued interest receivable Interest Receivable Goodwill and intangible assets Goodwill Other assets Other Assets Total Assets Assets LIABILITIES Liabilities [Abstract] Noninterest-bearing Noninterest-bearing Deposit Liabilities Interest-bearing Interest-bearing Deposit Liabilities Total Deposits Deposits Short-term borrowings: Short-term Debt [Abstract] Federal funds purchased Federal Funds Purchased Other short-term borrowings Other Short-term Borrowings Total Short-Term Borrowings Short-term Debt Accrued interest payable Interest Payable Other liabilities Other Liabilities Federal Home Loan Bank advances and long-term debt Federal Home Loan Bank Advances And Debt Long Term Including both current and noncurrent portions, Federal Home Loan Bank borrowings initially due beyond one year or beyond the normal operating cycle if longer. Also including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date. May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any. Total Liabilities Liabilities SHAREHOLDERS’ EQUITY Stockholders' Equity Attributable to Parent [Abstract] Common stock, $2.50 par value, 600 million shares authorized, 218.1 million shares issued in 2014 and 217.8 million shares issued in 2013 Common Stock, Value, Issued Additional paid-in capital Additional Paid in Capital Retained earnings Retained Earnings (Accumulated Deficit) Accumulated other comprehensive loss Treasury stock, at cost, 32.9 million shares in 2014 and 25.2 million shares in 2013 Treasury Stock, Value Total Shareholders’ Equity Total Liabilities and Shareholders’ Equity Liabilities and Equity Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Maximum [Member] Maximum [Member] Minimum [Member] Minimum [Member] Minimum balance of loans evaluated individually for impairment Impaired Loan Balances Allocated Reserves Represents the maximum balance of impaired loans that are pooled and evaluated collectively for impairment, rather than individually evaluated for impairment. Impaired loans with principal balances approximately in percentage Impaired Loans with Principal Balances Approximately In Percentage Percentage of impaired loans primarily collateralized by real estate with principal balances greater than $1 million that were measured at estimated fair value using certified third party appraisals that had been updated in the previous 12 months. Impaired loans balances, real estate as collateral Impaired Loans Balances, Real Estate as Collateral Represents the minimum principal balance threshold for disclosing impaired loans primarily secured by real estate that were measured at estimated fair value using certified third party appraisals updated in the previous 12 months. Loan to value ratio in the Corporation's policy Loan to Value Ratio in the Corporation's Policy Loan to Value Ratio in the Corporation's Policy TDR additional commitments to lend TDR Additional Commitments To Lend TDR Additional Commitments To Lend Non-accrual loans Loans and Leases Receivable, Nonperforming, Nonaccrual of Interest Accruing loans greater than 90 days past due Total non-performing loans Non-Performing Loans Total non-accrual loans and accruing loans 90 days or more past due as of the balance sheet date. Other real estate owned (OREO) Other Real Estate, Foreclosed Assets, and Repossessed Assets Total non-performing assets Non-performing Assets Non-accrual loans and accruing loans 90 days or more past due as of the balance sheet date. Fair Value Measurements Fair Value Disclosures [Text Block] Weighted Average Number of Shares Outstanding Reconciliation [Abstract] Weighted average shares outstanding (basic) Weighted Average Number of Shares Outstanding, Basic Impact of common stock equivalents Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Weighted average shares outstanding (diluted) Weighted Average Number of Shares Outstanding, Diluted Accumulated Other Comprehensive Income Comprehensive Income (Loss) Note [Text Block] Fair Value, Measurements, Nonrecurring [Member] Net loans Impaired Financing Receivable, Net of Allowance, Fair Value Disclosure Net loans, individually measured for impairment under FASB ASC Section 310-10-35 on a non-recurring basis using predominately unobservable inputs and net loans purchased from third parties, also measured at fair value on a non-recurring basis, using predominately observable inputs for similar assets. Other financial assets Other Financial Assets, Fair Value Disclosure Other Financial Assets, Fair Value Disclosure Leasing and other [Member] Finance Leases Portfolio Segment [Member] Overdrafts [Member] Bank Overdrafts [Member] Loans, gross of unearned income Loans and Leases Receivable, Gross Unearned income Loans and Leases Receivable, Deferred Income Internal Credit Assessment [Axis] Performing Financing Receivable [Member] Performing Financing Receivable [Member] Delinquent [Member] Delinquent [Member] Delinquent [Member] Nonperforming Financing Receivable [Member] Nonperforming Financing Receivable [Member] Class of Financing Receivable [Domain] Real Estate, Home Equity, Construction, Other, Consumer and Leasing [Member] Real Estate, Home Equity, Construction, Other, Consumer and Leasing [Member] Real Estate, Home Equity, Construction, Other, Consumer and Leasing [Member] Loans And Leases Receivable Percentage Of Loans Within Delinquecy Category By Total Non Risk Rated Loans Loans And Leases Receivable Percentage Of Loans Within Delinquecy Category By Total Non Risk Rated Loans Percentage of loans within delinquency category by total non-risk rated loans Days past due Financing Receivable, Recorded Investment, Days Outstanding Financing Receivable, Recorded Investment, Days Outstanding Summary of Corporation's Mortgage Loans Held for Sale Fair Value, Option, Qualitative Disclosures Related to Election [Table Text Block] Subsequent Event Subsequent Events [Text Block] Stock-Based Compensation Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Award Type [Axis] Award Type [Axis] Equity Award [Domain] Equity Award [Domain] Performance Shares [Member] Performance Shares [Member] Restricted Stock Units (RSUs) [Member] Restricted Stock Units (RSUs) [Member] Employee Stock Option [Member] Employee Stock Option [Member] Plan Name [Axis] Plan Name [Axis] Plan Name [Domain] Plan Name [Domain] Directors' Plan [Member] Directors' Plan [Member] Directors Plan [Member] Statement [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share Based Compensation Arrangement By Share Based Payment Award Options Expiration Term Share Based Compensation Arrangement By Share Based Payment Award Options Expiration Term Share Based Compensation Arrangement By Share Based Payment Award Options Expiration Term 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, Options, Grants in Period, Net of Forfeitures Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 1 Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Shares reserved for future grants under the stock option and compensation plan Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Outstanding Options 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] Schedule of Changes in Assets and Liabilities Measured at Fair Value on a Recurring Basis using Level 3 Inputs Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Fair Value, Assets and Liabilities Measured on Nonrecurring Basis Fair Value Measurements, Nonrecurring [Table Text Block] Details of Book Value and Fair Value of Financial Instruments Fair Value, by Balance Sheet Grouping [Table Text Block] Fair Value Option Fair Value, Option [Text Block] Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Statement of Financial Position [Abstract] Common stock, par value Common Stock, Par or Stated Value Per Share Common stock, shares authorized Common Stock, Shares Authorized Common stock, shares issued Common Stock, Shares, Issued Treasury stock, shares Treasury Stock, Shares Balance Sheet Offsetting Offsetting Derivative Asset And Liability [Text Block] Offsetting Derivative Asset And Liability [Text Block] Fair Value, Option, Qualitative Disclosures Related to Election [Table] Fair Value, Option, Qualitative Disclosures Related to Election [Table] Fair Value by Liability Class [Axis] Liability Class [Axis] Fair Value, Liabilities, Measured on Recurring Basis, Unobservable Input Reconciliation, by Liability Class [Domain] Fair Value by Liability Class [Domain] Trust for Benefit of Employees [Member] Trust for Benefit of Employees [Member] Fair Value by Asset Class [Axis] Asset Class [Axis] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, by Asset Class [Domain] Asset Class [Domain] Forward Contracts [Member] Financial Institutions Subordinated Debt [Member] Financial Institutions Subordinated Debt [Member] Financial Institutions Subordinated Debt Other Corporate Debt [Member] Other Corporate Debt [Member] Other corporate debt issued by non-financial institutions. Fair Value, Equity Securities, Value Test Coverage, Percent Fair Value, Equity Securities, Value Test Coverage, Percent Percentage of values provided by alternative third party source(s) undergoing additional research. Fair Value, Equity Securities, Fair Value Price Difference Threshold, Percent Fair Value, Equity Securities, Fair Value Price Difference Threshold, Percent Differences by security in excess of of threhold are researched to reconcile the difference. Corporate debt securities Significant Input, Assumed Market Return to Liquidity, Years Significant Input, Assumed Market Return to Liquidity, Years Significant Input, Assumed Market Return to Liquidity, Years Other financial assets Other financial assets Item represents the book value and estimated fair values of financial instruments catagorized within the other liabilities line item on the consolidated balance sheet. Other financial liabilities Other financial liabilities Item represents the book value and estimated fair values of financial instruments catagorized within the other liabilities line item on the consolidated balance sheet. Servicing Asset at Amortized Value, Fair Value Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Prepayment Speed Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Prepayment Speed Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Discount Rate Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Discount Rate Short Term Borrowings, Reprice Period, In Days Short Term Borrowings, Reprice Period, In Days Short Term Borrowings, Reprice Period, In Days Amortized Cost Gross Unrealized Gains Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax Gross Unrealized Losses Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax Estimated Fair Value Employee Benefit Plans Pension and Other Postretirement Benefits Disclosure [Text Block] Schedule of Financing Receivable, Troubled Debt Restructurings [Table] Financing Receivable, Troubled Debt Restructurings [Axis] Financing Receivable, Troubled Debt Restructurings [Domain] Financing Receivable, Modifications [Line Items] Financing Receivable, Modifications, Number of Contracts Financing Receivable, Modifications, Number of Contracts Financing Receivable, Modifications, Post-Modification Recorded Investment Financing Receivable, Modifications, Post-Modification Recorded Investment 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 Common Stock Repurchase Plan Share Repurchase Plan [Text Block] Share Repurchase Plan [Text Block] Reconciliation of Weighted Average Common Shares Outstanding Schedule of Weighted Average Number of Shares [Table Text Block] Defined Benefit Plans Disclosures [Table] Schedule of Defined Benefit Plans Disclosures [Table] Defined Benefit Plans Disclosures, Defined Benefit Plans [Axis] Defined Benefit Plans and Other Postretirement Benefit Plans [Axis] Defined Benefit Plans [Domain] Defined Benefit Plan and Other Postretirement Benefit Plan [Domain] Pension Plan [Member] Pension Plan [Member] Postretirement Plan [Member] Other Postretirement Benefit Plan [Member] Define Benefit Plan Disclosure [Line Items] Defined Benefit Plan Disclosure [Line Items] Service cost Defined Benefit Plan, Service Cost Interest cost Defined Benefit Plan, Interest Cost Expected return on plan assets Defined Benefit Plan, Expected Return on Plan Assets Net amortization and deferral Defined Benefit Plan, Amortization of Gains (Losses) Net accretion and deferral Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Net periodic benefit cost Defined Benefit Plan, Net Periodic Benefit Cost Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments Defined Benefit Plan, Curtailments Defined Benefit Plan, Curtailments Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Summary of Notional Amounts and Fair Values of Derivative Financial Instruments Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Summary of Fair Value Gains and Losses on Derivative Financial Instruments Derivative Instruments, Gain (Loss) [Table Text Block]