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Award vesting period Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Stock-based compensation expense APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Consolidation Items [Axis] Consolidation Items [Axis] Interest and dividends on securities: Interest and Dividend Income, Securities, by Taxable Status [Abstract] 2-3 years Lessee, Operating Lease, Liability, to be Paid, Year Two Due after 10 years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 Net interest income after provision for (release of) credit losses Interest Income (Expense), after Provision for Loan Loss Marketable Securities [Table] Marketable Securities [Table] Provision for (release of) credit losses Financing Receivable, Credit Loss, Expense (Reversal) Corporate bonds Corporate Debt Securities [Member] Class of Financing Receivable [Axis] Class of Financing Receivable [Axis] Schedule of Operating Lease 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Trade name Trade Names [Member] Retirement Plan Type [Axis] Retirement Plan Type [Axis] Intangible assets acquired Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets Acquired Including Goodwill Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets Acquired Including Goodwill Equity [Abstract] Equity [Abstract] Vested (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Entity Tax Identification Number Entity Tax Identification Number Number of shares authorized (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized Customer lists Customer Lists [Member] Touchpoint Touchpoint [Member] Touchpoint Amortized Cost Debt Securities, Available-for-Sale, Amortized Cost, Fiscal Year Maturity [Abstract] Beginning balance (in shares) Ending balance (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding, Number Schedule of Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Expected amortization, remainder of fiscal year Finite-Lived Intangible Asset, Expected Amortization, Remainder of Fiscal Year Financial fees Financial Fees [Member] Financial Fees Other Revenue Not from Contract with Customer, Other Current Financial Asset, Not Past Due [Member] Effect of dilutive restricted stock and stock appreciation rights (in shares) Weighted Average Number of Shares Outstanding, Diluted, Adjustment Contingent consideration, measurement input Business Combination, Contingent Consideration, Liability, Measurement Input Other intangible assets, net Other Intangible Assets, Net Entity Central Index Key Entity Central Index Key Amortization expense, rolling year four Finite-Lived Intangible Assets, Amortization Expense, Rolling Year Four Fair Value Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Number of troubled debt restructured loans Financing Receivable, Modifications, Number of Contracts Interest-bearing Interest-Bearing Deposit Liabilities Number of shares authorized to be repurchased (in shares) Stock Repurchase Program, Number of Shares Authorized to be Repurchased Measurement Input Type [Axis] Measurement Input Type [Axis] Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] City Area Code City Area Code Assets Assets [Abstract] Retirement Benefits [Abstract] Retirement Benefits [Abstract] Deposits: Deposits, by Type [Abstract] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Noninterest-bearing Noninterest-Bearing Deposit Liabilities Proceeds from maturities of securities available-for-sale Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-Sale Allowance for unfunded commitments Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments Interest Expense: Interest Expense [Abstract] Net change in accounts and drafts payable and other customer receivables Increase In Accounts and Drafts Payable Net change during the reporting period in the carrying amount of accounts and drafts payable. Cash Flows From Financing Activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Remaining number of shares authorized to be repurchased (in shares) Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased Stock-based compensation expense Share-Based Payment Arrangement, Noncash Expense Equipment Equipment Expense Total operating expense Noninterest Expense Other operating expense Other Noninterest Expense Fair Value Debt Securities, Available-for-Sale, Fair Value, Fiscal Year Maturity [Abstract] Purchases of premises and equipment, net Payments to Acquire Property, Plant, and Equipment Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Schedule of Earnings Per Share, Basic and Diluted Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Available-for-sale securities, gross realized losses Debt Securities, Available-for-Sale, Realized Loss