Consolidated Statements of Cash Flows (unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Operating activities
Net income	$ 18,166us-gaap_NetIncomeLoss	$ 18,009us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities
Provision for loan losses	3,642us-gaap_ProvisionForLoanAndLeaseLosses	3,596us-gaap_ProvisionForLoanAndLeaseLosses
Depreciation and amortization of premises and equipment	2,152us-gaap_DepreciationNonproduction	2,046us-gaap_DepreciationNonproduction
Net accretion on securities	531	921
Amortization of intangible assets	1,284us-gaap_AmortizationOfIntangibleAssets	1,310us-gaap_AmortizationOfIntangibleAssets
Stock based compensation	1,988us-gaap_ShareBasedCompensation	1,254us-gaap_ShareBasedCompensation
Increase in surrender value of bank owned life insurance	(1,559)	(1,382)
Purchases of trading securities	(492)	(1,043)
Unrealized gains on trading securities	20us-gaap_UnrealizedGainLossOnSecurities	(132)us-gaap_UnrealizedGainLossOnSecurities
Proceeds from sales of loans held for sale	7,111	439
Originations and purchases of loans held for sale	(7,297)	(1,418)
Net gains on sales of loans held for sale	(64)us-gaap_GainLossOnSaleOfLoansAndLeases	(3)us-gaap_GainLossOnSaleOfLoansAndLeases
Net security gains	(14)	(7)
Net gain on sales of other real estate owned	0	(102)
Net (increase) decrease in other assets	12,078	7,118
Net increase in other liabilities	(7,547)	1,156
Net cash provided by operating activities	29,999	31,762
Securities available for sale:
Proceeds from maturities, calls, and principal paydowns	61,153	67,341
Purchases	(114,445)	(70,339)
Securities held to maturity:
Proceeds from maturities, calls, and principal paydowns	19,752	5,107
Purchases	(18,907)	(5,217)
Other:
Net increase in loans	(33,206)	(78,304)
Proceeds from FHLB stock redemption	13,481	15,306
Purchases of Federal Reserve and FHLB stock	(8,617)	(9,900)
Proceeds from settlement of bank owned life insurance	1,468	573
Purchases of premises and equipment	(1,044)	(1,114)
Proceeds from the sale of other real estate owned	698	902
Net cash used in investing activities	(79,667)	(75,645)
Financing activities
Net increase in deposits	179,832us-gaap_IncreaseDecreaseInDeposits	178,674us-gaap_IncreaseDecreaseInDeposits
Net (decrease) increase in short-term borrowings	(123,630)	(99,164)
Repayments of long-term debt	(170)us-gaap_RepaymentsOfLongTermDebt	(144)us-gaap_RepaymentsOfLongTermDebt
Proceeds from the issuance of shares to employee benefit plans and other stock plans	(1,055)	362
Cash dividends and payment for fractional shares	(9,282)us-gaap_PaymentsOfDividendsCommonStock	(9,207)us-gaap_PaymentsOfDividendsCommonStock
Net cash provided by financing activities	45,695	70,521
Net increase in cash and cash equivalents	(3,973)	26,638
Cash and cash equivalents at beginning of period	146,636	158,926
Cash and cash equivalents at end of period	142,663	185,564
Cash paid during the period for:
Interest	5,803us-gaap_InterestPaid	6,829us-gaap_InterestPaid
Income taxes paid	872us-gaap_IncomeTaxesPaid	2,745us-gaap_IncomeTaxesPaid
Noncash investing activities:
Loans transferred to other real estate owned	$ 1,062us-gaap_TransferToOtherRealEstate	$ 460us-gaap_TransferToOtherRealEstate

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Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.

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The cash outflow to acquire debt and equity securities not classified as either held-to-maturity securities or trading securities which would be classified as available-for-sale securities and reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of shareholders' equity.

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Amount of cash outflow through purchase of long-term held-to-maturity securities.

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The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets.

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The cash inflow associated with the amount received from holders to acquire the entity's shares under incentive and share awards other than stock option exercises. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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No definition available.

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The cash inflow for proceeds from life insurance policies for which the entity is the beneficiary.

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The cash inflow associated with maturities (principal being due), prepayments and calls (requests of early payments) on securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities.

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The cash inflow associated with the maturity, prepayments and calls (requests for early payments) of debt securities designated as held-to-maturity.

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The net cash inflow or outflow for borrowing having initial term of repayment within one year or the normal operating cycle, if longer.

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Amount of cash inflow from sale of Federal Home Loan Bank (FHLB) stock.

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No definition available.

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The cash inflow resulting from the sale of loans classified as held-for-sale, including proceeds from loans sold through mortgage securitization.

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The cash inflow associated with the sale of other real estate not otherwise defined in the taxonomy.

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Amount of expense related to estimated loss from loan and lease transactions.

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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Value transferred from mortgage loans to real estate owned (REO) in noncash transactions.

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Amount of unrealized gain (loss) recognized in the income statement on unsold other securities.

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