Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
OPERATING ACTIVITIES
Net Income	$ 57,910us-gaap_NetIncomeLoss	$ 50,539us-gaap_NetIncomeLoss	$ 34,200us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	1,715us-gaap_ProvisionForLoanAndLeaseLosses	8,311us-gaap_ProvisionForLoanAndLeaseLosses	22,815us-gaap_ProvisionForLoanAndLeaseLosses
Provision for Other Losses	(655)us-gaap_ProvisionForOtherCreditLosses	(60)us-gaap_ProvisionForOtherCreditLosses	1,811us-gaap_ProvisionForOtherCreditLosses
Depreciation and amortization	4,703	5,333	7,000
Net amortization of discounts and premiums	3,680	3,826	2,280
Stock-based compensation expense	975us-gaap_ShareBasedCompensation	687us-gaap_ShareBasedCompensation	913us-gaap_ShareBasedCompensation
Securities (gains) losses, net	(41)us-gaap_GainLossOnSaleOfSecuritiesNet	(5)us-gaap_GainLossOnSaleOfSecuritiesNet	(3,016)us-gaap_GainLossOnSaleOfSecuritiesNet
Net gain on sale of merchant card servicing business	0us-gaap_GainLossOnSaleOfBusiness	(3,093)us-gaap_GainLossOnSaleOfBusiness	0us-gaap_GainLossOnSaleOfBusiness
Tax (benefit) expense from stock-based compensation	(16)	(96)	30
Mortgage loans originated for sale	(42,842)	(66,695)	(104,924)
Proceeds from the sale of loans	42,361	87,932	86,886
Deferred income taxes	1,536us-gaap_DeferredIncomeTaxExpenseBenefit	(2,358)us-gaap_DeferredIncomeTaxExpenseBenefit	1,038us-gaap_DeferredIncomeTaxExpenseBenefit
Gain on sale of fixed assets	(33)us-gaap_GainLossOnDispositionOfAssets1
Gain on the sale of loans, net	(353)us-gaap_GainLossOnSaleOfMortgageLoans	(874)us-gaap_GainLossOnSaleOfMortgageLoans	(1,612)us-gaap_GainLossOnSaleOfMortgageLoans
Net (increase) decrease in interest receivable	(933)	(130)	973
Net decrease in interest payable	(127)	(2,005)	(1,376)
Net decrease in other assets	7,628	25,681	18,815
Net increase (decrease) in other liabilities	2,595	(20,917)	18,057
Net Cash Provided by Operating Activities	78,103	86,076	83,890
INVESTING ACTIVITIES
Purchases of securities available-for-sale	57,092	66,744	87,604
Proceeds from sales of securities available-for-sale	1,418	94	66,575
Purchases of securities available-for-sale	(181,213)	(144,752)	(166,786)
Net proceeds from the redemption of Federal Home Loan Bank stock	(1,506)	1,685	5,700
Net (increase) decrease in loans	(313,264)	(241,172)	(21,892)
Proceeds from the sale of loans not originated for resale	5,408	5,158	3,874
Purchases of premises and equipment	(5,079)	(2,833)	(2,179)
Proceeds from the sale of premises and equipment	96	643	142
Net cash acquired from bank acquisitions			18,639
Proceeds from the sale of merchant card servicing business		4,750
Net Cash Used in Investing Activities	(437,048)	(309,683)	(8,323)
FINANCING ACTIVITIES
Net increase (decrease) in core deposits	240,948	(22,767)	207,653
Net (decrease) increase in certificates of deposit	(4,549)us-gaap_IncreaseDecreaseInTimeDeposits	56,174us-gaap_IncreaseDecreaseInTimeDeposits	(217,311)us-gaap_IncreaseDecreaseInTimeDeposits
Net increase (decrease) in short-term borrowings	150,000	65,000
Net (decrease) increase in securities sold under repurchase agreements	(3,242)	(28,735)	28,442
Proceeds from long-term borrowings			4,311
Repayments of long-term borrowings	(2,367)us-gaap_RepaymentsOfOtherLongTermDebt	(12,291)us-gaap_RepaymentsOfOtherLongTermDebt	(15,088)us-gaap_RepaymentsOfOtherLongTermDebt
Repayment of junior subordinated debt		(45,000)
Purchase of treasury shares	(163)	(88)	(49)
Sale of treasury shares			1,047us-gaap_ProceedsFromSaleOfTreasuryStock
Issuance costs	(271)us-gaap_PaymentsOfStockIssuanceCosts
Cash dividends paid to common shareholders	(20,203)us-gaap_PaymentsOfDividendsCommonStock	(18,137)us-gaap_PaymentsOfDividendsCommonStock	(17,357)us-gaap_PaymentsOfDividendsCommonStock
Tax benefit (expense) from stock-based compensation	16	96	(30)
Net Cash Provided by (Used in) Financing Activities	360,169	(5,748)	(8,382)
Net increase (decrease) in cash and cash equivalents	1,224	(229,355)	67,185
Cash and cash equivalents at beginning of year	108,356	337,711	270,526
Cash and Cash Equivalents at End of Year	109,580	108,356	337,711
Supplemental Disclosures
Transfers to other real estate owned and other repossessed assets	586us-gaap_TransferToOtherRealEstate	1,238us-gaap_TransferToOtherRealEstate	1,915us-gaap_TransferToOtherRealEstate
Interest paid	12,609us-gaap_InterestPaid	16,568us-gaap_InterestPaid	22,329us-gaap_InterestPaid
Income taxes paid, net of refunds	18,075us-gaap_IncomeTaxesPaidNet	13,130us-gaap_IncomeTaxesPaidNet	4,063us-gaap_IncomeTaxesPaidNet
Loans transferred to held for sale	0	5,158	19,255
Net assets (liabilities) from acquisitions, excluding cash and cash equivalents			$ (683)

Net assets acquired excluding cash and cash equivalents.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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The amount of cash paid for the origination of mortgages that are held for sale.

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Amount of cash outflow (inflow) from acquisition (sale) of Federal Home Loan Bank (FHLBank) stock.

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The net cash outflow or inflow for the increase (decrease) in the beginning and end of period of loan and lease balances which are not originated or purchased specifically for resale. Includes cash payments and proceeds associated with (a) loans held-for-investment, (b) leases held-for-investment, and (c) both.

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The cash outflow to reacquire common stock during the period.

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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 for cost incurred directly with the issuance of an equity security.

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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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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period.

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The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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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 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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The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

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The cash inflow from Sales of Loans Held For Investment.

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The cash inflow from sales of loans that are secured with real estate mortgages and are held with the intention to resell in the near future.

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The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

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The cash inflow from the issuance of an equity stock that has been previously reacquired by the entity.

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

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Amount of expense related to credit loss from transactions other than loan and lease transactions.

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The cash outflow attributable to repayments of borrowings not otherwise defined in the taxonomy (with maturities initially due after one year or beyond the 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 of loans and leases held in the entity's portfolio transferred to loans and leases held-for-sale in noncash transactions.

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

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