Consolidated Statements of Cash Flow (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 63,887us-gaap_NetIncomeLoss	$ 54,317us-gaap_NetIncomeLoss	$ 51,900us-gaap_NetIncomeLoss
Adjustments to reconcile to net cash provided by operating activities:
Provision for loan losses	3,072us-gaap_ProvisionForLoanAndLeaseLosses	1,258us-gaap_ProvisionForLoanAndLeaseLosses	3,100us-gaap_ProvisionForLoanAndLeaseLosses
Depreciation and amortization	11,349	11,077	10,840
Net amortization of securities premiums and discounts	910	1,563	1,401
Realized securities gains	(1,641)us-gaap_GainLossOnSaleOfSecuritiesNet	(420)us-gaap_GainLossOnSaleOfSecuritiesNet	(4,915)us-gaap_GainLossOnSaleOfSecuritiesNet
Gain on sales of loans	(1,813)us-gaap_GainLossOnSalesOfLoansNet	(2,306)us-gaap_GainLossOnSalesOfLoansNet	(2,773)us-gaap_GainLossOnSalesOfLoansNet
Cash receipts from the sale of loans originated for sale	152,440	200,946	231,802
Cash disbursements for loans originated for sale	(153,592)	(193,853)	(230,666)
Deferred income tax benefit	(3,683)us-gaap_DeferredIncomeTaxExpenseBenefit	(483)us-gaap_DeferredIncomeTaxExpenseBenefit	(689)us-gaap_DeferredIncomeTaxExpenseBenefit
Gain on other assets	(760)us-gaap_GainLossOnSaleOfOtherAssets	(790)us-gaap_GainLossOnSaleOfOtherAssets	(232)us-gaap_GainLossOnSaleOfOtherAssets
(Increase)/decrease in interest receivable	(309)	284	2,686
Decrease in interest payable	(333)	(375)	(540)
Amortization of stock-based compensation arrangements	1,676us-gaap_ShareBasedCompensation	1,360us-gaap_ShareBasedCompensation	1,530us-gaap_ShareBasedCompensation
Other, net	5,719	5,512	(3,148)
Net cash provided by operating activities	76,922	78,090	60,296
INVESTING ACTIVITIES
Net cash and due from banks provided by acquisitions	174,283
Net decrease/(increase) in federal funds sold	4,619	700	(300)
Purchases of held for investment securities	(708)	(902)	(2,525)
Purchases of available for sale securities	(224,217)	(157,139)	(106,759)
Proceeds from maturities, calls and paydowns of held for investment securities	4,101	5,816	8,616
Proceeds from maturities, calls and paydowns of available for sale securities	225,394	181,769	145,740
Proceeds from sales of available for sale securities	4,855	521	6,025
Purchases of loans	(76,315)	(66,587)	(29,380)
Proceeds from sales of loans	30,201	88,166	49,385
Net other increase in loans	(319,950)	(174,915)	(252,905)
Purchases of premises, equipment and computer software	(11,490)	(13,896)	(13,438)
Proceeds from the sale of other assets	5,851	5,389	9,651
Net cash used in investing activities	(183,376)	(131,078)	(185,890)
FINANCING ACTIVITIES
Net increase in demand, transaction and savings deposits	305,940us-gaap_IncreaseDecreaseInDeposits	47,914us-gaap_IncreaseDecreaseInDeposits	467,688us-gaap_IncreaseDecreaseInDeposits
Net decrease in time deposits	(122,569)us-gaap_IncreaseDecreaseInTimeDeposits	(69,225)us-gaap_IncreaseDecreaseInTimeDeposits	(64,593)us-gaap_IncreaseDecreaseInTimeDeposits
Net (decrease)/increase in short-term borrowings	(608)	19	(3,703)
Pay down of long-term borrowings	(6,938)us-gaap_RepaymentsOfLongTermDebt	(2,240)us-gaap_RepaymentsOfLongTermDebt	(9,298)us-gaap_RepaymentsOfLongTermDebt
Issuance of common stock	6,532	5,200	3,540
Common stock acquired		(2,710)	(256)
Redemption of junior subordinated debentures			(9,279)
Cash dividends paid	(19,543)us-gaap_PaymentsOfDividendsCommonStock	(13,583)us-gaap_PaymentsOfDividendsCommonStock	(21,090)us-gaap_PaymentsOfDividendsCommonStock
Net cash provided by (used in) financing activities	162,814	(34,625)	363,009
Net increase /(decrease) in cash, due from banks and interest-bearing deposits	56,360	(87,613)	237,415
Cash, due from banks and interest-bearing deposits at the beginning of the period	1,857,535	1,945,148	1,707,733
Cash, due from banks and interest-bearing deposits at the end of the period	1,913,895	1,857,535	1,945,148
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Cash paid during the year for interest	13,135us-gaap_InterestPaidNet	14,142us-gaap_InterestPaidNet	18,312us-gaap_InterestPaidNet
Cash paid during the year for income taxes	26,178us-gaap_IncomeTaxesPaidNet	20,946us-gaap_IncomeTaxesPaidNet	25,975us-gaap_IncomeTaxesPaidNet
Noncash investing and financing activities:
Unpaid common stock dividends declared	$ 5,265	$ 4,744

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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 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 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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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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