Consolidated Statements of Cash Flow (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 16,259us-gaap_NetIncomeLoss	$ 14,657us-gaap_NetIncomeLoss
Adjustments to reconcile to net cash provided by operating activities:
Provision for loan losses	1,334us-gaap_ProvisionForLoanAndLeaseLosses	1,218us-gaap_ProvisionForLoanAndLeaseLosses
Depreciation and amortization	2,908	2,757
Net amortization of securities premiums and discounts	148	276
Realized securities gains	(1,729)us-gaap_GainLossOnSaleOfSecuritiesNet	(450)us-gaap_GainLossOnSaleOfSecuritiesNet
Gain on sales of loans	(440)us-gaap_GainLossOnSalesOfLoansNet	(351)us-gaap_GainLossOnSalesOfLoansNet
Cash receipts from the sale of loans originated for sale	36,163	30,779
Cash disbursements for loans originated for sale	(37,393)	(29,189)
Deferred income tax provision	(586)us-gaap_DeferredIncomeTaxExpenseBenefit	(1,934)us-gaap_DeferredIncomeTaxExpenseBenefit
(Gain) loss on other assets	207us-gaap_GainLossOnSaleOfOtherAssets	(62)us-gaap_GainLossOnSaleOfOtherAssets
(Increase) decrease in interest receivable	(356)	133
Decrease in interest payable	(20)	(200)
Amortization of stock-based compensation arrangements	464us-gaap_ShareBasedCompensation	347us-gaap_ShareBasedCompensation
Other, net	5,855	2,205
Net cash provided by operating activities	22,814	20,186
INVESTING ACTIVITIES
Net decrease in federal funds sold	(1,000)	1,619
Net cash and due from banks received from acquisitions		174,645
Purchases of available for sale securities	(30,740)	(99,914)
Proceeds from maturities, calls and paydowns of held for investment securities	311	718
Proceeds from maturities, calls and paydowns of available for sale securities	6,144	44,920
Proceeds from sales of available for sale securities	1,729	498
Net change in loans	3,613	(46,429)
Purchases of premises, equipment and computer software	(4,107)	(3,154)
Proceeds from the sale of other assets	1,955	812
Net cash provided by investing activities	(22,095)	73,715
FINANCING ACTIVITIES
Net (decrease) increase in demand, transaction and savings deposits	(6,257)	80,601
Net decrease in time deposits	(14,646)us-gaap_IncreaseDecreaseInTimeDeposits	(64,084)us-gaap_IncreaseDecreaseInTimeDeposits
Net increase in short-term borrowings	(1,939)	4,013
Paydown of long-term borrowings		(4,938)us-gaap_RepaymentsOfLongTermDebt
Issuance of common stock, net	180	831
Cash dividends paid	(5,271)us-gaap_PaymentsOfDividendsCommonStock	(4,753)us-gaap_PaymentsOfDividendsCommonStock
Net cash (used in) provided by financing activities	(27,933)	11,670
Net (decrease) increase in cash, due from banks and interest-bearing deposits	(27,214)	105,571
Cash, due from banks and interest-bearing deposits at the beginning of the period	1,913,895	1,857,535
Cash, due from banks and interest-bearing deposits at the end of the period	1,886,681	1,963,106
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Cash paid during the period for interest	3,050us-gaap_InterestPaidNet	2,991us-gaap_InterestPaidNet
Cash paid during the period for income taxes	600us-gaap_IncomeTaxesPaidNet	850us-gaap_IncomeTaxesPaidNet
Noncash investing and financing activities:
Unpaid common stock dividends declared	$ 5,271	$ 4,744

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The aggregate cash outflow used to purchase all loans that are held with the intention to resell in the near future.

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The cash inflow from the additional capital contribution to the entity.

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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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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 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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