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	$ 17,835us-gaap_NetIncomeLoss	$ 13,813us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	1,500us-gaap_ProvisionForLoanAndLeaseLosses	1,600us-gaap_ProvisionForLoanAndLeaseLosses
Gains on sales of loans	(1,589)us-gaap_GainLossOnSalesOfLoansNet	(647)us-gaap_GainLossOnSalesOfLoansNet
Proceeds from sales of loans	54,280	22,080
Loans originated for sale	(53,238)	(20,028)
Net gains from sales/writedowns of other real estate and repossessed assets	(570)	(379)
Depreciation of premises and equipment	2,479us-gaap_DepreciationNonproduction	2,119us-gaap_DepreciationNonproduction
Amortization of intangible assets	1,825us-gaap_AmortizationOfIntangibleAssets	695us-gaap_AmortizationOfIntangibleAssets
Gain on sale of investment securities	(579)us-gaap_GainLossOnSaleOfInvestments	0us-gaap_GainLossOnSaleOfInvestments
Net amortization of premiums and discounts on investment securities	1,373	1,093
Share-based compensation expense	755us-gaap_ShareBasedCompensation	554us-gaap_ShareBasedCompensation
Net increase in interest receivable and other assets	(9,562)	(1,319)
Net increase (decrease) in interest payable and other liabilities	(7,038)	1,239
Net cash provided by operating activities	7,471	20,820
Investment securities – available-for-sale:
Proceeds from sales	13,172	0
Proceeds from maturities, calls and principal reductions	57,449	28,426
Investment securities – held-to-maturity:
Proceeds from maturities, calls and principal reductions	7,542	31,798
Purchases	(72,748)	(36,309)
Net increase in loans	(20,233)	(109,965)
Proceeds from sales of other real estate and repossessed assets	3,693	2,197
Purchases of premises and equipment, net of disposals	(1,469)	(1,590)
Net cash used in investing activities	(12,594)	(85,443)
Financing Activities
Net increase in interest- and noninterest-bearing demand deposits and savings accounts	247,244	78,246
Net increase (decrease) in time deposits	(5,862)us-gaap_IncreaseDecreaseInTimeDeposits	30,662us-gaap_IncreaseDecreaseInTimeDeposits
Net increase (decrease) in short-term borrowings	(17,231)	33,803
Cash dividends paid	(7,899)us-gaap_PaymentsOfDividendsCommonStock	(6,881)us-gaap_PaymentsOfDividendsCommonStock
Proceeds from directors’ stock plans and exercise of stock options, net of shares withheld	447us-gaap_ProceedsFromStockPlans	867us-gaap_ProceedsFromStockPlans
Cash paid for payroll taxes upon conversion of share-based awards	(658)	(477)
Net cash provided by financing activities	216,041	136,220
Net increase in cash and cash equivalents	210,918	71,597
Cash and cash equivalents at beginning of period	183,020	310,788
Cash and cash equivalents at end of period	393,938	382,385
Supplemental Disclosure of Cash Flow Information:
Interest paid	3,426us-gaap_InterestPaid	3,858us-gaap_InterestPaid
Loans transferred to other real estate and repossessed assets	3,662us-gaap_TransferOfOtherRealEstate	2,098us-gaap_TransferOfOtherRealEstate
Income Taxes Paid	$ 9,800us-gaap_IncomeTaxesPaidNet	$ 0us-gaap_IncomeTaxesPaidNet

The sum of the periodic adjustments of the differences between securities' face values and purchase prices that are charged against earnings. This is called accretion if the security was purchased at a discount and amortization if it was purchased at premium. As a noncash item, this element is an adjustment to net income when calculating cash provided by or used in operations using the indirect method.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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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 from the sale assets received in full or partial satisfaction of a receivable including real and personal property; equity interests in corporations, partnerships, and joint ventures; and beneficial interests in trusts. Foreclosed assets also include loans that are treated as if the underlying collateral had been foreclosed because the institution has taken possession of the collateral, even though legal foreclosure or repossession proceedings have not taken place.

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The cash inflow associated with the amount received from the stock plan during the period.

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

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The value of restricted shares issued as compensation, net of the value of shares for the payment of withholding taxes. This element is to be used only if shares are used in lieu of cash to satisfy all or a portion of withholding taxes.

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Value transferred out of real estate owned (REO) in noncash transactions.

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