Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Operating Activities
Net income	$ 17,992us-gaap_NetIncomeLoss	$ 13,803us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Accretion and amortization	(1,922)us-gaap_AccretionOfDiscount	(1,634)us-gaap_AccretionOfDiscount
Provision for loan losses	888us-gaap_ProvisionForLoanAndLeaseLosses	1,363us-gaap_ProvisionForLoanAndLeaseLosses
Depreciation of premises and equipment	1,511us-gaap_DepreciationNonproduction	1,478us-gaap_DepreciationNonproduction
Deferred income tax expense	964us-gaap_DeferredIncomeTaxExpenseBenefit	752us-gaap_DeferredIncomeTaxExpenseBenefit
Net periodic employee benefit cost	200	179
Realized investment securities gains	(14)us-gaap_RealizedInvestmentGainsLosses	(83)us-gaap_RealizedInvestmentGainsLosses
Stock-compensation expense	740us-gaap_ShareBasedCompensation	572us-gaap_ShareBasedCompensation
Increase in value of bank-owned life insurance	(764)	(756)
Loans originated for sale	(4,184)	(940)
Proceeds from the sale of loans originated for sale	3,637	1,672
Gain on sale of loans	(58)us-gaap_GainLossOnSalesOfLoansNet	(49)us-gaap_GainLossOnSalesOfLoansNet
Gain (Loss) on Disposition of Business	11,084us-gaap_GainLossOnSaleOfBusiness	0us-gaap_GainLossOnSaleOfBusiness
Gain (Loss) on Disposition of Business, after tax		0
Change in accrued interest receivable	(926)	(977)
Change in other assets	(1,824)	(3,629)
Change in other liabilities	8,343	(5,240)
Net Cash Provided by Operating Activities	13,499	6,511
Investing Activities
Proceeds from sales of securities available-for-sale	0	129
Proceeds from maturities and calls of securities available-for-sale	16,172	13,885
Proceeds from maturities and calls of securities held-to-maturity	3,336	0
Purchases of securities available-for-sale	(34,857)	(10,262)
Purchases of securities held-to-maturity	0	(10,226)
Net increase in loans	21,622	49,511
Purchases of premises and equipment	(472)	(356)
Proceeds from Divestiture of Businesses	15,250	0
Net Cash Provided by Investing Activities	21,051	42,681
Financing Activities
Net increase in noninterest-bearing deposits	6,131	17,178
Net increase in interest-bearing deposits	63,635	27,430
Net increase in short-term borrowings	(2,343)	(15,885)
Purchases of treasury stock	0	(2,936)
Proceeds from exercise of stock options, net of tax benefit	973	199
Dividends paid	(6,064)us-gaap_PaymentsOfDividends	(5,827)us-gaap_PaymentsOfDividends
Net Cash Provided by Financing Activities	62,332	20,159
Increase in Cash and Cash Equivalents	96,882	69,351
Cash and cash equivalents at beginning of period	148,228	85,876
Cash and Cash Equivalents at End of Period	$ 245,110	$ 155,227

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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 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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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (a),(b)

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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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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

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-Paragraph 12

-Subparagraph (a)

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The net cash inflow or outflow in Interest-bearing Deposits by banks in other financial institutions for relatively short periods of time including, for example, certificates of deposits.

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-Publisher FASB

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-Paragraph 9

-Subparagraph (c)

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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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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

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-Subparagraph (a),(b)

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-Paragraph 25

-Subparagraph (c)

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

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The net realized gains or losses on investments during the period, not including gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-04.3(a))

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-Paragraph 1

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 3

-Subparagraph a

-Article 7

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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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