Fair Value Measurements (Carrying Amounts and Estimated Fair Values) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Investment securities:
Available-for-sale	$ 748,864us-gaap_AvailableForSaleSecurities	$ 684,570us-gaap_AvailableForSaleSecurities
Held-to-maturity Securities, Fair Value	315,740	268,271
Carrying Amount [Member]
Investment securities:
Nonmarketable equity securities	27,369	25,572
Carrying Amount [Member] \| Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	183,020	310,788
Carrying Amount [Member] \| Level 2 [Member]
Investment securities:
Available-for-sale	748,864	684,570
Held-to-maturity Securities, Fair Value	305,913	263,405
Loans held-for-sale	9,128	5,219
Interest receivable	17,492	15,748
Liabilities:
Deposits without defined maturities	4,741,024	3,790,454
Interest Payable	755	868
Short-term borrowings	389,467	327,428
Carrying Amount [Member] \| Level 3 [Member]
Investment securities:
Held-to-maturity Securities, Fair Value	10,500	10,500
Net loans	5,612,547	4,568,549
Liabilities:
Time deposits	1,337,947	1,331,931
Fair Value [Member]
Investment securities:
Nonmarketable equity securities	27,369	25,572
Fair Value [Member] \| Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	183,020	310,788
Fair Value [Member] \| Level 2 [Member]
Investment securities:
Available-for-sale	748,864	684,570
Held-to-maturity Securities, Fair Value	308,650	262,021
Loans held-for-sale	9,128	5,219
Interest receivable	17,492	15,748
Liabilities:
Deposits without defined maturities	4,741,024	3,790,454
Interest Payable	755	868
Short-term borrowings	389,467	327,428
Fair Value [Member] \| Level 3 [Member]
Investment securities:
Held-to-maturity Securities, Fair Value	7,090	6,250
Net loans	5,623,454	4,575,532
Liabilities:
Time deposits	$ 1,340,015	$ 1,340,746

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Interest Receivable Fair Value Disclosure

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Fair value portion of accrued expenses.

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-Publisher SEC

-Name Regulation S-X (SX)

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Fair value portion 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.

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Fair value of investments in debt securities classified as held-to-maturity.

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Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables.

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Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

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Fair value portion of securities that an entity sells and agrees to repurchase at a specified date for a specified price.

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