Fair Value Measurements (Carrying Amounts and Estimated Fair Values) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Investment securities:
Available-for-sale	$ 553,731	$ 748,864
Held-to-maturity Securities, Fair Value	512,705	315,740
Liabilities:
Short-term borrowings	397,199	389,467
Other Borrowings	242,391	0
Carrying Amount [Member]
Investment securities:
Nonmarketable equity securities	36,907	27,369
Carrying Amount [Member] \| Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	238,789	183,020
Investment securities:
Available-for-sale	5,765	8,259
Carrying Amount [Member] \| Level 2 [Member]
Investment securities:
Available-for-sale	547,966	740,605
Held-to-maturity Securities, Fair Value	509,471	305,913
Loans held-for-sale	10,327	9,128
Interest receivable	21,953	17,492
Liabilities:
Deposits without defined maturities	5,809,355	4,741,024
Interest Payable	1,578	755
Short-term borrowings	397,199	389,467
Other Borrowings	206,394	0
Carrying Amount [Member] \| Level 3 [Member]
Investment securities:
Held-to-maturity Securities, Fair Value	500	10,500
Net loans	7,197,819	5,612,547
Liabilities:
Time deposits	1,647,412	1,337,947
Other Borrowings	35,997	0
Fair Value [Member]
Investment securities:
Nonmarketable equity securities	36,907	27,369
Fair Value [Member] \| Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	238,789	183,020
Investment securities:
Available-for-sale	5,765	8,259
Fair Value [Member] \| Level 2 [Member]
Investment securities:
Available-for-sale	547,966	740,605
Held-to-maturity Securities, Fair Value	512,405	308,650
Loans held-for-sale	10,327	9,128
Interest receivable	21,953	17,492
Liabilities:
Deposits without defined maturities	5,809,355	4,741,024
Interest Payable	1,578	755
Short-term borrowings	397,199	389,467
Other Borrowings	206,394	0
Fair Value [Member] \| Level 3 [Member]
Investment securities:
Held-to-maturity Securities, Fair Value	300	7,090
Net loans	7,201,994	5,623,454
Liabilities:
Time deposits	1,647,412	1,340,015
Other Borrowings	$ 35,997	$ 0

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