Fair Value Measurements (Estimated Fair Values Of The Corporation's Financial Instruments) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and short-term investments	$ 208,953	$ 131,571	$ 310,550	$ 172,203
Securities available for sale	640,571	738,125	715,349
Securities held to maturity	917,212	940,481
Bank owned life insurance	208,927	208,051
Deposits	7,289,768	6,646,143
Short-term borrowings	851,294	753,603
Long-term debt	88,016	192,058
Junior subordinated debt	203,967	204,036
Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and short-term investments	208,953	131,571
Securities available for sale	640,571	738,125
Securities held to maturity	917,212	940,481
Net loans, including loans held for sale	6,770,280	5,994,735
Bank owned life insurance	208,927	208,051
Accrued interest receivable	25,930	25,345
Deposits	7,289,768	6,646,143
Short-term borrowings	851,294	753,603
Long-term debt	88,016	192,058
Junior subordinated debt	203,967	204,036
Accrued interest payable	6,305	6,866
Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and short-term investments	208,953	131,571
Securities available for sale	640,571	738,125
Securities held to maturity	952,033	959,414
Net loans, including loans held for sale	6,829,830	6,035,129
Bank owned life insurance	208,927	208,051
Accrued interest receivable	25,930	25,345
Deposits	7,315,948	6,677,301
Short-term borrowings	851,294	754,211
Long-term debt	90,632	197,397
Junior subordinated debt	167,608	141,061
Accrued interest payable	$ 6,305	$ 6,866

For an unclassified balance sheet, this item represents investments in debt and equity securities which are categorized neither as held-to-maturity nor trading.

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