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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The carrying amount of a life insurance policy on an officer, executive or employee for which the reporting entity (a bank) is entitled to proceeds from the policy upon death of the insured or surrender of the insurance policy.

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For an unclassified balance sheet, this item represents investments in debt securities which are categorized as held-to-maturity. The held-to-maturity category is for those securities that the entity has the positive intent and ability to hold until maturity.

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Carrying value as of the balance sheet date of [accrued] interest payable on all forms of debt, including trade payables, that has been incurred and is unpaid.

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Carrying amount as of the balance sheet date of interest earned but not received. Also called accrued interest or accrued interest receivable.

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Total of loans held-for-sale and held-in-portfolio net of unearned income, allowance for loan and lease losses, if any, unamortized loan origination and other fees and costs, and purchased premiums or discounts.

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Fair Value Measurements (Estimated Fair Values Of The Corporation's Financial Instruments) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2011	Dec. 31, 2010
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	$ 264,722	$ 208,953	$ 289,908	$ 131,571
Securities available for sale	1,097,801	640,571
Securities held to maturity	1,178,558	917,212
Bank owned life insurance	236,753	208,927
Deposits	9,055,154	7,289,768
Short-term borrowings	877,828	851,294
Long-term debt	90,308	88,016
Junior subordinated debt	203,980	203,967
Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	264,722	208,953
Securities available for sale	1,097,801	640,571
Securities held to maturity	1,178,558	917,212
Net loans, including loans held for sale	7,712,317	6,770,280
Bank owned life insurance	236,753	208,927
Accrued interest receivable	30,307	25,930
Deposits	9,055,154	7,289,768
Short-term borrowings	877,828	851,294
Long-term debt	90,308	88,016
Junior subordinated debt	203,980	203,967
Accrued interest payable	10,522	6,305
Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	264,722	208,953
Securities available for sale	1,097,801	640,571
Securities held to maturity	1,212,826	952,033
Net loans, including loans held for sale	7,608,501	6,829,830
Bank owned life insurance	236,753	208,927
Accrued interest receivable	30,307	25,930
Deposits	9,100,600	7,315,948
Short-term borrowings	877,828	851,294
Long-term debt	92,889	90,632
Junior subordinated debt	172,540	167,608
Accrued interest payable	10,522	6,305
Level 1 [Member] \| Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	264,722
Securities available for sale	937
Bank owned life insurance	236,753
Accrued interest receivable	30,307
Deposits	6,286,088
Short-term borrowings	877,828
Accrued interest payable	10,522
Level 2 [Member] \| Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available for sale	1,063,315
Securities held to maturity	1,191,692
Deposits	2,814,512
Level 3 [Member] \| Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available for sale	33,549
Securities held to maturity	21,134
Net loans, including loans held for sale	7,608,501
Long-term debt	92,889
Junior subordinated debt	$ 172,540