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Fair Value Measurements (Estimated Fair Values Of Corporation's Financial Instruments) (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	$ 239,044	$ 208,953	$ 131,571	$ 310,550
Securities available for sale	1,172,683	640,571	738,125
Securities held to maturity	1,106,563	917,212
Bank owned life insurance	246,088	208,927
Derivative assets	58,008	52,857
Deposits	9,082,174	7,289,768
Short-term borrowings	1,083,138	851,294
Long-term debt	89,425	88,016
Junior subordinated debt	204,019	203,967
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	58,008	52,857
Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	239,044	208,953
Securities available for sale	1,172,683	640,571
Securities held to maturity	1,106,563	917,212
Net loans, including loans held for sale	8,061,097	6,770,280
Bank owned life insurance	246,088	208,927
Derivative assets	58,008	52,857
Accrued interest receivable	30,210	25,930
Deposits	9,082,175	7,289,768
Short-term borrowings	1,083,138	851,294
Long-term debt	89,425	88,016
Junior subordinated debt	204,019	203,967
Derivative liabilities	58,150	52,904
Accrued interest payable	9,054	6,305
Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	239,044	208,953
Securities available for sale	1,172,683	640,571
Securities held to maturity	1,143,213	952,033
Net loans, including loans held for sale	7,996,554	6,829,830
Bank owned life insurance	257,060	214,921
Derivative assets	58,008	52,857
Accrued interest receivable	30,210	25,930
Deposits	9,117,757	7,315,948
Short-term borrowings	1,083,138	851,294
Long-term debt	92,329	90,632
Junior subordinated debt	172,246	167,608
Derivative liabilities	58,150	52,904
Accrued interest payable	9,054	6,305
Fair Value [Member] \| Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	239,044
Securities available for sale	396
Bank owned life insurance	257,060
Accrued interest receivable	30,210
Deposits	6,546,316
Short-term borrowings	1,083,138
Accrued interest payable	9,054
Fair Value [Member] \| Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available for sale	1,139,722
Securities held to maturity	1,128,524
Derivative assets	58,008
Deposits	2,571,441
Derivative liabilities	58,150
Fair Value [Member] \| Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available for sale	32,565
Securities held to maturity	14,689
Net loans, including loans held for sale	7,966,554
Long-term debt	92,329
Junior subordinated debt	$ 172,246