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

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Fair Value Measurements (Estimated Fair Values Of Corporation's Financial Instruments) (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2011	Dec. 31, 2010
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	$ 367,594	$ 208,953	$ 232,735	$ 131,571
Securities available for sale	1,112,839	640,571
Securities held to maturity	1,151,743	917,212
Bank owned life insurance	239,615	208,927
Deposits	9,125,823	7,289,768
Short-term borrowings	1,019,411	851,294
Long-term debt	90,501	88,016
Junior subordinated debt	204,006	203,967
Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	367,594	208,953
Securities available for sale	1,112,839	640,571
Securities held to maturity	1,151,743	917,212
Net loans, including loans held for sale	7,898,311	6,770,280
Bank owned life insurance	239,615	208,927
Accrued interest receivable	31,889	25,930
Deposits	9,125,823	7,289,768
Short-term borrowings	1,019,411	851,294
Long-term debt	90,501	88,016
Junior subordinated debt	204,006	203,967
Accrued interest payable	9,473	6,305
Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	367,594	208,953
Securities available for sale	1,112,839	640,571
Securities held to maturity	1,196,359	952,033
Net loans, including loans held for sale	7,811,271	6,829,830
Bank owned life insurance	251,170	214,921
Accrued interest receivable	31,889	25,930
Deposits	9,168,838	7,315,948
Short-term borrowings	1,019,411	851,294
Long-term debt	93,507	90,632
Junior subordinated debt	172,353	167,608
Accrued interest payable	9,473	6,305
Fair Value [Member] \| Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	367,594
Securities available for sale	390
Bank owned life insurance	251,170
Accrued interest receivable	31,889
Deposits	6,500,005
Short-term borrowings	1,019,411
Accrued interest payable	9,473
Fair Value [Member] \| Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available for sale	1,081,711
Securities held to maturity	1,178,623
Deposits	2,668,833
Fair Value [Member] \| Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available for sale	30,738
Securities held to maturity	17,736
Net loans, including loans held for sale	7,811,271
Long-term debt	93,507
Junior subordinated debt	$ 172,353