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Loans - Investment in Loans Related to Allowance for Loan Losses by Portfolio Segment Disaggregated Based on Impairment Methodology (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial:	$ 5,106,726	$ 4,907,076	$ 4,708,665
Commercial Real Estate	3,496,139	3,467,336	3,391,509
Consumer Real Estate	818,997	808,204	771,656
Consumer and Other	352,320	358,116	311,348
Unearned discounts	(23,537)	(25,032)	(20,827)
Total loans	9,750,645	9,515,700	9,162,351
Loans Individually Evaluated for Impairment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial:	206,984	210,273	148,858
Commercial Real Estate	123,355	136,601	158,651
Consumer Real Estate	718	745	834
Consumer and Other	264	278	384
Unearned discounts	0	0	0
Total loans	331,321	347,897	308,727
Loans Collectively Evaluated for Impairment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial:	4,899,742	4,696,803	4,559,807
Commercial Real Estate	3,372,784	3,330,735	3,232,858
Consumer Real Estate	818,279	807,459	770,822
Consumer and Other	352,056	357,838	310,964
Unearned discounts	(23,537)	(25,032)	(20,827)
Total loans	$ 9,419,324	$ 9,167,803	$ 8,853,624

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Amount before allowance of other consumer installment loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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Amount before allowance of consumer real estate loans. Includes, but not limited to, construction financing, residential mortgage loans, and home equity lines of credit. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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Amount of deferred interest and fee income, unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of acquired loans. Excludes amounts for loans and leases covered under loss sharing agreements.

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Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

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Amount before allowance of loans issued to commercial and industrial institutions. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes real estate loans and loans covered under loss sharing agreements.

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Amount before allowance of commercial loans issued to businesses to acquire, develop, construct, improve, or refinance land or building. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans covered under loss sharing agreements.

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