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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	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial:	$ 5,876,899	$ 5,767,743	$ 5,510,887
Commercial Real Estate	4,221,847	4,002,097	4,020,478
Consumer Real Estate	871,670	849,051	847,068
Consumer and Other	412,972	393,601	391,480
Unearned discounts	(24,438)	(24,957)	(23,147)
Total loans	11,358,950	10,987,535	10,746,766
Loans Individually Evaluated for Impairment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial:	35,739	32,496	31,686
Commercial Real Estate	13,114	20,499	18,793
Consumer Real Estate	522	596	624
Consumer and Other	0	0	0
Unearned discounts	0	0	0
Total loans	49,375	53,591	51,103
Loans Collectively Evaluated for Impairment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial:	5,841,160	5,735,247	5,479,201
Commercial Real Estate	4,208,733	3,981,598	4,001,685
Consumer Real Estate	871,148	848,455	846,444
Consumer and Other	412,972	393,601	391,480
Unearned discounts	(24,438)	(24,957)	(23,147)
Total loans	$ 11,309,575	$ 10,933,944	$ 10,695,663

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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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