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Loans and Allowance for Loan Losses - Summary of Individual and Collective Allowance for Loan Losses and Loan Balances by Class (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Valuation Allowance [Line Items]
Allowance, Individually Evaluated for Impairment	$ 1,268	$ 824
Allowance, Collectively Evaluated for Impairment	105,855	104,060
Loans	9,943,136	9,506,094
Loans Outstanding, Individually Evaluated for Impairment	35,766	34,376
Loans Outstanding, Collectively Evaluated for Impairment	8,308,632	8,120,389
Commercial Real Estate [Member]
Valuation Allowance [Line Items]
Allowance, Individually Evaluated for Impairment	1,087	701
Allowance, Collectively Evaluated for Impairment	37,446	31,847
Loans	3,464,598	3,245,209
Loans Outstanding, Individually Evaluated for Impairment	34,062	30,133
Loans Outstanding, Collectively Evaluated for Impairment	2,643,090	2,610,295
Commercial and Industrial [Member]
Valuation Allowance [Line Items]
Allowance, Individually Evaluated for Impairment	181	123
Allowance, Collectively Evaluated for Impairment	29,791	32,480
Loans	1,965,065	1,881,474
Loans Outstanding, Individually Evaluated for Impairment	1,704	4,243
Loans Outstanding, Collectively Evaluated for Impairment	1,846,628	1,757,425
Commercial Leases [Member]
Valuation Allowance [Line Items]
Allowance, Individually Evaluated for Impairment
Allowance, Collectively Evaluated for Impairment	1,945	1,903
Loans	161,494	158,895
Loans Outstanding, Collectively Evaluated for Impairment	161,494	158,895
Total Commercial Loans and Leases [Member]
Valuation Allowance [Line Items]
Allowance, Individually Evaluated for Impairment	1,268	824
Allowance, Collectively Evaluated for Impairment	69,182	66,230
Loans	5,591,157	5,285,578
Loans Outstanding, Individually Evaluated for Impairment	35,766	34,376
Loans Outstanding, Collectively Evaluated for Impairment	4,651,212	4,526,615
Direct Installment [Member]
Valuation Allowance [Line Items]
Allowance, Collectively Evaluated for Impairment	16,629	17,824
Loans	1,467,558	1,467,236
Loans Outstanding, Collectively Evaluated for Impairment	1,386,940	1,387,995
Residential Mortgages [Member]
Valuation Allowance [Line Items]
Allowance, Collectively Evaluated for Impairment	5,307	5,836
Loans	1,135,790	1,086,739
Loans Outstanding, Collectively Evaluated for Impairment	688,038	678,227
Indirect Installment [Member]
Valuation Allowance [Line Items]
Allowance, Collectively Evaluated for Impairment	6,500	6,409
Loans	678,918	655,587
Loans Outstanding, Collectively Evaluated for Impairment	674,347	649,701
Consumer Lines of Credit [Member]
Valuation Allowance [Line Items]
Allowance, Collectively Evaluated for Impairment	7,658	7,231
Loans	1,010,501	965,771
Loans Outstanding, Collectively Evaluated for Impairment	848,883	832,668
Other [Member]
Valuation Allowance [Line Items]
Allowance, Collectively Evaluated for Impairment	579	530
Loans	59,212	45,183
Loans Outstanding, Collectively Evaluated for Impairment	59,212	45,183
Originated Loans [Member]
Valuation Allowance [Line Items]
Loans	8,344,398	8,154,765
Originated Loans [Member] | Commercial Real Estate [Member]
Valuation Allowance [Line Items]
Loans	2,677,152	2,640,428
Originated Loans [Member] | Commercial and Industrial [Member]
Valuation Allowance [Line Items]
Loans	1,848,332	1,761,668
Originated Loans [Member] | Commercial Leases [Member]
Valuation Allowance [Line Items]
Loans	161,494	158,895
Originated Loans [Member] | Total Commercial Loans and Leases [Member]
Valuation Allowance [Line Items]
Loans	4,686,978	4,560,991
Originated Loans [Member] | Direct Installment [Member]
Valuation Allowance [Line Items]
Loans	1,386,940	1,387,995
Originated Loans [Member] | Residential Mortgages [Member]
Valuation Allowance [Line Items]
Loans	688,038	678,227
Originated Loans [Member] | Indirect Installment [Member]
Valuation Allowance [Line Items]
Loans	674,347	649,701
Originated Loans [Member] | Consumer Lines of Credit [Member]
Valuation Allowance [Line Items]
Loans	848,883	832,668
Originated Loans [Member] | Other [Member]
Valuation Allowance [Line Items]
Loans	$ 59,212	$ 45,183

X

- Definition

The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 11B

-Subparagraph (g)

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Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

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-Publisher FASB

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-Publisher FASB

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-Topic 310

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