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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