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Loans and Allowance for Loan Losses - Summary of Loans, Net of Unearned Income (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net of unearned income $ 9,943,136 $ 9,506,094
Commercial Real Estate [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net of unearned income 3,464,598 3,245,209
Commercial and Industrial [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net of unearned income 1,965,065 1,881,474
Commercial Leases [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net of unearned income 161,494 158,895
Total Commercial Loans and Leases [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net of unearned income 5,591,157 5,285,578
Direct Installment [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net of unearned income 1,467,558 1,467,236
Residential Mortgages [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net of unearned income 1,135,790 1,086,739
Indirect Installment [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net of unearned income 678,918 655,587
Consumer Lines of Credit [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net of unearned income 1,010,501 965,771
Other [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net of unearned income 59,212 45,183
Originated Loans [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net of unearned income 8,344,398 8,154,765
Originated Loans [Member] | Commercial Real Estate [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net of unearned income 2,677,152 2,640,428
Originated Loans [Member] | Commercial and Industrial [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net of unearned income 1,848,332 1,761,668
Originated Loans [Member] | Commercial Leases [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net of unearned income 161,494 158,895
Originated Loans [Member] | Total Commercial Loans and Leases [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net of unearned income 4,686,978 4,560,991
Originated Loans [Member] | Direct Installment [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net of unearned income 1,386,940 1,387,995
Originated Loans [Member] | Residential Mortgages [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net of unearned income 688,038 678,227
Originated Loans [Member] | Indirect Installment [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net of unearned income 674,347 649,701
Originated Loans [Member] | Consumer Lines of Credit [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net of unearned income 848,883 832,668
Originated Loans [Member] | Other [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net of unearned income 59,212 45,183
Acquired Loans [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net of unearned income 1,598,738 1,351,329
Acquired Loans [Member] | Commercial Real Estate [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net of unearned income 787,446 604,781
Acquired Loans [Member] | Commercial and Industrial [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net of unearned income 116,733 119,806
Acquired Loans [Member] | Commercial Leases [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net of unearned income      
Acquired Loans [Member] | Total Commercial Loans and Leases [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net of unearned income 904,179 724,587
Acquired Loans [Member] | Direct Installment [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net of unearned income 80,618 79,241
Acquired Loans [Member] | Residential Mortgages [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net of unearned income 447,752 408,512
Acquired Loans [Member] | Indirect Installment [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net of unearned income 4,571 5,886
Acquired Loans [Member] | Consumer Lines of Credit [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net of unearned income 161,618 133,103
Acquired Loans [Member] | Other [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net of unearned income