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Loans and Allowance for Loan Losses - Age Analysis of Past Due Loans, by Class (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans $ 9,943,136 $ 9,506,094
Commercial Real Estate [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans 3,464,598 3,245,209
Commercial and Industrial [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans 1,965,065 1,881,474
Commercial Leases [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans 161,494 158,895
Total Commercial Loans and Leases [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans 5,591,157 5,285,578
Direct Installment [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans 1,467,558 1,467,236
Residential Mortgages [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans 1,135,790 1,086,739
Indirect Installment [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans 678,918 655,587
Consumer Lines of Credit [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans 1,010,501 965,771
Other [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total Loans 59,212 45,183
Originated Loans [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-89 Days Past Due 32,490 37,342
> 90 Days Past Due and Still Accruing 5,467 7,971
Non- Accrual 60,039 58,755
Total Past Due 97,996 104,068
Current 8,246,402 8,050,697
Total Loans 8,344,398 8,154,765
Originated Loans [Member] | Commercial Real Estate [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-89 Days Past Due 6,297 5,428
> 90 Days Past Due and Still Accruing 243 252
Non- Accrual 43,385 40,960
Total Past Due 49,925 46,640
Current 2,627,227 2,593,788
Total Loans 2,677,152 2,640,428
Originated Loans [Member] | Commercial and Industrial [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-89 Days Past Due 2,564 2,066
> 90 Days Past Due and Still Accruing 8 8
Non- Accrual 4,194 6,643
Total Past Due 6,766 8,717
Current 1,841,566 1,752,951
Total Loans 1,848,332 1,761,668
Originated Loans [Member] | Commercial Leases [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-89 Days Past Due 1,150 714
> 90 Days Past Due and Still Accruing      
Non- Accrual 744 734
Total Past Due 1,894 1,448
Current 159,600 157,447
Total Loans 161,494 158,895
Originated Loans [Member] | Total Commercial Loans and Leases [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-89 Days Past Due 10,011 8,208
> 90 Days Past Due and Still Accruing 251 260
Non- Accrual 48,323 48,337
Total Past Due 58,585 56,805
Current 4,628,393 4,504,186
Total Loans 4,686,978 4,560,991
Originated Loans [Member] | Direct Installment [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-89 Days Past Due 7,893 9,038
> 90 Days Past Due and Still Accruing 2,876 3,753
Non- Accrual 6,405 4,686
Total Past Due 17,174 17,477
Current 1,369,766 1,370,518
Total Loans 1,386,940 1,387,995
Originated Loans [Member] | Residential Mortgages [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-89 Days Past Due 8,591 12,681
> 90 Days Past Due and Still Accruing 1,406 2,401
Non- Accrual 3,521 4,260
Total Past Due 13,518 19,342
Current 674,520 658,885
Total Loans 688,038 678,227
Originated Loans [Member] | Indirect Installment [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-89 Days Past Due 3,762 5,653
> 90 Days Past Due and Still Accruing 240 471
Non- Accrual 1,259 1,060
Total Past Due 5,261 7,184
Current 669,086 642,517
Total Loans 674,347 649,701
Originated Loans [Member] | Consumer Lines of Credit [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-89 Days Past Due 2,207 1,737
> 90 Days Past Due and Still Accruing 685 1,076
Non- Accrual 531 412
Total Past Due 3,423 3,225
Current 845,460 829,443
Total Loans 848,883 832,668
Originated Loans [Member] | Other [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-89 Days Past Due 26 25
> 90 Days Past Due and Still Accruing 9 10
Non- Accrual      
Total Past Due 35 35
Current 59,177 45,148
Total Loans 59,212 45,183
Acquired Loans [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-89 Days Past Due 34,668 30,205
> 90 Days Past Due and Still Accruing 61,629 45,823
Non- Accrual      
Total Past Due 96,297 76,028
Current 1,608,592 1,373,199
Total Loans 1,598,738 1,351,329
Discount (106,151) (97,898)
Acquired Loans [Member] | Commercial Real Estate [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-89 Days Past Due 23,180 13,637
> 90 Days Past Due and Still Accruing 31,063 20,668
Non- Accrual      
Total Past Due 54,243 34,305
Current 790,425 619,197
Total Loans 787,446 604,781
Discount (57,222) (48,721)
Acquired Loans [Member] | Commercial and Industrial [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-89 Days Past Due 726 1,860
> 90 Days Past Due and Still Accruing 5,296 1,899
Non- Accrual      
Total Past Due 6,022 3,759
Current 119,541 124,415
Total Loans 116,733 119,806
Discount (8,830) (8,368)
Acquired Loans [Member] | Commercial Leases [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-89 Days Past Due      
> 90 Days Past Due and Still Accruing      
Non- Accrual      
Total Past Due      
Current      
Total Loans      
Discount      
Acquired Loans [Member] | Total Commercial Loans and Leases [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-89 Days Past Due 23,906 15,497
> 90 Days Past Due and Still Accruing 36,359 22,567
Non- Accrual      
Total Past Due 60,265 38,064
Current 909,966 743,612
Total Loans 904,179 724,587
Discount (66,052) (57,089)
Acquired Loans [Member] | Direct Installment [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-89 Days Past Due 1,112 1,447
> 90 Days Past Due and Still Accruing 957 1,178
Non- Accrual      
Total Past Due 2,069 2,625
Current 76,628 74,917
Total Loans 80,618 79,241
Discount 1,921 1,699
Acquired Loans [Member] | Residential Mortgages [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-89 Days Past Due 8,514 11,464
> 90 Days Past Due and Still Accruing 20,886 19,298
Non- Accrual      
Total Past Due 29,400 30,762
Current 452,306 412,704
Total Loans 447,752 408,512
Discount (33,954) (34,954)
Acquired Loans [Member] | Indirect Installment [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-89 Days Past Due 101 205
> 90 Days Past Due and Still Accruing 31 31
Non- Accrual      
Total Past Due 132 236
Current 5,032 6,267
Total Loans 4,571 5,886
Discount (593) (617)
Acquired Loans [Member] | Consumer Lines of Credit [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-89 Days Past Due 1,035 1,592
> 90 Days Past Due and Still Accruing 3,396 2,749
Non- Accrual      
Total Past Due 4,431 4,341
Current 164,660 135,699
Total Loans 161,618 133,103
Discount (7,473) (6,937)
Acquired Loans [Member] | Other [Member]
    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
30-89 Days Past Due      
> 90 Days Past Due and Still Accruing      
Non- Accrual      
Total Past Due      
Current      
Total Loans      
Discount