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Allowance for Credit Losses and Credit Quality - Schedule of Allowance for Loan Losses for Legacy and Acquired Loans, by Loan Portfolio (Detail) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Financing Receivable, Allowance for Credit Losses    
Allowance for loan and lease losses at beginning of period $ 140,571 $ 140,891
Provision for (Reversal of) loan and lease losses 32,190 26,678
Transfer of balance to OREO and other (2,696) (5,709)
Charge-offs (29,971) (34,740)
Recoveries 6,141 9,830
Allowance for loan and lease losses at end of period 146,235 136,950
Financing Receivable, Reserve For Unfunded Commitments    
Reserve for unfunded commitments at beginning of period 14,830 13,208
Balance created in acquisition accounting   900
Provision for (Reversal of) unfunded commitments 1,314 613
Reserve for unfunded commitments at end of period 16,144 14,721
Allowance on loans individually evaluated for impairment 14,015 16,248
Allowance on loans collectively evaluated for impairment 120,822 107,970
Allowance on loans acquired with deteriorated credit quality 162,379 151,671
Loans and leases, net of unearned income:    
Balance at end of period 23,676,537 22,343,906
Balance at end of period individually evaluated for impairment 205,395 189,187
Balance at end of period collectively evaluated for impairment 23,185,245 21,749,855
Commercial Loans | Real Estate    
Financing Receivable, Allowance for Credit Losses    
Allowance for loan and lease losses at beginning of period 51,806 54,201
Provision for (Reversal of) loan and lease losses 9,205 (4,020)
Transfer of balance to OREO and other (309) (1,556)
Charge-offs (2,179) (1,281)
Recoveries 474 1,019
Allowance for loan and lease losses at end of period 58,997 48,363
Financing Receivable, Reserve For Unfunded Commitments    
Reserve for unfunded commitments at beginning of period 4,869 4,531
Balance created in acquisition accounting   129
Provision for (Reversal of) unfunded commitments 357 (134)
Reserve for unfunded commitments at end of period 5,226 4,526
Allowance on loans individually evaluated for impairment 2,721 2,650
Allowance on loans collectively evaluated for impairment 50,809 40,519
Loans and leases, net of unearned income:    
Balance at end of period 9,809,756 9,381,883
Balance at end of period individually evaluated for impairment 73,715 73,469
Balance at end of period collectively evaluated for impairment 9,605,296 9,126,653
Commercial Loans | Commercial and industrial    
Financing Receivable, Allowance for Credit Losses    
Allowance for loan and lease losses at beginning of period 54,096 53,916
Provision for (Reversal of) loan and lease losses 15,819 20,372
Transfer of balance to OREO and other 236 (814)
Charge-offs (17,799) (22,447)
Recoveries 3,163 5,665
Allowance for loan and lease losses at end of period 55,515 56,692
Financing Receivable, Reserve For Unfunded Commitments    
Reserve for unfunded commitments at beginning of period 6,198 5,309
Balance created in acquisition accounting   81
Provision for (Reversal of) unfunded commitments 493 169
Reserve for unfunded commitments at end of period 6,691 5,559
Allowance on loans individually evaluated for impairment 7,974 10,471
Allowance on loans collectively evaluated for impairment 45,990 44,727
Loans and leases, net of unearned income:    
Balance at end of period 6,490,125 5,581,040
Balance at end of period individually evaluated for impairment 51,350 75,625
Balance at end of period collectively evaluated for impairment 6,417,426 5,478,377
Residential mortgage loans    
Financing Receivable, Allowance for Credit Losses    
Allowance for loan and lease losses at beginning of period 12,998 9,117
Provision for (Reversal of) loan and lease losses (152) 2,318
Transfer of balance to OREO and other (2,879) (45)
Charge-offs (219) (365)
Recoveries 169 53
Allowance for loan and lease losses at end of period 9,917 11,078
Financing Receivable, Reserve For Unfunded Commitments    
Reserve for unfunded commitments at beginning of period 866 555
Balance created in acquisition accounting   0
Provision for (Reversal of) unfunded commitments (216) 246
Reserve for unfunded commitments at end of period 650 801
Allowance on loans individually evaluated for impairment 281 154
Allowance on loans collectively evaluated for impairment 5,393 5,063
Loans and leases, net of unearned income:    
Balance at end of period 4,649,745 4,300,163
Balance at end of period individually evaluated for impairment 42,423 6,230
Balance at end of period collectively evaluated for impairment 4,526,508 4,174,524
Consumer and Other Loans    
Financing Receivable, Allowance for Credit Losses    
Allowance for loan and lease losses at beginning of period 21,671 23,657
Provision for (Reversal of) loan and lease losses 7,318 8,008
Transfer of balance to OREO and other 256 (3,294)
Charge-offs (9,774) (10,647)
Recoveries 2,335 3,093
Allowance for loan and lease losses at end of period 21,806 20,817
Financing Receivable, Reserve For Unfunded Commitments    
Reserve for unfunded commitments at beginning of period 2,897 2,813
Balance created in acquisition accounting   690
Provision for (Reversal of) unfunded commitments 680 332
Reserve for unfunded commitments at end of period 3,577 3,835
Allowance on loans individually evaluated for impairment 3,039 2,973
Allowance on loans collectively evaluated for impairment 18,630 17,661
Loans and leases, net of unearned income:    
Balance at end of period 2,726,911 3,080,820
Balance at end of period individually evaluated for impairment 37,907 33,863
Balance at end of period collectively evaluated for impairment 2,636,015 2,970,301
Receivables Acquired with Deteriorated Credit Quality    
Financing Receivable, Reserve For Unfunded Commitments    
Allowance on loans acquired with deteriorated credit quality 11,398 12,732
Loans and leases, net of unearned income:    
Balance at end of period acquired with deteriorated credit quality 285,897 404,864
Receivables Acquired with Deteriorated Credit Quality | Commercial Loans | Real Estate    
Financing Receivable, Reserve For Unfunded Commitments    
Allowance on loans acquired with deteriorated credit quality 5,467 5,194
Loans and leases, net of unearned income:    
Balance at end of period acquired with deteriorated credit quality 130,745 181,761
Receivables Acquired with Deteriorated Credit Quality | Commercial Loans | Commercial and industrial    
Financing Receivable, Reserve For Unfunded Commitments    
Allowance on loans acquired with deteriorated credit quality 1,551 1,494
Loans and leases, net of unearned income:    
Balance at end of period acquired with deteriorated credit quality 21,349 27,038
Receivables Acquired with Deteriorated Credit Quality | Residential mortgage loans    
Financing Receivable, Reserve For Unfunded Commitments    
Allowance on loans acquired with deteriorated credit quality 4,243 5,861
Loans and leases, net of unearned income:    
Balance at end of period acquired with deteriorated credit quality 80,814 119,409
Receivables Acquired with Deteriorated Credit Quality | Consumer and Other Loans    
Financing Receivable, Reserve For Unfunded Commitments    
Allowance on loans acquired with deteriorated credit quality 137 183
Loans and leases, net of unearned income:    
Balance at end of period acquired with deteriorated credit quality $ 52,989 $ 76,656