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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, 2018
Sep. 30, 2017
Financing Receivable, Allowance for Credit Losses    
provision for unfunded commitment, acquired $ 900 $ 7,626
Financing Receivable, Allowance for Credit Losses    
Allowance for loan losses at beginning of period 140,891 144,719
Provision for (Reversal of) loan losses 26,678 36,718
Transfer of balance to OREO and other (5,709) 963
Loans charged-off (34,740) (49,939)
Recoveries 9,830 4,167
Allowance for loan losses at end of period 136,950 136,628
Financing Receivable, Reserve For Unfunded Commitments    
Reserve for unfunded commitments at beginning of period 13,208 11,241
Provision for (Reversal of) unfunded commitments 613 2,165
Reserve for unfunded commitments at end of period 14,721 21,032
Allowance on loans individually evaluated for impairment 16,248 14,310
Allowance on loans collectively evaluated for impairment 107,970 88,549
Allowance on loans acquired with deteriorated credit quality 151,671 157,660
Loans, net of unearned income:    
Loans, net of unearned income 22,343,906 19,795,085
Balance at end of period individually evaluated for impairment 189,187 187,819
Balance at end of period collectively evaluated for impairment 21,749,855 19,125,381
Commercial Loans | Real Estate    
Financing Receivable, Allowance for Credit Losses    
provision for unfunded commitment, acquired 129 1,358
Financing Receivable, Allowance for Credit Losses    
Allowance for loan losses at beginning of period 54,201 49,231
Provision for (Reversal of) loan losses (4,020) 4,888
Transfer of balance to OREO and other (1,556) 879
Loans charged-off (1,281) (1,410)
Recoveries 1,019 668
Allowance for loan losses at end of period 48,363 54,256
Financing Receivable, Reserve For Unfunded Commitments    
Reserve for unfunded commitments at beginning of period 4,531 3,207
Provision for (Reversal of) unfunded commitments (134) 1,239
Reserve for unfunded commitments at end of period 4,526 5,804
Allowance on loans individually evaluated for impairment 2,650 1,957
Allowance on loans collectively evaluated for impairment 40,519 30,016
Loans, net of unearned income:    
Loans, net of unearned income 9,381,883 8,767,886
Balance at end of period individually evaluated for impairment 73,469 68,241
Balance at end of period collectively evaluated for impairment 9,126,653 8,457,950
Commercial Loans | Commercial and industrial    
Financing Receivable, Allowance for Credit Losses    
provision for unfunded commitment, acquired 81 4,903
Financing Receivable, Allowance for Credit Losses    
Allowance for loan losses at beginning of period 53,916 60,939
Provision for (Reversal of) loan losses 20,372 23,574
Transfer of balance to OREO and other (814) (69)
Loans charged-off (22,447) (37,110)
Recoveries 5,665 605
Allowance for loan losses at end of period 56,692 47,939
Financing Receivable, Reserve For Unfunded Commitments    
Reserve for unfunded commitments at beginning of period 5,309 4,537
Provision for (Reversal of) unfunded commitments 169 752
Reserve for unfunded commitments at end of period 5,559 10,192
Allowance on loans individually evaluated for impairment 10,471 9,744
Allowance on loans collectively evaluated for impairment 44,727 35,964
Loans, net of unearned income:    
Loans, net of unearned income 5,581,040 5,016,437
Balance at end of period individually evaluated for impairment 75,625 85,054
Balance at end of period collectively evaluated for impairment 5,478,377 4,899,842
Residential Mortgage    
Financing Receivable, Allowance for Credit Losses    
provision for unfunded commitment, acquired 0 1,303
Financing Receivable, Allowance for Credit Losses    
Allowance for loan losses at beginning of period 9,117 11,249
Provision for (Reversal of) loan losses 2,318 (1,333)
Transfer of balance to OREO and other (45) 2
Loans charged-off (365) (265)
Recoveries 53 148
Allowance for loan losses at end of period 11,078 9,801
Financing Receivable, Reserve For Unfunded Commitments    
Reserve for unfunded commitments at beginning of period 555 657
Provision for (Reversal of) unfunded commitments 246 (30)
Reserve for unfunded commitments at end of period 801 1,930
Allowance on loans individually evaluated for impairment 154 164
Allowance on loans collectively evaluated for impairment 5,063 3,801
Loans, net of unearned income:    
Loans, net of unearned income 4,300,163 3,024,970
Balance at end of period individually evaluated for impairment 6,230 5,384
Balance at end of period collectively evaluated for impairment 4,174,524 2,890,206
Consumer and Other Loans    
Financing Receivable, Allowance for Credit Losses    
provision for unfunded commitment, acquired 690 62
Financing Receivable, Allowance for Credit Losses    
Allowance for loan losses at beginning of period 23,657 23,300
Provision for (Reversal of) loan losses 8,008 9,589
Transfer of balance to OREO and other (3,294) 151
Loans charged-off (10,647) (11,154)
Recoveries 3,093 2,746
Allowance for loan losses at end of period 20,817 24,632
Financing Receivable, Reserve For Unfunded Commitments    
Reserve for unfunded commitments at beginning of period 2,813 2,840
Provision for (Reversal of) unfunded commitments 332 204
Reserve for unfunded commitments at end of period 3,835 3,106
Allowance on loans individually evaluated for impairment 2,973 2,445
Allowance on loans collectively evaluated for impairment 17,661 18,768
Loans, net of unearned income:    
Loans, net of unearned income 3,080,820 2,985,792
Balance at end of period individually evaluated for impairment 33,863 29,140
Balance at end of period collectively evaluated for impairment 2,970,301 2,877,383
Receivables Acquired with Deteriorated Credit Quality    
Financing Receivable, Reserve For Unfunded Commitments    
Allowance on loans acquired with deteriorated credit quality 12,732 33,769
Loans, net of unearned income:    
Balance at end of period acquired with deteriorated credit quality 404,864 481,885
Receivables Acquired with Deteriorated Credit Quality | Commercial Loans | Real Estate    
Financing Receivable, Reserve For Unfunded Commitments    
Allowance on loans acquired with deteriorated credit quality 5,194 22,283
Loans, net of unearned income:    
Balance at end of period acquired with deteriorated credit quality 181,761 241,695
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 1,494 2,231
Loans, net of unearned income:    
Balance at end of period acquired with deteriorated credit quality 27,038 31,541
Receivables Acquired with Deteriorated Credit Quality | Residential Mortgage    
Financing Receivable, Reserve For Unfunded Commitments    
Allowance on loans acquired with deteriorated credit quality 5,861 5,836
Loans, net of unearned income:    
Balance at end of period acquired with deteriorated credit quality 119,409 129,380
Receivables Acquired with Deteriorated Credit Quality | Consumer and Other Loans    
Financing Receivable, Reserve For Unfunded Commitments    
Allowance on loans acquired with deteriorated credit quality 183 3,419
Loans, net of unearned income:    
Balance at end of period acquired with deteriorated credit quality $ 76,656 $ 79,269