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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
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses      
provision for unfunded commitment, acquired $ 709 $ 1,370  
Financing Receivable, Allowance for Credit Losses      
Allowance for loan losses at beginning of period 140,891 144,719 $ 138,378
Provision for (Reversal of) loan losses 39,472 51,111 44,424
Decrease in FDIC loss share receivable     1,497
Transfer of balance to OREO and other (7,172) 934 (2,781)
Loans charged-off (45,547) (62,466) (39,839)
Recoveries 12,927 6,593 6,034
Allowance for loan losses at end of period 140,571 140,891 144,719
Financing Receivable, Reserve For Unfunded Commitments      
Reserve for unfunded commitments at beginning of period 13,208 11,241 14,145
Provision for (Reversal of) unfunded commitments 913 597 2,904
Reserve for unfunded commitments at end of period 14,830 13,208 11,241
Allowance on loans individually evaluated for impairment 16,342 17,352 24,293
Allowance on loans collectively evaluated for impairment 111,266 89,655 84,214
Allowance on loans acquired with deteriorated credit quality 155,401 154,099 155,960
Loans, net of unearned income:      
Loans, net of unearned income 22,519,815 20,078,181 15,064,971
Balance at end of period individually evaluated for impairment 169,725 238,127 302,780
Balance at end of period collectively evaluated for impairment 21,986,677 19,358,499 14,232,005
Commercial Loans | Real Estate      
Financing Receivable, Allowance for Credit Losses      
provision for unfunded commitment, acquired 118 253  
Financing Receivable, Allowance for Credit Losses      
Allowance for loan losses at beginning of period 54,201 49,231 51,372
Provision for (Reversal of) loan losses (829) 10,433 1,958
Decrease in FDIC loss share receivable     34
Transfer of balance to OREO and other (2,256) 853 (868)
Loans charged-off (1,611) (7,433) (4,338)
Recoveries 2,301 1,117 1,141
Allowance for loan losses at end of period 51,806 54,201 49,231
Financing Receivable, Reserve For Unfunded Commitments      
Reserve for unfunded commitments at beginning of period 4,531 3,207 4,167
Provision for (Reversal of) unfunded commitments 220 1,071 960
Reserve for unfunded commitments at end of period 4,869 4,531 3,207
Allowance on loans individually evaluated for impairment 636 1,588 1,378
Allowance on loans collectively evaluated for impairment 45,651 30,360 25,248
Loans, net of unearned income:      
Loans, net of unearned income 9,388,305 8,938,230 6,846,549
Balance at end of period individually evaluated for impairment 53,905 91,785 61,006
Balance at end of period collectively evaluated for impairment 9,166,070 8,616,924 6,504,875
Commercial Loans | Commercial and industrial      
Financing Receivable, Allowance for Credit Losses      
provision for unfunded commitment, acquired 40 783  
Financing Receivable, Allowance for Credit Losses      
Allowance for loan losses at beginning of period 53,916 60,939 49,355
Provision for (Reversal of) loan losses 23,866 31,891 32,296
Decrease in FDIC loss share receivable     50
Transfer of balance to OREO and other (812) (68) (519)
Loans charged-off (29,578) (40,015) (21,645)
Recoveries 6,704 1,169 1,502
Allowance for loan losses at end of period 54,096 53,916 60,939
Financing Receivable, Reserve For Unfunded Commitments      
Reserve for unfunded commitments at beginning of period 5,309 4,537 6,106
Provision for (Reversal of) unfunded commitments 849 (11) 1,569
Reserve for unfunded commitments at end of period 6,198 5,309 4,537
Allowance on loans individually evaluated for impairment 12,646 12,736 21,413
Allowance on loans collectively evaluated for impairment 39,949 38,944 37,206
Loans, net of unearned income:      
Loans, net of unearned income 5,737,017 5,135,067 4,060,032
Balance at end of period individually evaluated for impairment 71,801 102,416 220,995
Balance at end of period collectively evaluated for impairment 5,638,375 5,001,505 3,806,305
Residential Mortgage      
Financing Receivable, Allowance for Credit Losses      
provision for unfunded commitment, acquired 551 327  
Financing Receivable, Allowance for Credit Losses      
Allowance for loan losses at beginning of period 9,117 11,249 11,789
Provision for (Reversal of) loan losses 4,200 (2,206) 824
Decrease in FDIC loss share receivable     1,090
Transfer of balance to OREO and other (106) 2 (141)
Loans charged-off (334) (365) (313)
Recoveries 121 437 180
Allowance for loan losses at end of period 12,998 9,117 11,249
Financing Receivable, Reserve For Unfunded Commitments      
Reserve for unfunded commitments at beginning of period 555 657 830
Provision for (Reversal of) unfunded commitments (240) (429) 173
Reserve for unfunded commitments at end of period 866 555 657
Allowance on loans individually evaluated for impairment 145 172 144
Allowance on loans collectively evaluated for impairment 6,961 3,141 4,223
Loans, net of unearned income:      
Loans, net of unearned income 4,359,156 3,056,352 1,267,400
Balance at end of period individually evaluated for impairment 6,579 6,749 4,312
Balance at end of period collectively evaluated for impairment 4,259,369 2,911,222 1,140,136
Consumer and Other Loans      
Financing Receivable, Allowance for Credit Losses      
provision for unfunded commitment, acquired 0 7  
Financing Receivable, Allowance for Credit Losses      
Allowance for loan losses at beginning of period 23,657 23,300 25,862
Provision for (Reversal of) loan losses 12,235 10,993 9,346
Decrease in FDIC loss share receivable     323
Transfer of balance to OREO and other (3,998) 147 (1,253)
Loans charged-off (14,024) (14,653) (13,543)
Recoveries 3,801 3,870 3,211
Allowance for loan losses at end of period 21,671 23,657 23,300
Financing Receivable, Reserve For Unfunded Commitments      
Reserve for unfunded commitments at beginning of period 2,813 2,840 3,042
Provision for (Reversal of) unfunded commitments 84 (34) 202
Reserve for unfunded commitments at end of period 2,897 2,813 2,840
Allowance on loans individually evaluated for impairment 2,915 2,856 1,358
Allowance on loans collectively evaluated for impairment 18,705 17,210 17,537
Loans, net of unearned income:      
Loans, net of unearned income 3,035,337 2,948,532 2,890,990
Balance at end of period individually evaluated for impairment 37,440 37,177 16,467
Balance at end of period collectively evaluated for impairment 2,922,863 2,828,848 2,780,689
Receivables Acquired with Deteriorated Credit Quality      
Financing Receivable, Reserve For Unfunded Commitments      
Allowance on loans acquired with deteriorated credit quality 12,963 33,884 36,212
Loans, net of unearned income:      
Balance at end of period acquired with deteriorated credit quality 363,413 481,555 530,186
Receivables Acquired with Deteriorated Credit Quality | Commercial Loans | Real Estate      
Financing Receivable, Reserve For Unfunded Commitments      
Allowance on loans acquired with deteriorated credit quality 5,519 22,253 22,605
Loans, net of unearned income:      
Balance at end of period acquired with deteriorated credit quality 168,330 229,521 280,668
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 1,501 2,236 2,320
Loans, net of unearned income:      
Balance at end of period acquired with deteriorated credit quality 26,841 31,146 32,732
Receivables Acquired with Deteriorated Credit Quality | Residential Mortgage      
Financing Receivable, Reserve For Unfunded Commitments      
Allowance on loans acquired with deteriorated credit quality 5,892 5,804 6,882
Loans, net of unearned income:      
Balance at end of period acquired with deteriorated credit quality 93,208 138,381 122,952
Receivables Acquired with Deteriorated Credit Quality | Consumer and Other Loans      
Financing Receivable, Reserve For Unfunded Commitments      
Allowance on loans acquired with deteriorated credit quality 51 3,591 4,405
Loans, net of unearned income:      
Balance at end of period acquired with deteriorated credit quality $ 75,034 $ 82,507 $ 93,834