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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
6 Months Ended
Jun. 30, 2019
Jun. 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 24,067 15,581
Transfer of balance to OREO and other (2,863) (3,943)
Charge-offs (19,194) (22,734)
Recoveries 3,805 6,781
Allowance for loan and lease losses at end of period 146,386 136,576
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 451 325
Reserve for unfunded commitments at end of period 15,281 14,433
Allowance on loans individually evaluated for impairment 15,854 17,587
Allowance on loans collectively evaluated for impairment 119,240 103,861
Allowance on loans acquired with deteriorated credit quality 161,667 151,009
Loans and leases, net of unearned income:    
Balance at end of period 23,355,311 22,075,783
Balance at end of period individually evaluated for impairment 209,681 192,323
Balance at end of period collectively evaluated for impairment 22,837,328 21,445,962
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 15,204 (3,404)
Transfer of balance to OREO and other (256) (506)
Charge-offs (641) (1,258)
Recoveries 318 384
Allowance for loan and lease losses at end of period 66,431 49,417
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 603 467
Reserve for unfunded commitments at end of period 5,472 5,127
Allowance on loans individually evaluated for impairment 4,673 2,274
Allowance on loans collectively evaluated for impairment 56,251 40,763
Loans and leases, net of unearned income:    
Balance at end of period 9,818,270 9,292,304
Balance at end of period individually evaluated for impairment 74,331 84,217
Balance at end of period collectively evaluated for impairment 9,596,594 9,017,756
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 5,077 10,083
Transfer of balance to OREO and other (1) (18)
Charge-offs (11,880) (13,575)
Recoveries 1,796 4,403
Allowance for loan and lease losses at end of period 49,088 54,809
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 (313) (306)
Reserve for unfunded commitments at end of period 5,885 5,084
Allowance on loans individually evaluated for impairment 7,656 11,946
Allowance on loans collectively evaluated for impairment 39,854 40,540
Loans and leases, net of unearned income:    
Balance at end of period 6,161,759 5,512,416
Balance at end of period individually evaluated for impairment 54,860 66,683
Balance at end of period collectively evaluated for impairment 6,084,342 5,415,093
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 (584) 1,112
Transfer of balance to OREO and other (2,862) 6
Charge-offs (168) (196)
Recoveries 157 44
Allowance for loan and lease losses at end of period 9,541 10,083
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 (206) 160
Reserve for unfunded commitments at end of period 660 715
Allowance on loans individually evaluated for impairment 349 168
Allowance on loans collectively evaluated for impairment 5,127 3,816
Loans and leases, net of unearned income:    
Balance at end of period 4,538,194 4,124,538
Balance at end of period individually evaluated for impairment 41,363 5,873
Balance at end of period collectively evaluated for impairment 4,414,038 3,984,086
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 4,370 7,790
Transfer of balance to OREO and other 256 (3,425)
Charge-offs (6,505) (7,705)
Recoveries 1,534 1,950
Allowance for loan and lease losses at end of period 21,326 22,267
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 367 4
Reserve for unfunded commitments at end of period 3,264 3,507
Allowance on loans individually evaluated for impairment 3,176 3,199
Allowance on loans collectively evaluated for impairment 18,008 18,742
Loans and leases, net of unearned income:    
Balance at end of period 2,837,088 3,146,525
Balance at end of period individually evaluated for impairment 39,127 35,550
Balance at end of period collectively evaluated for impairment 2,742,354 3,029,027
Receivables Acquired with Deteriorated Credit Quality    
Financing Receivable, Reserve For Unfunded Commitments    
Allowance on loans acquired with deteriorated credit quality 11,292 15,128
Loans and leases, net of unearned income:    
Balance at end of period acquired with deteriorated credit quality 308,302 437,498
Receivables Acquired with Deteriorated Credit Quality | Commercial Loans | Real Estate    
Financing Receivable, Reserve For Unfunded Commitments    
Allowance on loans acquired with deteriorated credit quality 5,507 6,380
Loans and leases, net of unearned income:    
Balance at end of period acquired with deteriorated credit quality 147,345 190,331
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 1,578 2,323
Loans and leases, net of unearned income:    
Balance at end of period acquired with deteriorated credit quality 22,557 30,640
Receivables Acquired with Deteriorated Credit Quality | Residential mortgage loans    
Financing Receivable, Reserve For Unfunded Commitments    
Allowance on loans acquired with deteriorated credit quality 4,065 6,099
Loans and leases, net of unearned income:    
Balance at end of period acquired with deteriorated credit quality 82,793 134,579
Receivables Acquired with Deteriorated Credit Quality | Consumer and Other Loans    
Financing Receivable, Reserve For Unfunded Commitments    
Allowance on loans acquired with deteriorated credit quality 142 326
Loans and leases, net of unearned income:    
Balance at end of period acquired with deteriorated credit quality $ 55,607 $ 81,948