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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
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Financing Receivable, Allowance for Credit Losses    
Allowance for loan losses at beginning of period $ 140,891 $ 144,719
Provision for (Reversal of) loan losses 7,986 6,154
Transfer of balance to OREO and other (47) 73
Loans charged-off (9,116) (7,291)
Recoveries 4,813 1,235
Allowance for loan losses at end of period 144,527 144,890
Financing Receivable, Reserve For Unfunded Commitments    
Reserve for unfunded commitments at beginning of period 13,208 11,241
Provision for (Reversal of) unfunded commitments 224 419
Reserve for unfunded commitments at end of period 13,432 11,660
Allowance on loans individually evaluated for impairment 19,698 28,809
Allowance on loans collectively evaluated for impairment 90,696 80,926
Allowance on loans acquired with deteriorated credit quality 157,959 156,550
Loans, net of unearned income:    
Loans, net of unearned income 21,706,090 15,132,202
Balance at end of period individually evaluated for impairment 196,532 269,112
Balance at end of period collectively evaluated for impairment 21,027,680 14,365,751
Commercial Loans | Real Estate    
Financing Receivable, Allowance for Credit Losses    
Allowance for loan losses at beginning of period 54,201 49,231
Provision for (Reversal of) loan losses 6,377 1,786
Transfer of balance to OREO and other (47) 377
Loans charged-off (114) (95)
Recoveries 191 196
Allowance for loan losses at end of period 60,608 51,495
Financing Receivable, Reserve For Unfunded Commitments    
Reserve for unfunded commitments at beginning of period 4,531 3,207
Provision for (Reversal of) unfunded commitments 1,476 1,379
Reserve for unfunded commitments at end of period 6,007 4,586
Allowance on loans individually evaluated for impairment 2,506 1,916
Allowance on loans collectively evaluated for impairment 35,871 26,872
Loans, net of unearned income:    
Loans, net of unearned income 9,248,951 7,021,341
Balance at end of period individually evaluated for impairment 78,489 74,351
Balance at end of period collectively evaluated for impairment 8,946,138 6,687,651
Commercial Loans | Commercial and industrial    
Financing Receivable, Allowance for Credit Losses    
Allowance for loan losses at beginning of period 53,916 60,939
Provision for (Reversal of) loan losses 294 2,557
Transfer of balance to OREO and other 0 (350)
Loans charged-off (5,378) (3,762)
Recoveries 3,698 84
Allowance for loan losses at end of period 52,530 59,468
Financing Receivable, Reserve For Unfunded Commitments    
Reserve for unfunded commitments at beginning of period 5,309 4,537
Provision for (Reversal of) unfunded commitments (1,004) (885)
Reserve for unfunded commitments at end of period 4,305 3,652
Allowance on loans individually evaluated for impairment 14,040 25,056
Allowance on loans collectively evaluated for impairment 36,208 32,383
Loans, net of unearned income:    
Loans, net of unearned income 5,325,682 3,975,734
Balance at end of period individually evaluated for impairment 78,725 164,405
Balance at end of period collectively evaluated for impairment 5,211,736 3,778,775
Residential Mortgage    
Financing Receivable, Allowance for Credit Losses    
Allowance for loan losses at beginning of period 9,117 11,249
Provision for (Reversal of) loan losses (686) (1,060)
Transfer of balance to OREO and other 0 2
Loans charged-off (105) (22)
Recoveries 22 43
Allowance for loan losses at end of period 8,348 10,212
Financing Receivable, Reserve For Unfunded Commitments    
Reserve for unfunded commitments at beginning of period 555 657
Provision for (Reversal of) unfunded commitments (15) (49)
Reserve for unfunded commitments at end of period 540 608
Allowance on loans individually evaluated for impairment 178 113
Allowance on loans collectively evaluated for impairment 2,073 3,907
Loans, net of unearned income:    
Loans, net of unearned income 3,971,067 1,296,358
Balance at end of period individually evaluated for impairment 6,041 5,048
Balance at end of period collectively evaluated for impairment 3,826,721 1,176,017
Consumer and Other Loans    
Financing Receivable, Allowance for Credit Losses    
Allowance for loan losses at beginning of period 23,657 23,300
Provision for (Reversal of) loan losses 2,001 2,871
Transfer of balance to OREO and other 0 44
Loans charged-off (3,519) (3,412)
Recoveries 902 912
Allowance for loan losses at end of period 23,041 23,715
Financing Receivable, Reserve For Unfunded Commitments    
Reserve for unfunded commitments at beginning of period 2,813 2,840
Provision for (Reversal of) unfunded commitments (233) (26)
Reserve for unfunded commitments at end of period 2,580 2,814
Allowance on loans individually evaluated for impairment 2,974 1,724
Allowance on loans collectively evaluated for impairment 16,544 17,764
Loans, net of unearned income:    
Loans, net of unearned income 3,160,390 2,838,769
Balance at end of period individually evaluated for impairment 33,277 25,308
Balance at end of period collectively evaluated for impairment 3,043,085 2,723,308
Receivables Acquired with Deteriorated Credit Quality    
Financing Receivable, Reserve For Unfunded Commitments    
Allowance on loans acquired with deteriorated credit quality 34,133 35,155
Loans, net of unearned income:    
Balance at end of period acquired with deteriorated credit quality 481,878 497,339
Receivables Acquired with Deteriorated Credit Quality | Commercial Loans | Real Estate    
Financing Receivable, Reserve For Unfunded Commitments    
Allowance on loans acquired with deteriorated credit quality 22,231 22,707
Loans, net of unearned income:    
Balance at end of period acquired with deteriorated credit quality 224,324 259,339
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 2,282 2,029
Loans, net of unearned income:    
Balance at end of period acquired with deteriorated credit quality 35,221 32,554
Receivables Acquired with Deteriorated Credit Quality | Residential Mortgage    
Financing Receivable, Reserve For Unfunded Commitments    
Allowance on loans acquired with deteriorated credit quality 6,097 6,192
Loans, net of unearned income:    
Balance at end of period acquired with deteriorated credit quality 138,305 115,293
Receivables Acquired with Deteriorated Credit Quality | Consumer and Other Loans    
Financing Receivable, Reserve For Unfunded Commitments    
Allowance on loans acquired with deteriorated credit quality 3,523 4,227
Loans, net of unearned income:    
Balance at end of period acquired with deteriorated credit quality $ 84,028 $ 90,153