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Loans and Allowance for Credit Losses - Schedule of Activity in Allowance for Loan Losses (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Balance at Beginning of Period $ 131,388 $ 54,619
Charge-offs (1,570) (8,445)
Recoveries 1,575 1,909
Provision for Credit Losses (17,356) 16,950
Balance at End of Period 114,037 106,380
Cumulative Effect, Period of Adoption, Adjustment    
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Balance at Beginning of Period 0 41,347
Cumulative Effect, Period of Adoption, Adjusted Balance    
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Balance at Beginning of Period 131,388 95,966
Commercial    
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Balance at Beginning of Period 30,567 21,359
Charge-offs (407) (5,042)
Recoveries 238 357
Provision for Credit Losses (5,268) 7,301
Balance at End of Period 25,130 31,125
Commercial | Cumulative Effect, Period of Adoption, Adjustment    
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Balance at Beginning of Period 0 7,150
Commercial | Cumulative Effect, Period of Adoption, Adjusted Balance    
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Balance at Beginning of Period 30,567 28,509
Commercial real estate    
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Balance at Beginning of Period 75,810 20,535
Charge-offs (1) (1,292)
Recoveries 73 669
Provision for Credit Losses (5,321) 8,643
Balance at End of Period 70,561 54,103
Commercial real estate | Cumulative Effect, Period of Adoption, Adjustment    
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Balance at Beginning of Period 0 25,548
Commercial real estate | Cumulative Effect, Period of Adoption, Adjusted Balance    
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Balance at Beginning of Period 75,810 46,083
BBCC    
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Balance at Beginning of Period 6,120 2,279
Charge-offs (36) (15)
Recoveries 41 66
Provision for Credit Losses (3,588) (615)
Balance at End of Period 2,537 5,417
BBCC | Cumulative Effect, Period of Adoption, Adjustment    
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Balance at Beginning of Period 0 3,702
BBCC | Cumulative Effect, Period of Adoption, Adjusted Balance    
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Balance at Beginning of Period 6,120 5,981
Residential real estate    
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Balance at Beginning of Period 12,608 2,299
Charge-offs (158) (300)
Recoveries 87 169
Provision for Credit Losses (2,272) 483
Balance at End of Period 10,265 9,637
Residential real estate | Cumulative Effect, Period of Adoption, Adjustment    
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Balance at Beginning of Period 0 6,986
Residential real estate | Cumulative Effect, Period of Adoption, Adjusted Balance    
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Balance at Beginning of Period 12,608 9,285
Indirect    
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Balance at Beginning of Period 3,580 5,319
Charge-offs (584) (1,203)
Recoveries 537 414
Provision for Credit Losses (1,278) 805
Balance at End of Period 2,255 3,666
Indirect | Cumulative Effect, Period of Adoption, Adjustment    
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Balance at Beginning of Period 0 (1,669)
Indirect | Cumulative Effect, Period of Adoption, Adjusted Balance    
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Balance at Beginning of Period 3,580 3,650
Direct    
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Balance at Beginning of Period 855 1,863
Charge-offs (302) (475)
Recoveries 260 152
Provision for Credit Losses (148) 341
Balance at End of Period 665 822
Direct | Cumulative Effect, Period of Adoption, Adjustment    
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Balance at Beginning of Period 0 (1,059)
Direct | Cumulative Effect, Period of Adoption, Adjusted Balance    
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Balance at Beginning of Period 855 804
Home equity    
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Balance at Beginning of Period 1,848 965
Charge-offs (82) (118)
Recoveries 339 82
Provision for Credit Losses 519 (8)
Balance at End of Period 2,624 1,610
Home equity | Cumulative Effect, Period of Adoption, Adjustment    
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Balance at Beginning of Period 0 689
Home equity | Cumulative Effect, Period of Adoption, Adjusted Balance    
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Balance at Beginning of Period $ 1,848 $ 1,654