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Loans and Allowance for Credit Losses - Schedule of Activity in Troubled Debt Restructurings (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Financing Receivable, Troubled Debt Restructuring [Roll Forward] |  |  |
Balance at beginning of period | $ 31,738 | $ 43,710 | $ 54,003
(Charge-offs)/ Recoveries | 5,450 |  | 431
(Payments)/ Disbursements | (14,167) |  | (16,415)
Additions | 9,632 |  | 5,691
Balance at end of period | 32,653 | 31,738 | 43,710
Previously Reported |  |  |
Financing Receivable, Troubled Debt Restructuring [Roll Forward] |  |  |
Balance at beginning of period | 31,738 | 43,710 |
(Charge-offs)/ Recoveries |  | (4,010) |
(Payments)/ Disbursements |  | (29,093) |
Additions |  | 21,131 |
Balance at end of period |  | 31,738 | 43,710
Commercial |  |  |
Financing Receivable, Troubled Debt Restructuring [Roll Forward] |  |  |
Balance at beginning of period | 12,412 | 10,275 | 12,088
(Charge-offs)/ Recoveries | 633 |  | (169)
(Payments)/ Disbursements | (4,557) |  | (5,188)
Additions | 2,602 |  | 3,544
Balance at end of period | 11,090 | 12,412 | 10,275
Commercial | Previously Reported |  |  |
Financing Receivable, Troubled Debt Restructuring [Roll Forward] |  |  |
Balance at beginning of period | 14,862 | 10,275 |
(Charge-offs)/ Recoveries |  | (1,911) |
(Payments)/ Disbursements |  | (3,733) |
Additions |  | 10,231 |
Balance at end of period |  | 14,862 | 10,275
Commercial real estate |  |  |
Financing Receivable, Troubled Debt Restructuring [Roll Forward] |  |  |
Balance at beginning of period | 14,277 | 27,671 | 34,705
(Charge-offs)/ Recoveries | 4,801 |  | 561
(Payments)/ Disbursements | (8,502) |  | (8,808)
Additions | 7,030 |  | 1,213
Balance at end of period | 17,606 | 14,277 | 27,671
Commercial real estate | Previously Reported |  |  |
Financing Receivable, Troubled Debt Restructuring [Roll Forward] |  |  |
Balance at beginning of period | 12,404 | 27,671 |
(Charge-offs)/ Recoveries |  | (2,112) |
(Payments)/ Disbursements |  | (23,182) |
Additions |  | 10,027 |
Balance at end of period |  | 12,404 | 27,671
BBCC |  |  |
Financing Receivable, Troubled Debt Restructuring [Roll Forward] |  |  |
Balance at beginning of period | 578 |  |
(Charge-offs)/ Recoveries | (19) |  |
(Payments)/ Disbursements | (447) |  |
Additions | 0 |  |
Balance at end of period | 112 | 578 |
Residential real estate |  |  |
Financing Receivable, Troubled Debt Restructuring [Roll Forward] |  |  |
Balance at beginning of period | 3,107 | 3,390 | 3,315
(Charge-offs)/ Recoveries | 0 |  | 23
(Payments)/ Disbursements | (283) |  | (450)
Additions | 0 |  | 502
Balance at end of period | 2,824 | 3,107 | 3,390
Residential real estate | Previously Reported |  |  |
Financing Receivable, Troubled Debt Restructuring [Roll Forward] |  |  |
Balance at beginning of period | 2,976 | 3,390 |
(Charge-offs)/ Recoveries |  | 0 |
(Payments)/ Disbursements |  | (971) |
Additions |  | 557 |
Balance at end of period |  | 2,976 | 3,390
Indirect |  |  |
Financing Receivable, Troubled Debt Restructuring [Roll Forward] |  |  |
Balance at beginning of period | 0 |  |
(Charge-offs)/ Recoveries | 9 |  |
(Payments)/ Disbursements | (9) |  |
Additions | 0 |  |
Balance at end of period | 0 | 0 |
Direct |  |  |
Financing Receivable, Troubled Debt Restructuring [Roll Forward] |  |  |
Balance at beginning of period | 983 |  |
(Charge-offs)/ Recoveries | 23 |  |
(Payments)/ Disbursements | (267) |  |
Additions | 0 |  |
Balance at end of period | 739 | 983 |
Home equity |  |  |
Financing Receivable, Troubled Debt Restructuring [Roll Forward] |  |  |
Balance at beginning of period | 381 |  |
(Charge-offs)/ Recoveries | 3 |  |
(Payments)/ Disbursements | (102) |  |
Additions | 0 |  |
Balance at end of period | 282 | 381 |
Consumer |  |  |
Financing Receivable, Troubled Debt Restructuring [Roll Forward] |  |  |
Balance at beginning of period |  | 2,374 | 3,895
(Charge-offs)/ Recoveries |  |  | 16
(Payments)/ Disbursements |  |  | (1,969)
Additions |  |  | 432
Balance at end of period |  |  | 2,374
Consumer | Previously Reported |  |  |
Financing Receivable, Troubled Debt Restructuring [Roll Forward] |  |  |
Balance at beginning of period | $ 1,496 | 2,374 |
(Charge-offs)/ Recoveries |  | 13 |
(Payments)/ Disbursements |  | (1,207) |
Additions |  | 316 |
Balance at end of period |  | $ 1,496 | $ 2,374

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