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Loans and Allowance for Credit Losses - Schedule of Activity in Allowance for Loan Losses (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Balance at Beginning of Period | $ 54,619 | [1] | $ 55,461 |  | $ 50,381
Charge-offs | (15,553) |  |  |  | (12,969)
Recoveries | 12,580 |  |  |  | 11,083
Provision for Credit Losses | 38,395 |  |  |  | 6,966
Balance at End of Period | 131,388 | [1] | 54,619 | [1] | 55,461
Previously Reported |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Balance at Beginning of Period | 54,619 |  | 55,461 |  |
Charge-offs |  |  | (14,789) |  |
Recoveries |  |  | 9,200 |  |
Provision for Credit Losses |  |  | 4,747 |  |
Balance at End of Period |  |  | 54,619 |  | 55,461
Adjustment |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Balance at Beginning of Period | 41,347 |  |  |  |
Balance at End of Period |  |  | 41,347 |  |
Adjusted Balance |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Balance at Beginning of Period | 95,966 |  |  |  |
Balance at End of Period | 131,388 |  | 95,966 |  |
Commercial |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Balance at Beginning of Period | 21,359 |  | 21,742 |  | 19,246
Charge-offs | (5,593) |  |  |  | (3,087)
Recoveries | 3,629 |  |  |  | 1,519
Provision for Credit Losses | 4,022 |  |  |  | 4,064
Balance at End of Period | 30,567 |  | 21,359 |  | 21,742
Commercial | Previously Reported |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Balance at Beginning of Period | 22,585 |  | 21,742 |  |
Charge-offs |  |  | (3,819) |  |
Recoveries |  |  | 1,650 |  |
Provision for Credit Losses |  |  | 3,012 |  |
Balance at End of Period |  |  | 22,585 |  | 21,742
Commercial | Adjustment |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Balance at Beginning of Period | 7,150 |  |  |  |
Balance at End of Period |  |  | 7,150 |  |
Commercial | Adjusted Balance |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Balance at Beginning of Period | 28,509 |  |  |  |
Balance at End of Period |  |  | 28,509 |  |
Commercial real estate |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Balance at Beginning of Period | 20,535 |  | 23,470 |  | 21,436
Charge-offs | (4,323) |  |  |  | (879)
Recoveries | 4,515 |  |  |  | 2,740
Provision for Credit Losses | 29,535 |  |  |  | 173
Balance at End of Period | 75,810 |  | 20,535 |  | 23,470
Commercial real estate | Previously Reported |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Balance at Beginning of Period | 21,588 |  | 23,470 |  |
Charge-offs |  |  | (2,846) |  |
Recoveries |  |  | 3,774 |  |
Provision for Credit Losses |  |  | (2,810) |  |
Balance at End of Period |  |  | 21,588 |  | 23,470
Commercial real estate | Adjustment |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Balance at Beginning of Period | 25,548 |  |  |  |
Balance at End of Period |  |  | 25,548 |  |
Commercial real estate | Adjusted Balance |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Balance at Beginning of Period | 46,083 |  |  |  |
Balance at End of Period |  |  | 46,083 |  |
BBCC |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Balance at Beginning of Period | 2,279 |  |  |  |
Charge-offs | (95) |  |  |  |
Recoveries | 140 |  |  |  |
Provision for Credit Losses | 94 |  |  |  |
Balance at End of Period | 6,120 |  | 2,279 |  |
BBCC | Adjustment |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Balance at Beginning of Period | 3,702 |  |  |  |
Balance at End of Period |  |  | 3,702 |  |
BBCC | Adjusted Balance |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Balance at Beginning of Period | 5,981 |  |  |  |
Balance at End of Period |  |  | 5,981 |  |
Residential real estate |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Balance at Beginning of Period | 2,299 |  | 2,277 |  | 1,763
Charge-offs | (824) |  |  |  | (1,100)
Recoveries | 633 |  |  |  | 2,118
Provision for Credit Losses | 3,514 |  |  |  | (504)
Balance at End of Period | 12,608 |  | 2,299 |  | 2,277
Residential real estate | Previously Reported |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Balance at Beginning of Period | 2,299 |  | 2,277 |  |
Charge-offs |  |  | (661) |  |
Recoveries |  |  | 146 |  |
Provision for Credit Losses |  |  | 537 |  |
Balance at End of Period |  |  | 2,299 |  | 2,277
Residential real estate | Adjustment |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Balance at Beginning of Period | 6,986 |  |  |  |
Balance at End of Period |  |  | 6,986 |  |
Residential real estate | Adjusted Balance |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Balance at Beginning of Period | 9,285 |  |  |  |
Balance at End of Period |  |  | 9,285 |  |
Consumer |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Balance at Beginning of Period |  |  | 7,972 |  | 7,936
Charge-offs |  |  |  |  | (7,903)
Recoveries |  |  |  |  | 4,706
Provision for Credit Losses |  |  |  |  | 3,233
Balance at End of Period |  |  |  |  | 7,972
Consumer | Previously Reported |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Balance at Beginning of Period | 8,147 |  | 7,972 |  |
Charge-offs |  |  | (7,463) |  |
Recoveries |  |  | 3,630 |  |
Provision for Credit Losses |  |  | 4,008 |  |
Balance at End of Period |  |  | 8,147 |  | $ 7,972
Indirect |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Balance at Beginning of Period | 5,319 |  |  |  |
Charge-offs | (2,754) |  |  |  |
Recoveries | 1,922 |  |  |  |
Provision for Credit Losses | 762 |  |  |  |
Balance at End of Period | 3,580 |  | 5,319 |  |
Indirect | Adjustment |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Balance at Beginning of Period | (1,669) |  |  |  |
Balance at End of Period |  |  | (1,669) |  |
Indirect | Adjusted Balance |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Balance at Beginning of Period | 3,650 |  |  |  |
Balance at End of Period |  |  | 3,650 |  |
Direct |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Balance at Beginning of Period | 1,863 |  |  |  |
Charge-offs | (1,763) |  |  |  |
Recoveries | 819 |  |  |  |
Provision for Credit Losses | 995 |  |  |  |
Balance at End of Period | 855 |  | 1,863 |  |
Direct | Adjustment |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Balance at Beginning of Period | (1,059) |  |  |  |
Balance at End of Period |  |  | (1,059) |  |
Direct | Adjusted Balance |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Balance at Beginning of Period | 804 |  |  |  |
Balance at End of Period |  |  | 804 |  |
Home equity |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Balance at Beginning of Period | 965 |  |  |  |
Charge-offs | (201) |  |  |  |
Recoveries | 922 |  |  |  |
Provision for Credit Losses | (527) |  |  |  |
Balance at End of Period | 1,848 |  | 965 |  |
Home equity | Adjustment |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Balance at Beginning of Period | 689 |  |  |  |
Balance at End of Period |  |  | 689 |  |
Home equity | Adjusted Balance |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Balance at Beginning of Period | $ 1,654 |  |  |  |
Balance at End of Period |  |  | $ 1,654 |  |
[1] | Beginning January 1, 2020, calculation is based on current expected loss methodology. Prior to January 1, 2020, calculation was based on incurred loss methodology.

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