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Loans and Allowance for Credit Losses - Schedule of Activity in Allowance for Loan Losses (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Balance at Beginning of Period | $ 109,444 | $ 128,394 | $ 131,388 | $ 54,619
Charge-offs | (1,215) | (4,169) | (3,765) | (14,846)
Recoveries | 4,252 | 7,163 | 7,143 | 10,773
Provision for credit losses | (4,613) | 0 | (26,898) | 39,495
Balance at End of Period | 107,868 | 131,388 | 107,868 | 131,388
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Balance at Beginning of Period |  |  |  | 41,347
Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Balance at Beginning of Period | 109,444 | 128,394 | 131,388 | 95,966
Commercial |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Balance at Beginning of Period | 25,731 | 29,618 | 30,567 | 21,359
Charge-offs | (354) | (128) | (940) | (5,303)
Recoveries | 106 | 2,192 | 549 | 3,100
Provision for credit losses | 677 | (3,289) | (4,016) | 2,087
Balance at End of Period | 26,160 | 28,393 | 26,160 | 28,393
Commercial | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Balance at Beginning of Period |  |  |  | 7,150
Commercial | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Balance at Beginning of Period | 25,731 | 29,618 | 30,567 | 28,509
Commercial real estate |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Balance at Beginning of Period | 65,469 | 71,069 | 75,810 | 20,535
Charge-offs | (86) | (2,709) | (264) | (5,164)
Recoveries | 3,371 | 3,379 | 3,555 | 4,297
Provision for credit losses | (3,657) | 4,173 | (14,004) | 30,696
Balance at End of Period | 65,097 | 75,912 | 65,097 | 75,912
Commercial real estate | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Balance at Beginning of Period |  |  |  | 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 | 65,469 | 71,069 | 75,810 | 46,083
BBCC |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Balance at Beginning of Period | 2,798 | 6,332 | 6,120 | 2,279
Charge-offs | (8) | (10) | (144) | (92)
Recoveries | 31 | 0 | 87 | 122
Provision for credit losses | (259) | 15 | (3,501) | 326
Balance at End of Period | 2,562 | 6,337 | 2,562 | 6,337
BBCC | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Balance at Beginning of Period |  |  |  | 3,702
BBCC | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Balance at Beginning of Period | 2,798 | 6,332 | 6,120 | 5,981
Residential real estate |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Balance at Beginning of Period | 10,419 | 14,244 | 12,608 | 2,299
Charge-offs | (85) | (321) | (305) | (637)
Recoveries | 79 | 220 | 217 | 431
Provision for credit losses | (887) | (219) | (2,994) | 4,845
Balance at End of Period | 9,526 | 13,924 | 9,526 | 13,924
Residential real estate | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Balance at Beginning of Period |  |  |  | 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 | 10,419 | 14,244 | 12,608 | 9,285
Indirect |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Balance at Beginning of Period | 2,043 | 4,453 | 3,580 | 5,319
Charge-offs | (113) | (556) | (903) | (2,125)
Recoveries | 294 | 587 | 1,395 | 1,494
Provision for credit losses | (363) | (394) | (2,211) | 1,071
Balance at End of Period | 1,861 | 4,090 | 1,861 | 4,090
Indirect | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Balance at Beginning of Period |  |  |  | (1,669)
Indirect | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Balance at Beginning of Period | 2,043 | 4,453 | 3,580 | 3,650
Direct |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Balance at Beginning of Period | 640 | 835 | 855 | 1,863
Charge-offs | (355) | (445) | (913) | (1,326)
Recoveries | 153 | 187 | 622 | 571
Provision for credit losses | 148 | 248 | 22 | 776
Balance at End of Period | 586 | 825 | 586 | 825
Direct | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Balance at Beginning of Period |  |  |  | (1,059)
Direct | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Balance at Beginning of Period | 640 | 835 | 855 | 804
Home equity |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Balance at Beginning of Period | 2,344 | 1,843 | 1,848 | 965
Charge-offs | (214) | 0 | (296) | (199)
Recoveries | 218 | 598 | 718 | 758
Provision for credit losses | (272) | (534) | (194) | (306)
Balance at End of Period | 2,076 | 1,907 | 2,076 | 1,907
Home equity | Cumulative Effect, Period of Adoption, Adjustment |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Balance at Beginning of Period |  |  |  | 689
Home equity | Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Balance at Beginning of Period | $ 2,344 | $ 1,843 | $ 1,848 | $ 1,654

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