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Loans - Summary of Portfolio Loans Individually Evaluated for Impairment by Category (Details) - Portfolio loans, net - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Jun. 30, 2021 | Dec. 31, 2020 | Jun. 30, 2020 | Jan. 01, 2020 | Dec. 31, 2019
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |  |  |  |
Nonaccrual loans with no allowance | $ 16,936 |  | $ 16,936 |  |  |  |  |  |
Total nonperforming loans | 41,554 |  | 41,554 |  |  | $ 38,507 |  |  |
Financing Receivable, Allowance for Credit Loss, Writeoff | (4,251) | $ (2,584) | (12,558) | $ (6,552) |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Recovery | 2,401 | 1,557 | 4,192 | 5,714 |  |  |  |  |
Financing receivable, allowance for credit loss | 152,096 | 123,270 | 152,096 | 123,270 | $ 128,185 | 136,671 | $ 110,270 | $ 69,995 | $ 43,288
Commercial and industrial |  |  |  |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |  |  |  |
Nonaccrual loans with no allowance | 12,137 |  | 12,137 |  |  | 8,316 |  |  |
Total nonperforming loans | 30,530 |  | 30,530 |  |  | 21,770 |  |  |
Financing Receivable, Allowance for Credit Loss, Writeoff | (2,829) | (2,006) | (8,019) | (5,372) |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Recovery | 452 | 808 | 1,479 | 1,605 |  |  |  |  |
Financing receivable, allowance for credit loss | 61,887 | 57,870 | 61,887 | 57,870 | 53,351 | 58,812 | 50,139 | 33,949 | 27,455
Commercial - investor owned |  |  |  |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |  |  |  |
Nonaccrual loans with no allowance | 425 |  | 425 |  |  | 716 |  |  |
Total nonperforming loans | 1,846 |  | 1,846 |  |  | 9,579 |  |  |
Financing Receivable, Allowance for Credit Loss, Writeoff | (117) | (272) | (2,489) | (498) |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Recovery | 1,623 | 55 | 1,696 | 2,821 |  |  |  |  |
Financing receivable, allowance for credit loss | 42,635 | 29,671 | 42,635 | 29,671 | 36,003 | 32,062 | 25,019 | 16,656 | 5,935
Commercial - owner occupied |  |  |  |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |  |  |  |
Nonaccrual loans with no allowance | 2,800 |  | 2,800 |  |  | 6,024 |  |  |
Total nonperforming loans | 6,892 |  | 6,892 |  |  | 2,940 |  |  |
Financing Receivable, Allowance for Credit Loss, Writeoff | (259) | (30) | (503) | (30) |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Recovery | 15 | 268 | 34 | 348 |  |  |  |  |
Financing receivable, allowance for credit loss | 18,733 | 9,472 | 18,733 | 9,472 | 15,564 | 17,012 | 11,088 | 7,414 | 4,873
Construction and land development |  |  |  |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |  |  |  |
Nonaccrual loans with no allowance |  |  |  |  |  | 0 |  |  |
Financing Receivable, Allowance for Credit Loss, Writeoff | (3) | 0 | (3) | (31) |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Recovery | 171 | 83 | 438 | 152 |  |  |  |  |
Financing receivable, allowance for credit loss | 14,052 | 18,918 | 14,052 | 18,918 | 11,632 | 21,413 | 15,962 | 7,577 | 2,611
Residential real estate |  |  |  |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |  |  |  |
Nonaccrual loans with no allowance | 1,562 |  | 1,562 |  |  | 3,190 |  |  |
Total nonperforming loans | 2,262 |  | 2,262 |  |  | 4,189 |  |  |
Financing Receivable, Allowance for Credit Loss, Writeoff | (840) | (173) | (1,155) | (327) |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Recovery | 115 | 303 | 419 | 686 |  |  |  |  |
Financing receivable, allowance for credit loss | 9,223 | 5,331 | 9,223 | 5,331 | 4,677 | 4,585 | 6,333 | 3,349 | 1,280
Other |  |  |  |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |  |  |  |
Nonaccrual loans with no allowance | 12 |  | 12 |  |  | 18,246 |  |  |
Total nonperforming loans | 24 |  | 24 |  |  | 29 |  |  |
Financing Receivable, Allowance for Credit Loss, Writeoff | (203) | (103) | (389) | (294) |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Recovery | 25 | 40 | 126 | 102 |  |  |  |  |
Financing receivable, allowance for credit loss | $ 5,566 | $ 2,008 | $ 5,566 | $ 2,008 | $ 6,958 | $ 2,787 | $ 1,729 | $ 1,050 | $ 1,134

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