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Loans - Summary of Recorded Investment in Impaired Portfolio Loans by Category (Details) - Non-Covered Loans $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2020 loan | Sep. 30, 2020 loan | Sep. 30, 2021 USD ($) | Dec. 31, 2020 USD ($)
Financing Receivable, Past Due [Line Items] |  |  |  |
Total Recorded Investment |  |  | $ 41,554 | $ 38,507
Nonaccrual loans with no allowance |  |  | 16,936 |
Financing Receivable, Modifications, Number of Contracts | loan | 3 | 6 |  |
Nonaccrual |  |  | 38,591 | 34,818
Restructured, accruing |  |  | 2,947 | 3,559
Loans over 90 days past due and still accruing interest |  |  | 16 | 130
Commercial and industrial |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total Recorded Investment |  |  | 30,530 | 21,770
Nonaccrual loans with no allowance |  |  | 12,137 | 8,316
Financing Receivable, Modifications, Number of Contracts | loan | 2 | 3 |  |
Nonaccrual |  |  | 27,655 | 18,158
Restructured, accruing |  |  | 2,870 | 3,482
Loans over 90 days past due and still accruing interest |  |  | 5 | 130
Commercial - investor owned |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total Recorded Investment |  |  | 1,846 | 9,579
Nonaccrual loans with no allowance |  |  | 425 | 716
Nonaccrual |  |  | 1,846 | 9,579
Restructured, accruing |  |  | 0 | 0
Loans over 90 days past due and still accruing interest |  |  | 0 | 0
Commercial - owner occupied |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total Recorded Investment |  |  | 6,892 | 2,940
Nonaccrual loans with no allowance |  |  | 2,800 | 6,024
Nonaccrual |  |  | 6,892 | 2,940
Restructured, accruing |  |  | 0 | 0
Loans over 90 days past due and still accruing interest |  |  | 0 | 0
Construction and land development |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Nonaccrual loans with no allowance |  |  |  | 0
Residential real estate |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total Recorded Investment |  |  | 2,262 | 4,189
Nonaccrual loans with no allowance |  |  | 1,562 | 3,190
Financing Receivable, Modifications, Number of Contracts | loan | 1 | 3 |  |
Nonaccrual |  |  | 2,185 | 4,112
Restructured, accruing |  |  | 77 | 77
Loans over 90 days past due and still accruing interest |  |  | 0 | 0
Other |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Total Recorded Investment |  |  | 24 | 29
Nonaccrual loans with no allowance |  |  | 12 | 18,246
Nonaccrual |  |  | 13 | 29
Restructured, accruing |  |  | 0 | 0
Loans over 90 days past due and still accruing interest |  |  | $ 11 | $ 0

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