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Loans, Allowance for Credit Losses, and Asset Quality Information - Unfunded Loan Commitments (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning balance | $ 65,022 | $ 42,342 | $ 52,388 | $ 21,398 | $ 21,398
Charge-offs | (1,105) | (668) | (5,553) | (6,441) | (8,502)
Recoveries | 1,111 | 1,432 | 3,618 | 3,261 | 4,453
Provisions/(Reversals) | (1,400) | 6,120 | (1,400) | 31,008 | 35,039
Ending balance | 63,628 | $ 49,226 | 63,628 | $ 49,226 | 52,388
Cumulative Effect, Period Of Adoption, Adjustment |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning balance |  |  | 14,575 |  |
Ending balance |  |  |  |  | 14,575
Unfunded Loan Commitment |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning balance |  |  | 582 |  |
Charge-offs |  |  | 0 |  |
Recoveries |  |  | 0 |  |
Provisions/(Reversals) |  |  | 2,988 |  |
Ending balance | $ 11,074 |  | 11,074 |  | 582
Unfunded Loan Commitment | Cumulative Effect, Period Of Adoption, Adjustment |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning balance |  |  | $ 7,504 |  |
Ending balance |  |  |  |  | $ 7,504

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