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Borrowings and Other Obligations - Subordinated Debt (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Mar. 15, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2013
Debt Instrument [Line Items] |  |  |  |  |
Accretion of discount on subordinated debenture |  |  | $ 1,347 | $ 52 |
Subordinated debenture | NorCal Community Bancorp Trust II |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Contractual value of subordinated debt |  |  |  |  | $ 4,100
Repayments of debt | $ 2,800 |  |  |  |
Effective interest rate |  | 6.00% | 251.50% | 6.00% |
Accretion of discount on subordinated debenture |  | $ 17 | $ 1,300 | $ 52 |

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