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Commitments and Contingencies - Commitments to Extend Credit and Letters of Credit (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020
--- | --- | --- | ---
Commitments to Extend Credit |  |  |
Loan Commitments and Letters of Credit [Line Items] |  |  |
Notional Amount | $ 431,452 | $ 399,882 | $ 364,861
Fair Value | 0 | 0 | 0
Standby Letters of Credit |  |  |
Loan Commitments and Letters of Credit [Line Items] |  |  |
Notional Amount | 3,392 | 3,703 | 3,330
Fair Value | $ 21 | $ 28 | $ 30
Minimum | Standby Letters of Credit |  |  |
Loan Commitments and Letters of Credit [Line Items] |  |  |
Loan commitments, fixed fee percent | 1.00% |  |
Maximum | Standby Letters of Credit |  |  |
Loan Commitments and Letters of Credit [Line Items] |  |  |
Loan commitments, fixed fee percent | 3.00% |  |

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