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Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2023 | Jan. 01, 2023 | Dec. 31, 2022
Summary of Significant Accounting Policies |  |  |
Accrued interest receivable on available-for-sale debt securities | $ 2,500,000 |  |
Accrued interest receivable on loans receivable | 1,200,000 |  |
Amount of loans evaluated for determination of allowance for credit losses | 100,000 |  |
Retained earnings | 42,629,000 |  | $ 41,945,000
Loans | $ 462,730,000 |  | $ 458,823,000
Cumulative effect of adoption of ASU 2016-13 | ASU No. 2016-13 |  |  |
Summary of Significant Accounting Policies |  |  |
Retained earnings |  | $ 2,088,000 |
Cumulative effect of adoption of ASU 2016-13 | ASU No. 2016-13 | Loans other than unfunded loan commitments |  |  |
Summary of Significant Accounting Policies |  |  |
Loans |  | 1,911,000 |
Cumulative effect of adoption of ASU 2016-13 | ASU No. 2016-13 | Unfunded loan commitments |  |  |
Summary of Significant Accounting Policies |  |  |
Loans |  | $ 177,000 |

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