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Commitments and Contingencies - Summary of outstanding loan commitments, unused lines of credit and letters of credit (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Commitments and Contingencies |  |
Fair value disclosure, off-balance sheet risks, face amount, liability | $ 24,210 | $ 21,438
Other mortgage loans |  |
Commitments and Contingencies |  |
Fair value disclosure, off-balance sheet risks, face amount, liability | 8,952 | 9,280
Home-equity lines |  |
Commitments and Contingencies |  |
Fair value disclosure, off-balance sheet risks, face amount, liability | 10,817 | 10,142
Commercial lines |  |
Commitments and Contingencies |  |
Fair value disclosure, off-balance sheet risks, face amount, liability | 12,862 | 10,717
Unsecured consumer lines |  |
Commitments and Contingencies |  |
Fair value disclosure, off-balance sheet risks, face amount, liability | 532 | 579
Letters of credit |  |
Commitments and Contingencies |  |
Fair value disclosure, off-balance sheet risks, face amount, liability | $ 45 | $ 45

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