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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, 2024 | Dec. 31, 2023
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Commitments and Contingencies |  |
Fair value disclosure, off-balance sheet risks, face amount, liability | $ 29,093 | $ 24,210
Other mortgage loans |  |
Commitments and Contingencies |  |
Fair value disclosure, off-balance sheet risks, face amount, liability | 2,239 | 8,952
Home-equity lines |  |
Commitments and Contingencies |  |
Fair value disclosure, off-balance sheet risks, face amount, liability | 18,658 | 10,817
Commercial lines |  |
Commitments and Contingencies |  |
Fair value disclosure, off-balance sheet risks, face amount, liability | 9,913 | 12,862
Unsecured consumer lines |  |
Commitments and Contingencies |  |
Fair value disclosure, off-balance sheet risks, face amount, liability | 522 | 532
Letters of credit |  |
Commitments and Contingencies |  |
Fair value disclosure, off-balance sheet risks, face amount, liability | $ 255 | $ 45

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