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
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