Fair Value Measurements - Fair value of assets measured at fair value on a recurring basis (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Securities available-for-sale:
Equity securities, at fair value	$ 2,960	$ 2,792
Fair Value, Recurring
Securities available-for-sale:
Equity securities, at fair value	2,960	2,792
Loan servicing rights	47	22
Total assets at fair value	162,790	173,653
Liabilities:
Total liabilities at fair value	1,026	846
Fair Value, Recurring | Interest Rate Swap [Member]
Securities available-for-sale:
Interest rate swap agreements	1,026
Total assets at fair value		846
Liabilities:
Interest rate swap agreements	1,026	846
Fair Value, Recurring | U.S. Treasuries
Securities available-for-sale:
Securities available-for-sale, at fair value	37,119	42,977
Fair Value, Recurring | U.S. government and federal agencies
Securities available-for-sale:
Securities available-for-sale, at fair value	13,274	13,275
Fair Value, Recurring | Corporate bonds
Securities available-for-sale:
Securities available-for-sale, at fair value	2,649	2,523
Fair Value, Recurring | U.S. agency collateralized mortgage obligations
Securities available-for-sale:
Securities available-for-sale, at fair value	33,471	34,310
Fair Value, Recurring | Tax-exempt municipal
Securities available-for-sale:
Securities available-for-sale, at fair value	1,199	1,231
Fair Value, Recurring | Taxable municipal
Securities available-for-sale:
Securities available-for-sale, at fair value	588	587
Fair Value, Recurring | U.S. agency mortgage-backed
Securities available-for-sale:
Securities available-for-sale, at fair value	70,457	75,090
Fair Value, Recurring | Fair Value, Inputs, Level 1
Securities available-for-sale:
Equity securities, at fair value	2,960	2,792
Total assets at fair value	2,960	2,792
Fair Value, Recurring | Fair Value, Inputs, Level 2
Securities available-for-sale:
Total assets at fair value	159,783	170,839
Liabilities:
Total liabilities at fair value	1,026	846
Fair Value, Recurring | Fair Value, Inputs, Level 2 | Interest Rate Swap [Member]
Securities available-for-sale:
Interest rate swap agreements	1,026
Total assets at fair value		846
Liabilities:
Interest rate swap agreements	1,026	846
Fair Value, Recurring | Fair Value, Inputs, Level 2 | U.S. Treasuries
Securities available-for-sale:
Securities available-for-sale, at fair value	37,119	42,977
Fair Value, Recurring | Fair Value, Inputs, Level 2 | U.S. government and federal agencies
Securities available-for-sale:
Securities available-for-sale, at fair value	13,274	13,275
Fair Value, Recurring | Fair Value, Inputs, Level 2 | Corporate bonds
Securities available-for-sale:
Securities available-for-sale, at fair value	2,649	2,523
Fair Value, Recurring | Fair Value, Inputs, Level 2 | U.S. agency collateralized mortgage obligations
Securities available-for-sale:
Securities available-for-sale, at fair value	33,471	34,310
Fair Value, Recurring | Fair Value, Inputs, Level 2 | Tax-exempt municipal
Securities available-for-sale:
Securities available-for-sale, at fair value	1,199	1,231
Fair Value, Recurring | Fair Value, Inputs, Level 2 | Taxable municipal
Securities available-for-sale:
Securities available-for-sale, at fair value	588	587
Fair Value, Recurring | Fair Value, Inputs, Level 2 | U.S. agency mortgage-backed
Securities available-for-sale:
Securities available-for-sale, at fair value	70,457	75,090
Fair Value, Recurring | Fair Value, Inputs, Level 3
Securities available-for-sale:
Loan servicing rights	47	22
Total assets at fair value	$ 47	$ 22