Fair value - Carrying amounts and estimated fair value of the company's (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Financial assets
Investment securities available for sale, at fair value	$ 83,124	$ 105,585
Loans held for sale	8,200	5,000
Fair Value, Inputs, Level 1 | Reported Value Measurement
Financial assets
Cash	17,154	10,383
Fair Value, Inputs, Level 1 | Estimate of Fair Value Measurement
Financial assets
Cash	17,154	10,383
Fair Value, Inputs, Level 2 | Reported Value Measurement
Financial assets
Cash equivalents	1,337	7,331
Investment securities available for sale, at fair value	82,624	105,085
Restricted stock	2,277	2,985
Loans held for sale	8,236	4,983
Bank owned life insurance	13,291	13,120
Accrued interest receivable	3,857	3,827
Interest rate lock commitments	237	271
Financial liabilities
Deposits	628,912	605,345
FHLB borrowings	30,000	45,000
Trust preferred securities	8,764	8,764
Other borrowings	5,700	5,700
Accrued interest payable	489	210
Forward sales commitment	22	506
Fair Value, Inputs, Level 2 | Estimate of Fair Value Measurement
Financial assets
Cash equivalents	1,337	7,331
Investment securities available for sale, at fair value	82,624	105,085
Restricted stock	2,277	2,985
Loans held for sale	8,236	4,983
Bank owned life insurance	13,291	13,120
Accrued interest receivable	3,857	3,827
Interest rate lock commitments	237	271
Financial liabilities
Deposits	628,932	605,226
FHLB borrowings	29,854	44,999
Trust preferred securities	8,920	8,848
Other borrowings	5,700	5,700
Accrued interest payable	489	210
Forward sales commitment	22	506
Fair Value, Inputs, Level 3 | Reported Value Measurement
Financial assets
Investment securities available for sale, at fair value	500	500
Loans	605,408	575,008
Fair Value, Inputs, Level 3 | Estimate of Fair Value Measurement
Financial assets
Investment securities available for sale, at fair value	500	500
Loans	$ 582,559	$ 547,935