Fair value - Carrying amounts and estimated fair value of the company's (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Financial assets
Investment securities available for sale, at fair value	$ 132,235	$ 133,853
Loans held for sale	6,900	2,300
Fair Value, Inputs, Level 1 [Member] | Reported Value Measurement [Member]
Financial assets
Cash	12,881	12,062
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member]
Financial assets
Cash	12,881	12,062
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member]
Financial assets
Cash equivalents	13,101	4,616
Investment securities available for sale, at fair value	130,187	131,853
Federal Home Loan Bank stock	2,265	1,223
Loans held for sale	6,887	2,268
Bank owned life insurance	12,947	12,798
Accrued interest receivable	3,482	3,651
Interest rate lock commitments	205	142
Financial liabilities
Deposits	628,382	624,743
FHLB borrowings	45,000	20,000
Trust preferred securities	8,764	8,764
Other borrowings	5,700	5,692
Accrued interest payable	270	70
Forward sales commitment	370	207
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member]
Financial assets
Cash equivalents	13,101	4,616
Investment securities available for sale, at fair value	130,187	131,853
Federal Home Loan Bank stock	2,265	1,223
Loans held for sale	6,887	2,268
Bank owned life insurance	12,947	12,798
Accrued interest receivable	3,482	3,651
Interest rate lock commitments	205	142
Financial liabilities
Deposits	627,547	625,037
FHLB borrowings	44,799	20,000
Trust preferred securities	9,059	7,066
Other borrowings	5,700	5,692
Accrued interest payable	270	70
Forward sales commitment	370	207
Fair Value, Inputs, Level 3 [Member] | Reported Value Measurement [Member]
Financial assets
Investment securities available for sale, at fair value	2,048	2,000
Loans	556,170	538,427
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member]
Financial assets
Investment securities available for sale, at fair value	2,048	2,000
Loans	$ 524,518	$ 521,150