Commitments and contingencies (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total commitments to extend credit	$ 124,152	$ 126,356
Standby letters of Credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total commitments to extend credit	557	4,680
Undisbursed credit lines
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total commitments to extend credit	110,269	103,125
Commitments to extend or originate credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total commitments to extend credit	$ 13,326	$ 18,551