Commitments and contingencies (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total commitments to extend credit	$ 118,657	$ 126,356
Standby letters of Credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total commitments to extend credit	515	4,680
Undisbursed credit lines
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total commitments to extend credit	98,503	103,125
Commitments to extend or originate credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total commitments to extend credit	$ 19,639	$ 18,551