Commitments and contingencies (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total commitments to extend credit	$ 159,311	$ 136,583
Standby letters of Credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total commitments to extend credit	1,203	1,202
Undisbursed credit lines
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total commitments to extend credit	146,306	127,918
Commitments to extend or originate credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total commitments to extend credit	$ 11,802	$ 7,463