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Income taxes - Reconciliation of Effective Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income taxes
Provision for income tax at statutory rate	$ 1,778	$ 6,825	$ 9,527
State tax, net of federal benefit	95	397	216
Tax exempt interest	(1,237)	(1,057)	(1,400)
Bank owned life insurance income	(360)	(221)	(205)
Residential housing program tax credits	(631)	(755)	(911)
Nondeductible transaction costs	206	179
Other, net	119	(247)	49
Total income tax (benefit) expense	$ (30)	$ 5,121	$ 7,276
Provision for income tax at statutory rate (as percentage)	21.00%	21.00%	21.00%
State tax, net of federal benefit (as percentage)	1.16%	1.22%	0.63%
Tax exempt interest (as percentage)	(14.61%)	(3.25%)	(3.09%)
Bank owned life insurance income (as percentage)	(4.25%)	(0.68%)	(0.45%)
Residential housing program tax credits (as percentage)	(7.45%)	(2.32%)	(2.01%)
Nondeductible transaction costs (as percentage)	2.43%	0.55%
Other, net (as percentage)	1.36%	(0.76%)	(0.04%)
Total (as percentage)	(0.36%)	15.76%	16.04%

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