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Income taxes - Reconciliation of Effective Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income taxes
Provision for income tax at statutory rate	$ 9,527	$ 11,239	$ 7,177
State tax, net of federal benefit	216	475
Tax exempt interest	(1,400)	(1,194)	(1,032)
Bank owned life insurance income	(205)	(119)	(299)
Residential housing program tax credits	(911)	(1,091)	(1,094)
Other, net	49	688	69
Total income tax expense	$ 7,276	$ 9,998	$ 4,821
Provision for income tax at statutory rate	21.00%	21.00%	21.00%
State tax, net of federal benefit	0.63%	0.89%
Tax exempt interest	(3.09%)	(2.23%)	(3.02%)
Bank owned life insurance income	(0.45%)	(0.22%)	(0.87%)
Residential housing program tax credits	(2.01%)	(2.04%)	(3.20%)
Other, net	(0.04%)	1.29%	0.19%
Total income tax expense	16.04%	18.69%	14.10%

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US Percentage of reported income tax expense (benefit) in excess of (less than) expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operations, attributable to Tax Cuts and Jobs Act.

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