Income Taxes - Reconciliation between applicable income taxes and statutory federal tax rate (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Tax amount
Taxes at statutory federal income tax rate	$ 2,444	$ 2,524	$ 4,648	$ 5,269
Tax exempt income	(156)	(122)	(300)	(239)
State income taxes, net of federal benefits	485	531	946	1,109
Nondeductible items and other	(238)	(208)	(453)	(526)
Applicable income taxes	$ 2,535	$ 2,725	$ 4,841	$ 5,613
Percentage of pretax income
Taxes at statutory federal income tax rate (as percentage)	21.00%	21.00%	21.00%	21.00%
Tax exempt income (as percentage)	(1.30%)	(1.00%)	(1.40%)	(1.00%)
State income taxes, net of federal benefits (as percentage)	4.10%	4.40%	4.30%	4.40%
Nondeductible items and other (as percentage)	(2.00%)	(1.70%)	(2.00%)	(2.10%)
Applicable income taxes (as percentage)	21.80%	22.70%	21.90%	22.30%