Income Taxes - Reconciliation between applicable income taxes and statutory federal tax rate (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Tax amount
Taxes at statutory federal income tax rate	$ 2,424	$ 2,637	$ 7,071	$ 7,906
Tax exempt income	(189)	(133)	(489)	(372)
State income taxes, net of federal benefits	499	406	1,445	1,515
Nondeductible items and other	(353)	30	(805)	(496)
Applicable income taxes	$ 2,381	$ 2,940	$ 7,222	$ 8,553
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)	(1.60%)	(1.10%)	(1.50%)	(1.00%)
State income taxes, net of federal benefits (as percentage)	4.30%	3.20%	4.30%	4.00%
Nondeductible items and other (as percentage)	(3.10%)	0.20%	(2.40%)	(1.30%)
Applicable income taxes (as percentage)	20.60%	23.30%	21.40%	22.70%