Income Taxes - Reconciliation between applicable income taxes and statutory federal tax rate (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2022	Mar. 31, 2021
Tax amount
Taxes at statutory federal income tax rate	$ 2,745	$ 4,174
Tax exempt income	(117)	(153)
State income taxes, net of federal benefits	579	854
Nondeductible items and other	(319)	(213)
Applicable income taxes	$ 2,888	$ 4,662
Percentage of pretax income
Taxes at statutory federal income tax rate (as percentage)	21.00%	21.00%
Tax exempt income (as percentage)	(0.90%)	(0.80%)
State income taxes, net of federal benefits (as percentage)	4.40%	4.30%
Nondeductible items and other (as percentage)	(2.40%)	(1.10%)
Applicable income taxes (as percentage)	22.10%	23.40%

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other nondeductible expenses.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other nondeductible expenses.

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