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Income Taxes - Reconciliation between applicable income taxes and statutory federal tax rate (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Tax amount
Taxes at statutory federal income tax rate	$ 3,221	$ 3,168	$ 7,395	$ 4,596
Tax effect of tax exempt income	(148)	(127)	(301)	(247)
Tax effect of other	571	572	1,212	701
Total income tax expense	$ 3,644	$ 3,613	$ 8,306	$ 5,050
Percentage of pretax income
Taxes at statutory federal income tax rate (as percentage)	21.00%	21.00%	21.00%	21.00%
Tax effect of tax exempt income (as percentage)	(1.00%)	(0.80%)	(0.90%)	(1.10%)
Tax effect of other (as percentage)	3.70%	3.80%	3.40%	3.20%
Applicable income taxes (as percentage)	23.70%	24.00%	23.50%	23.10%

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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 adjustments.

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