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Income Taxes - Reconciliation between applicable income taxes and statutory federal tax rate (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Tax amount
Taxes at statutory federal income tax rate									$ 12,289	$ 8,168	$ 6,938
Tax effect of tax exempt income									(527)	(442)	(365)
State income taxes, net of federal benefits									2,522	1,618	1,399
Nondeductible items and other									(441)	12	(800)
Total income tax expense	$ 3,144	$ 5,648	$ 3,613	$ 1,437	$ 2,131	$ 2,332	$ 2,869	$ 2,024	$ 13,843	$ 9,356	$ 7,172
Percentage of pretax income
Taxes at statutory federal income tax rate (as percentage)									21.00%	21.00%	21.00%
Tax effect of tax exempt income (as percentage)									(0.90%)	(1.10%)	(1.10%)
State income taxes, net of federal benefits (as percentage)									4.30%	4.20%	4.20%
Nondeductible items and other (as percentage)									(0.80%)		(2.40%)
Applicable income taxes (as percentage)									23.60%	24.10%	21.70%

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- Definition

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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