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Income Taxes - Components of income tax expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
Current Federal income tax expense $ 4,915 $ 5,747 $ 3,995
Current State income tax expense (benefit) 3,050 3,351 2,689
Total current income tax expense 7,965 9,098 6,684
Deferred Federal income tax expense (benefit) (656) (387) (140)
Deferred State income tax expense (benefit) (395) (202) 76
Total deferred income tax expense (benefit) (1,051) (589) (64)
Provision (benefit) from income taxes, Federal 4,259 5,360 3,855
Provision (benefit) from income taxes, State 2,655 3,149 2,765
Provision for income taxes $ 6,914 $ 8,509 $ 6,620