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Income Taxes - Expense (Benefit) Reconciliation (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Income Taxes        
Statutory federal income tax rate (as a percent)     21.00% 21.00%
Tax at the statutory federal rate $ 6,704 $ 5,273 $ 7,596 $ 4,847
State income taxes (net of federal benefit) 1,124 884 1,274 813
Tax credits (93) (251) (93) (251)
Other permanent items (36) 1 (26) 3
Total income tax expense $ 7,699 $ 5,907 $ 8,751 $ 5,412