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Income Taxes - Expense (Benefit) Reconciliation (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Income Taxes    
Statutory federal income tax rate (as a percent) 21.00% 21.00%
Tax at the statutory federal rate $ 892 $ (426)
State income taxes (net of federal benefit) 150 (71)
Other permanent items 10 2
Total income tax expense (benefit) $ 1,052 $ (495)