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Income Taxes - Expense (benefit) reconciliation (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Income Taxes          
Statutory federal income tax rate (as a percent)     21.00%   21.00%
Tax at the federal statutory rate $ 2,140 $ 1,854 $ 6,986 $ 5,278  
State income taxes (net of federal benefit) 359 311 1,172 885  
Change in state tax rate   1,187   1,187  
Tax credits (85)   (336)    
Other 27 (349) 30 (252)  
Total income tax (benefit) expense $ 2,441 $ 3,003 $ 7,852 $ 7,098