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Income Taxes - Reconciliation between applicable income taxes and statutory federal tax rate (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Tax amount    
Taxes at statutory federal income tax rate $ 4,174 $ 1,428
Tax effect of tax exempt income (153) (121)
Tax effect of other 641 130
Total income tax expense $ 4,662 $ 1,437
Percentage of pretax income    
Taxes at statutory federal income tax rate (as percentage) 21.00% 21.00%
Tax effect of tax exempt income (as percentage) (0.80%) (1.80%)
Tax effect of other (as percentage) 3.20% 1.90%
Applicable income taxes (as percentage) 23.40% 21.10%