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Income Taxes - Schedule of provision for income taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income Taxes      
Taxes currently payable $ 16,025 $ 25,259 $ 15,375
Deferred income taxes (benefit) 3,712 (11,480) 1,074
Income taxes $ 19,737 $ 13,779 $ 16,449