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Income Taxes - Schedule of provision for income taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Taxes      
Taxes currently payable $ 25,259 $ 15,375 $ 19,291
Deferred income taxes (benefit) (11,480) 1,074 (4,450)
Income taxes $ 13,779 $ 16,449 $ 14,841