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INCOME TAXES, Provision for Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Provision for income taxes [Abstract]                      
Currently payable                 $ 3,503 $ 3,838 $ 4,583
Change in corporate tax rate                 0 0 1,531
Deferred tax liability (asset)                 317 (435) (83)
Provision for income taxes $ 1,003 $ 1,066 $ 930 $ 821 $ 845 $ 936 $ 875 $ 747 $ 3,820 $ 3,403 $ 6,031