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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Unamortized Net Costs and Premiums (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
LOANS AND ALLOWANCE FOR CREDIT LOSSES    
Unamortized net loan origination costs $ 4,015 $ 5,157
Unamortized net premium on purchased loans (65) (85)
Total unamortized net costs and premiums $ 3,950 $ 5,072