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OTHER REAL ESTATE OWNED - Activities in Other Real Estate Owned (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Other Real Estate and Foreclosed Assets [Roll Forward]      
Balance at beginning of year $ 0 $ 672 $ 1,796
Additions 1,116 276 672
Sales and net direct write-downs (1,116) (803) (2,038)
Net change in valuation allowance 0 (145) 242
Balance at end of year $ 0 $ 0 $ 672