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PREMISES AND EQUIPMENT - Additional information (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
PREMISES AND EQUIPMENT      
Depreciation $ 1,500,000 $ 1,500,000 $ 1,700,000
Director [Member]      
PREMISES AND EQUIPMENT      
Related Party Transaction, Amounts of Transaction $ 218,000 $ 221,000 $ 216,000