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COMMITMENTS AND CONTINGENCIES (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Standby letters of credit    
COMMITMENTS AND CONTINGENCIES    
Financial instruments off-balance sheet credit risks $ 10,235 $ 10,031
Commitments to extend credit    
COMMITMENTS AND CONTINGENCIES    
Financial instruments off-balance sheet credit risks $ 523,646 $ 530,191