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RELATED PARTY TRANSACTIONS - Summary of related party loan transactions (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Receivables, Other, Related Parties and Retainage [Abstract]    
Balance at January 1 $ 12,658 $ 13,520
Exposure of directors/executive officers added 0 0
Borrowings 5,110 1,312
Directors/executive officers resigned or retired from board (647) 0
Loan repayments (9,894) (2,174)
Balance at December 31 $ 7,227 $ 12,658