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LOANS - Schedule of Outstanding Principal Balance and Carrying Amounts for Acquired Credit-Impaired Loans (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Receivables [Abstract]    
Outstanding principal balance $ 23,163 $ 27,034
Carrying amount 18,397 21,295
Allowance for loan losses $ 326 $ 358