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COMMITMENTS AND CONTINGENCIES - Narrative (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Other Commitments [Line Items]      
FHLB letters of credit $ 52,000,000    
Operating leases, rent expense 919,000 $ 717,000 $ 474,000
Letters of credit      
Other Commitments [Line Items]      
Potential guarantee obligation $ 0 $ 0