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COMMITMENTS AND CONTINGENCIES - Schedule of Commitments and Letters of Credit (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Commitments to extend credit    
Other Commitments [Line Items]    
Off-balance sheet liability $ 342,523 $ 326,879
Letters of credit    
Other Commitments [Line Items]    
Off-balance sheet liability $ 11,675 $ 8,336