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BORROWINGS - Narrative (Details) - USD ($)
Mar. 31, 2018
Dec. 31, 2017
Debt Disclosure [Abstract]    
Weighted average interest rate, percentage 1.88% 1.56%
Repurchase agreement covenant, minimum stockholders' equity $ 75,000,000  
Repurchase agreement covenant, minimum stockholders' equity, percentage of historical stockholders' equity 50.00%