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DERIVATIVE FINANCIAL INSTRUMENTS - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Derivative [Line Items]          
Ineffectiveness included in net income     $ 0   $ 0
Interest expense $ 3,063,000 $ 2,759,000 8,951,000 $ 8,176,000  
Unrealized loss to be reclassified as a reduction of interest expense     0    
Designated as Hedging Instrument | Cash Flow Hedging | Interest Rate Swap          
Derivative [Line Items]          
Notional amount $ 5,000,000   5,000,000   $ 5,000,000
Interest expense     $ 559,000 $ 656,000