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SUBSEQUENT EVENT (Details) - USD ($)
3 Months Ended
May 08, 2018
Mar. 31, 2018
Mar. 31, 2017
Apr. 25, 2018
Subsequent Event [Line Items]        
Gain (loss) on sale   $ 918,000 $ 1,407,000  
Subsequent Event        
Subsequent Event [Line Items]        
Line of credit facility, maximum borrowing capacity       $ 100,000,000.0
Performing loans $ 15,100,000      
Gain (loss) on sale $ 0      
Revolving Credit Facility        
Subsequent Event [Line Items]        
Line of credit facility, maximum borrowing capacity   30,000,000.0    
Principal amount outstanding   0    
Line of credit facility, remaining borrowing capacity   $ 30,000,000    
Revolving Credit Facility | London Interbank Offered Rate (LIBOR)        
Subsequent Event [Line Items]        
Basis spread on variable rate   3.50%