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REAL ESTATE - Additional Information (Details)
3 Months Ended 12 Months Ended
Mar. 31, 2019
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
property
Dec. 31, 2017
USD ($)
Real Estate Properties [Line Items]        
Real estate acquired in settlement of residential mortgage loans     $ 0 $ 0
Number of commercial real estate acquired (property) | property     0  
Proceeds from sales of real estate $ 6,661,000 $ 0    
Gain on sale of real estate $ 2,700,000      
Weighted average amortization period 5 years      
General and Administrative Expense        
Real Estate Properties [Line Items]        
Depreciation expense $ 5,800,000 $ 3,700,000