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REAL ESTATE - Additional Information (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
property
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
property
Sep. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Real Estate Properties [Line Items]          
Real estate acquired in settlement of residential mortgage loans $ 0   $ 0   $ 0
Number of commercial real estate acquisitions | property 0   0    
Proceeds from sales of real estate     $ 6,661,000 $ 0  
Recognized gain on sale of real estate     $ 2,700,000    
Weighted average amortization period     5 years 2 months 12 days    
General and Administrative Expense          
Real Estate Properties [Line Items]          
Depreciation expense $ 6,000,000.0 $ 4,500,000 $ 17,800,000 $ 11,900,000