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MORTGAGE LOAN RECEIVABLES - Additional Information (Details)
3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2018
USD ($)
Jun. 30, 2019
USD ($)
loan
Dec. 31, 2018
USD ($)
loan
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
loan
Jun. 30, 2018
USD ($)
Dec. 31, 2017
Feb. 28, 2019
USD ($)
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]                  
Unamortized discounts included in mortgage loan receivables held for investment, at amortized cost   $ 300,000 $ 500,000     $ 300,000      
Provision for loan losses   300,000     $ 300,000 600,000 $ 3,300,000    
Loans nonaccrual status, amount   36,946,000 $ 36,850,000     36,946,000      
Real estate acquired through foreclosure   18,200,000       18,200,000      
Real Estate Acquired in Satisfaction of Debt                  
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]                  
Unamortized discounts included in mortgage loan receivables held for investment, at amortized cost   100,000       100,000      
Loans in default, no losses expected   17,800,000       17,800,000      
Accrued interest           200,000      
Real Estate Acquired in Satisfaction of Debt | Omaha, Nebraska                  
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]                  
Real estate acquired through foreclosure   $ 18,200,000       $ 18,200,000     $ 18,200,000
Minimum                  
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]                  
Direct capitalization rate 4.70%         4.60%   4.35%  
Maximum                  
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]                  
Number of mortgage loans impaired | loan   3 3     3      
Direct capitalization rate 5.00%         4.90%   4.65%  
Mortgage loan receivables held for investment, net, at amortized cost                  
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]                  
Loans receivable with variable rates of interest   $ 2,500,000,000 $ 2,500,000,000     $ 2,500,000,000      
Loans receivable with variable rates of interest   79.30% 75.40%     79.30%      
Loans receivable with variable rates of interest, subject to interest rate floors   100.00% 100.00%     100.00%      
Mortgage loan receivables held for investment, net, at amortized cost | Two Of Company Loans                  
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]                  
Number or loans in default | loan           2      
Loans in default, carrying value   $ 26,900,000       $ 26,900,000      
Loan reserve amount $ 2,700,000                
Mortgage loan receivables held for investment, net, at amortized cost | One Of Company Loans                  
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]                  
Loans in default, carrying value     $ 45,000,000.0            
Mortgage loan receivables held for investment, net, at amortized cost | One Of Company Loans | Series A                  
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]                  
Loans in default, carrying value     35,000,000.0            
Mortgage loan receivables held for investment, net, at amortized cost | One Of Company Loans | Series B                  
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]                  
Loans in default, carrying value     $ 10,000,000.0            
Mortgage loan receivables held for investment, net, at amortized cost | One Of Company Loans | Minimum                  
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]                  
Percentage of equity kicker not subject to investment     19.00%            
Mortgage loan receivables held for investment, net, at amortized cost | One Of Company Loans | Maximum                  
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]                  
Percentage of equity kicker not subject to investment     25.00%            
Mortgage loan receivables held for investment, net, at amortized cost | Asset Specific Reserve, Company Loan                  
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]                  
Loan reserve amount       $ 10,000,000.0          
Mortgage loan receivables held for sale                  
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]                  
Loans receivable with fixed rates of interest   $ 112,100,000 $ 182,400,000     $ 112,100,000      
Percentage of loans receivable with fixed rates of interest   100.00% 100.00%     100.00%      
Loan on non-accrual status                  
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]                  
Loans nonaccrual status, amount   $ 0 $ 0     $ 0