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MORTGAGE LOAN RECEIVABLES - Provision for Loan Losses (Details)
$ in Thousands
12 Months Ended
Jan. 01, 2020
USD ($)
Mar. 31, 2018
USD ($)
loans
Dec. 31, 2020
USD ($)
loan
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
security
Dec. 31, 2016
USD ($)
security
Oct. 17, 2018
USD ($)
Allowance for Loan and Lease Losses [Roll Forward]              
Provision for loan losses at beginning of period $ 20,500   $ 20,500 $ 17,900 $ 4,000    
Provision for current expected credit loss (implementation impact) 5,800   18,543 2,600 13,900    
Foreclosure of loans subject to asset-specific reserve     (2,500) 0 0    
Provision for loan losses at end of period     41,507 20,500 17,900    
Principal balance of loans on non-accrual status     175,022 86,025      
Principal balance of loans on non-accrual status     175,022 86,025      
Additional asset-specific reserve     9,200 2,000 12,700    
General reserve     9,400 600 1,200    
Provision for (release of) loan loss reserves     18,275 2,600 13,900    
Held-to-maturity Securities              
Allowance for Loan and Lease Losses [Roll Forward]              
Unfunded commitments of mortgage loan receivables held for investment (800)   (300)        
Provision for (release of) loan loss reserves $ 22   (2)        
Cumulative Effect, Period Of Adoption, Adjusted Balance              
Allowance for Loan and Lease Losses [Roll Forward]              
Provision for current expected credit loss (implementation impact)     4,964 $ 0 0    
Total mortgage loan receivables held for investment, net, at amortized cost              
Allowance for Loan and Lease Losses [Roll Forward]              
Principal balance of loans on non-accrual status     $ 45,000       $ 45,000
Number or loans in default | loan     3        
Principal balance of loans on non-accrual status     $ 45,000       45,000
Total mortgage loan receivables held for investment, net, at amortized cost | Two Company Loans              
Allowance for Loan and Lease Losses [Roll Forward]              
Principal balance of loans on non-accrual status     $ 24,200   $ 44,600 $ 26,900  
Number or loans in default     2   2 2  
Principal balance of loans on non-accrual status     $ 24,200   $ 44,600 $ 26,900  
Total mortgage loan receivables held for investment, net, at amortized cost | Two Of Company Loans 1              
Allowance for Loan and Lease Losses [Roll Forward]              
Principal balance of loans on non-accrual status     $ 27,100        
Number or loans in default | loan     2        
Principal balance of loans on non-accrual status     $ 27,100        
Total mortgage loan receivables held for investment, net, at amortized cost | One Company Loan              
Allowance for Loan and Lease Losses [Roll Forward]              
Principal balance of loans on non-accrual status   $ 5,900 $ 36,400   $ 45,000    
Number or loans in default   1 1   1 1  
Principal balance of loans on non-accrual status   $ 5,900 $ 36,400   $ 45,000    
Total mortgage loan receivables held for investment, net, at amortized cost | One Company Loan | Series B              
Allowance for Loan and Lease Losses [Roll Forward]              
Principal balance of loans on non-accrual status     400       10,000
Principal balance of loans on non-accrual status     400       $ 10,000
Total mortgage loan receivables held for investment, net, at amortized cost | One Of Company Loans 1              
Allowance for Loan and Lease Losses [Roll Forward]              
Principal balance of loans on non-accrual status     $ 13,000        
Number or loans in default | loan     1        
Principal balance of loans on non-accrual status     $ 13,000        
Total mortgage loan receivables held for investment, net, at amortized cost | One Of Company Loans 2              
Allowance for Loan and Lease Losses [Roll Forward]              
Principal balance of loans on non-accrual status     $ 30,600        
Number or loans in default | loan     1        
Principal balance of loans on non-accrual status     $ 30,600        
Total mortgage loan receivables held for investment, net, at amortized cost | One Of Company Loans 3              
Allowance for Loan and Lease Losses [Roll Forward]              
Principal balance of loans on non-accrual status     $ 43,800        
Number or loans in default | loan     1        
Principal balance of loans on non-accrual status     $ 43,800        
Total mortgage loan receivables held for investment, net, at amortized cost | Asset Specific Reserve, Company Loan              
Allowance for Loan and Lease Losses [Roll Forward]              
Principal balance of loans on non-accrual status     61,500        
Principal balance of loans on non-accrual status     $ 61,500        
Total mortgage loan receivables held for investment, net, at amortized cost | Two Of Company Loans 2              
Allowance for Loan and Lease Losses [Roll Forward]              
Number or loans in default | loan     2