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Loans and Investments - Non-performing Loans (Details)
 12 Months Ended
Dec. 31, 2021
USD ($)
loan
Dec. 31, 2020
USD ($)
loan
Dec. 31, 2019
loan
Non-performing loans by asset class      
Number of loans for which no provision for loan loss made | loan 0 0 0
Number of loans | loan 580 328  
Carrying value of loans $ 12,158,995,000    
Amortized cost of loans on nonaccrual status 0    
UPB 159,940,000 $ 282,785,000  
Financing Receivable, before Allowance for Credit Loss $ 12,158,995,000 $ 5,475,082,000  
Non-performing loans      
Non-performing loans by asset class      
Number of loans | loan 3 7  
Carrying value of loans $ 20,100,000 $ 53,800,000  
Loan loss reserves 2,600,000 6,500,000  
UPB 24,120,000 62,325,000  
Interest Receivable 0    
Greater than 90 Days Past Due      
Non-performing loans by asset class      
Past Due 0 0  
Greater than 90 Days Past Due | Non-performing loans      
Non-performing loans by asset class      
Financing Receivable, before Allowance for Credit Loss 24,120,000 62,325,000  
Interest Receivable 0 0  
Student Housing | Non-performing loans      
Non-performing loans by asset class      
UPB 21,500,000 36,500,000  
Student Housing | Greater than 90 Days Past Due | Non-performing loans      
Non-performing loans by asset class      
Financing Receivable, before Allowance for Credit Loss 21,500,000 36,500,000  
Multifamily Portfolio | Non-performing loans      
Non-performing loans by asset class      
UPB   17,700,000  
Multifamily Portfolio | Greater than 90 Days Past Due | Non-performing loans      
Non-performing loans by asset class      
Financing Receivable, before Allowance for Credit Loss   17,700,000  
Healthcare      
Non-performing loans by asset class      
UPB   4,625,000  
Healthcare | Non-performing loans      
Non-performing loans by asset class      
UPB   4,625,000  
Healthcare | Greater than 90 Days Past Due | Non-performing loans      
Non-performing loans by asset class      
Financing Receivable, before Allowance for Credit Loss   4,625,000  
Retail      
Non-performing loans by asset class      
UPB 22,045,000 30,079,000  
Retail | Non-performing loans      
Non-performing loans by asset class      
UPB 920,000 920,000  
Retail | Greater than 90 Days Past Due | Non-performing loans      
Non-performing loans by asset class      
Financing Receivable, before Allowance for Credit Loss 920,000 920,000  
Commercial      
Non-performing loans by asset class      
UPB 1,700,000 1,700,000  
Commercial | Non-performing loans      
Non-performing loans by asset class      
UPB 1,700,000 1,700,000  
Commercial | Greater than 90 Days Past Due | Non-performing loans      
Non-performing loans by asset class      
Financing Receivable, before Allowance for Credit Loss 1,700,000 1,700,000  
Office      
Non-performing loans by asset class      
UPB $ 1,980,000 2,166,000  
Office | Non-performing loans      
Non-performing loans by asset class      
UPB   880,000  
Office | Greater than 90 Days Past Due | Non-performing loans      
Non-performing loans by asset class      
Financing Receivable, before Allowance for Credit Loss   $ 880,000