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Subsequent Events (Details)
£ in Millions
 1 Months Ended
Feb. 09, 2021
USD ($)
Feb. 09, 2021
GBP (£)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Subsequent Event [Line Items]        
Commercial mortgage loans, net     $ 6,496,977,000 $ 6,375,093,000
Commercial Mortgage Portfolio Segment        
Subsequent Event [Line Items]        
Commercial mortgage loans, net [1],[2]     $ 5,451,084,000 $ 5,326,967,000
Subsequent Event        
Subsequent Event [Line Items]        
Funded amount of mortgages $ 43,200,000      
Proceeds from loan repayments 6,700,000      
Increase authorized repurchase amount 150,000,000.0      
Authorized amount 300,000,000.0      
Remaining authorized repurchase amount 172,300,000      
Subsequent Event | Commercial Mortgage Portfolio Segment        
Subsequent Event [Line Items]        
Investment in mortgage loans on real estate, face amount of mortgages 226,200,000 £ 165.0    
Commercial mortgage loans, net $ 2,500,000,000 £ 1,800.0    
[1] Includes $5,418,999 and $4,852,087 pledged as collateral under secured debt arrangements in 2020 and 2019, respectively
[2] Net of $213,102 CECL Allowances in 2020, comprised of $175,000 Specific CECL Allowance and $38,102 General CECL Allowance. Net of $56,981 provision for loan loss in 2019.