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Participations Sold (Details)
$ in Thousands, £ in Millions
 1 Months Ended 12 Months Ended
Jun. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2021
GBP (£)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2020
GBP (£)
Oct. 31, 2020
USD ($)
Participating Mortgage Loans [Line Items]              
Payment in kind interest   $ 47,700   $ 46,700 $ 54,600    
Total carrying value, net   7,857,260   6,496,977      
Commercial Mortgage Portfolio Segment              
Participating Mortgage Loans [Line Items]              
Total carrying value, net [1],[2]   7,012,312   5,451,084      
Participations sold balance, increase   17,800          
Participations sold balance, increase, add on funding amount   18,300 £ 13.3        
Unrealized loss on foreign currency translation   $ 500          
Mezzanine Loans              
Participating Mortgage Loans [Line Items]              
Debt instrument, decrease in participating interest $ 27,700            
Payment in kind interest $ 2,700            
Mezzanine Loans | Secured Debt              
Participating Mortgage Loans [Line Items]              
Total carrying value, net       95,200   £ 70.3  
Mezzanine Loans | Ground-up Condominium Development - New York              
Participating Mortgage Loans [Line Items]              
Debt instrument, face amount             $ 25,000
Mezzanine Loans | Office Building - London              
Participating Mortgage Loans [Line Items]              
Debt instrument, face amount       8,900   6.7  
Remaining unfunded commitment       $ 25,300   £ 19.1  
[1] Includes $5,957,707 and $5,418,999 pledged as collateral under secured debt arrangements in 2021 and 2020, respectively.
[2] Net of $178,588 and $213,102 CECL Allowances in 2021 and 2020, respectively, comprised of $145,000 and $175,000 Specific CECL Allowance and $33,588 and $38,102 General CECL Allowance, respectively.