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Schedule IV - Mortgage Loans on Real Estate - Summary of Loans (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
USD ($)
Item
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Investments in loans        
Carrying amount $ 18,413,649 $ 12,139,908 $ 11,470,224 $ 9,794,254
Basis spread on variable rate 4.10%      
Principal Amount of Delinquent Loans $ 462,880      
Federal income tax basis 16,400,000      
Commercial and Residential Lending Segment and Investing and Servicing Segment        
Investments in loans        
Carrying amount $ 16,368,799 $ 10,584,400 $ 9,890,693 $ 7,806,699
Aggregated First Mortgages | Hotel, International, Floating, 1 Mortgage        
Investments in loans        
Number of loans | Item 1      
Carrying amount $ 95,714      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Hotel, International, Floating, 1 Mortgage | Three Month EURIBOR        
Investments in loans        
Basis spread on variable rate 4.50%      
Aggregated First Mortgages | Hotel, International, Floating, 4 Mortgages        
Investments in loans        
Number of loans | Item 4      
Carrying amount $ 56,377      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Hotel, International, Floating, 4 Mortgages | LIBOR | Minimum        
Investments in loans        
Basis spread on variable rate 3.00%      
Aggregated First Mortgages | Hotel, International, Floating, 4 Mortgages | LIBOR | Maximum        
Investments in loans        
Basis spread on variable rate 9.00%      
Aggregated First Mortgages | Hotel, Mid Atlantic, Floating        
Investments in loans        
Number of loans | Item 5      
Carrying amount $ 111,785      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Hotel, Mid Atlantic, Floating | LIBOR | Minimum        
Investments in loans        
Basis spread on variable rate 2.00%      
Aggregated First Mortgages | Hotel, Mid Atlantic, Floating | LIBOR | Maximum        
Investments in loans        
Basis spread on variable rate 6.80%      
Aggregated First Mortgages | Hotel, Midwest, Floating        
Investments in loans        
Number of loans | Item 4      
Carrying amount $ 53,482      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Hotel, Midwest, Floating | LIBOR | Minimum        
Investments in loans        
Basis spread on variable rate 2.25%      
Aggregated First Mortgages | Hotel, Midwest, Floating | LIBOR | Maximum        
Investments in loans        
Basis spread on variable rate 8.63%      
Aggregated First Mortgages | Hotel, North East, Floating        
Investments in loans        
Number of loans | Item 4      
Carrying amount $ 313,059      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Hotel, North East, Floating | LIBOR | Minimum        
Investments in loans        
Basis spread on variable rate 2.25%      
Aggregated First Mortgages | Hotel, North East, Floating | LIBOR | Maximum        
Investments in loans        
Basis spread on variable rate 7.92%      
Aggregated First Mortgages | Hotel, South East, Floating        
Investments in loans        
Number of loans | Item 10      
Carrying amount $ 224,800      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Hotel, South East, Floating | LIBOR | Minimum        
Investments in loans        
Basis spread on variable rate 2.40%      
Aggregated First Mortgages | Hotel, South East, Floating | LIBOR | Maximum        
Investments in loans        
Basis spread on variable rate 13.27%      
Aggregated First Mortgages | Hotel, South West, Floating        
Investments in loans        
Number of loans | Item 10      
Carrying amount $ 178,590      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Hotel, South West, Floating | LIBOR | Minimum        
Investments in loans        
Basis spread on variable rate 2.00%      
Aggregated First Mortgages | Hotel, South West, Floating | LIBOR | Maximum        
Investments in loans        
Basis spread on variable rate 7.67%      
Aggregated First Mortgages | Hotel, Various, Fixed        
Investments in loans        
Number of loans | Item 2      
Carrying amount $ 68,402      
Interest rate 10.50%      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Hotel, Various, Floating        
Investments in loans        
Number of loans | Item 12      
Carrying amount $ 468,593      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Hotel, Various, Floating | LIBOR | Minimum        
Investments in loans        
Basis spread on variable rate 2.00%      
Aggregated First Mortgages | Hotel, Various, Floating | LIBOR | Maximum        
Investments in loans        
Basis spread on variable rate 11.75%      
Aggregated First Mortgages | Hotel, West, Floating        
Investments in loans        
Number of loans | Item 19      
Carrying amount $ 413,824      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Hotel, West, Floating | LIBOR | Minimum        
Investments in loans        
Basis spread on variable rate 2.00%      
Aggregated First Mortgages | Hotel, West, Floating | LIBOR | Maximum        
Investments in loans        
Basis spread on variable rate 9.50%      
Aggregated First Mortgages | Industrial, International, Floating, 6 Mortgages        
Investments in loans        
Number of loans | Item 6      
Carrying amount $ 107,097      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Industrial, International, Floating, 6 Mortgages | Three Month BBSY | Minimum        
Investments in loans        
Basis spread on variable rate 3.00%      
Aggregated First Mortgages | Industrial, International, Floating, 6 Mortgages | Three Month BBSY | Maximum        
Investments in loans        
Basis spread on variable rate 3.25%      
Aggregated First Mortgages | Industrial, International, Floating, 5 Mortgages        
Investments in loans        
Number of loans | Item 5      
Carrying amount $ 102,199      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Industrial, International, Floating, 5 Mortgages | Three Month EURIBOR | Minimum        
Investments in loans        
Basis spread on variable rate 2.25%      
Aggregated First Mortgages | Industrial, International, Floating, 5 Mortgages | Three Month EURIBOR | Maximum        
Investments in loans        
Basis spread on variable rate 10.25%      
Aggregated First Mortgages | Industrial, International, Floating, 2 Mortgages        
Investments in loans        
Number of loans | Item 2      
Carrying amount $ 88,310      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Industrial, International, Floating, 2 Mortgages | Three Month GBP SONIA | Minimum        
Investments in loans        
Basis spread on variable rate 2.15%      
Aggregated First Mortgages | Industrial, International, Floating, 2 Mortgages | Three Month GBP SONIA | Maximum        
Investments in loans        
Basis spread on variable rate 4.50%      
Aggregated First Mortgages | Industrial, North East, Floating, 4 Mortgages        
Investments in loans        
Number of loans | Item 4      
Carrying amount $ 123,057      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Industrial, North East, Floating, 4 Mortgages | LIBOR | Minimum        
Investments in loans        
Basis spread on variable rate 2.40%      
Aggregated First Mortgages | Industrial, North East, Floating, 4 Mortgages | LIBOR | Maximum        
Investments in loans        
Basis spread on variable rate 7.25%      
Aggregated First Mortgages | Industrial, North East, Floating, 1 Mortgage        
Investments in loans        
Number of loans | Item 1      
Carrying amount $ 16,736      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Industrial, North East, Floating, 1 Mortgage | SOFR        
Investments in loans        
Basis spread on variable rate 4.20%      
Aggregated First Mortgages | Industrial, South East, Fixed        
Investments in loans        
Number of loans | Item 4      
Carrying amount $ 34,644      
Interest rate 8.18%      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Industrial, West, Floating        
Investments in loans        
Number of loans | Item 2      
Carrying amount $ 90,029      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Industrial, West, Floating | LIBOR | Minimum        
Investments in loans        
Basis spread on variable rate 1.75%      
Aggregated First Mortgages | Industrial, West, Floating | LIBOR | Maximum        
Investments in loans        
Basis spread on variable rate 7.50%      
Aggregated First Mortgages | Mixed Use, International, Fixed        
Investments in loans        
Number of loans | Item 2      
Carrying amount $ 41,358      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Mixed Use, International, Fixed | Minimum        
Investments in loans        
Interest rate 8.50%      
Aggregated First Mortgages | Mixed Use, International, Fixed | Maximum        
Investments in loans        
Interest rate 10.00%      
Aggregated First Mortgages | Mixed Use, International, Floating, 2 Mortgages        
Investments in loans        
Number of loans | Item 2      
Carrying amount $ 104,056      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Mixed Use, International, Floating, 2 Mortgages | Three Month EURIBOR        
Investments in loans        
Basis spread on variable rate 4.65%      
Aggregated First Mortgages | Mixed Use, International, Floating, 1 Mortgage, 2025 Maturity        
Investments in loans        
Number of loans | Item 1      
Carrying amount $ 483,107      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Mixed Use, International, Floating, 1 Mortgage, 2025 Maturity | Three Month GBP SONIA        
Investments in loans        
Basis spread on variable rate 5.35%      
Aggregated First Mortgages | Mixed Use, International, Floating, 1 Mortgage, 2022 Maturity        
Investments in loans        
Number of loans | Item 1      
Carrying amount $ 233,027      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Mixed Use, International, Floating, 1 Mortgage, 2022 Maturity | GBP SONIA        
Investments in loans        
Basis spread on variable rate 4.00%      
Aggregated First Mortgages | Mixed Use, Mid Atlantic, Floating        
Investments in loans        
Number of loans | Item 1      
Carrying amount $ 172,562      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Mixed Use, Mid Atlantic, Floating | LIBOR        
Investments in loans        
Basis spread on variable rate 3.15%      
Aggregated First Mortgages | Mixed Use, South East, Floating        
Investments in loans        
Number of loans | Item 8      
Carrying amount $ 139,119      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Mixed Use, South East, Floating | LIBOR | Minimum        
Investments in loans        
Basis spread on variable rate 2.25%      
Aggregated First Mortgages | Mixed Use, South East, Floating | LIBOR | Maximum        
Investments in loans        
Basis spread on variable rate 11.14%      
Aggregated First Mortgages | Mixed Use, South West, Floating        
Investments in loans        
Number of loans | Item 10      
Carrying amount $ 320,862      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Mixed Use, South West, Floating | LIBOR | Minimum        
Investments in loans        
Basis spread on variable rate 2.75%      
Aggregated First Mortgages | Mixed Use, South West, Floating | LIBOR | Maximum        
Investments in loans        
Basis spread on variable rate 11.50%      
Aggregated First Mortgages | Multi-family, International, Floating, 1 Mortgage, 2024 Maturity, BBSY        
Investments in loans        
Number of loans | Item 1      
Carrying amount $ 151,578      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Multi-family, International, Floating, 1 Mortgage, 2024 Maturity, BBSY | Three Month BBSY        
Investments in loans        
Basis spread on variable rate 3.95%      
Aggregated First Mortgages | Multi-family, International, Floating, 1 Mortgage, 2024 Maturity, GBP        
Investments in loans        
Number of loans | Item 1      
Carrying amount $ 307,852      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Multi-family, International, Floating, 1 Mortgage, 2024 Maturity, GBP | Three Month GBP        
Investments in loans        
Basis spread on variable rate 3.95%      
Aggregated First Mortgages | Multi-family, International, Floating, 4 Mortgages        
Investments in loans        
Number of loans | Item 4      
Carrying amount $ 237,685      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Multi-family, International, Floating, 4 Mortgages | Three Month GBP SONIA        
Investments in loans        
Basis spread on variable rate 2.66%      
Aggregated First Mortgages | Multi-family, Mid Atlantic, Floating 6 Mortgages        
Investments in loans        
Number of loans | Item 6      
Carrying amount $ 229,881      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Multi-family, Mid Atlantic, Floating 6 Mortgages | LIBOR | Minimum        
Investments in loans        
Basis spread on variable rate 1.75%      
Aggregated First Mortgages | Multi-family, Mid Atlantic, Floating 6 Mortgages | LIBOR | Maximum        
Investments in loans        
Basis spread on variable rate 7.75%      
Aggregated First Mortgages | Multi-family, Mid Atlantic, Floating, 2 Mortgages        
Investments in loans        
Number of loans | Item 2      
Carrying amount $ 143,670      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Multi-family, Mid Atlantic, Floating, 2 Mortgages | SOFR | Minimum        
Investments in loans        
Basis spread on variable rate 2.25%      
Aggregated First Mortgages | Multi-family, Mid Atlantic, Floating, 2 Mortgages | SOFR | Maximum        
Investments in loans        
Basis spread on variable rate 9.00%      
Aggregated First Mortgages | Multi-family, Midwest, Fixed        
Investments in loans        
Number of loans | Item 1      
Carrying amount $ 702      
Interest rate 6.28%      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Multi-family, Midwest, Floating        
Investments in loans        
Number of loans | Item 4      
Carrying amount $ 76,252      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Multi-family, Midwest, Floating | LIBOR | Minimum        
Investments in loans        
Basis spread on variable rate 2.75%      
Aggregated First Mortgages | Multi-family, Midwest, Floating | LIBOR | Maximum        
Investments in loans        
Basis spread on variable rate 9.75%      
Aggregated First Mortgages | Multi-family, North East, Floating, 25 Mortgages        
Investments in loans        
Number of loans | Item 25      
Carrying amount $ 664,074      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Multi-family, North East, Floating, 25 Mortgages | LIBOR | Minimum        
Investments in loans        
Basis spread on variable rate 2.50%      
Aggregated First Mortgages | Multi-family, North East, Floating, 25 Mortgages | LIBOR | Maximum        
Investments in loans        
Basis spread on variable rate 10.75%      
Aggregated First Mortgages | Multi-family, North East, Floating, 1 Mortgage        
Investments in loans        
Number of loans | Item 1      
Carrying amount $ 73,682      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Multi-family, North East, Floating, 1 Mortgage | SOFR        
Investments in loans        
Basis spread on variable rate 3.00%      
Aggregated First Mortgages | Multi-family, South East, Floating, 15 Mortgages        
Investments in loans        
Number of loans | Item 15      
Carrying amount $ 372,761      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Multi-family, South East, Floating, 15 Mortgages | LIBOR | Minimum        
Investments in loans        
Basis spread on variable rate 2.70%      
Aggregated First Mortgages | Multi-family, South East, Floating, 15 Mortgages | LIBOR | Maximum        
Investments in loans        
Basis spread on variable rate 10.75%      
Aggregated First Mortgages | Multi-family, South East, Floating, 5 Mortgages        
Investments in loans        
Number of loans | Item 5      
Carrying amount $ 273,353      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Multi-family, South East, Floating, 5 Mortgages | SOFR | Minimum        
Investments in loans        
Basis spread on variable rate 2.75%      
Aggregated First Mortgages | Multi-family, South East, Floating, 5 Mortgages | SOFR | Maximum        
Investments in loans        
Basis spread on variable rate 3.30%      
Aggregated First Mortgages | Multi-family, South West, Floating, 21 Mortgages        
Investments in loans        
Number of loans | Item 21      
Carrying amount $ 531,238      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Multi-family, South West, Floating, 21 Mortgages | LIBOR | Minimum        
Investments in loans        
Basis spread on variable rate 2.50%      
Aggregated First Mortgages | Multi-family, South West, Floating, 21 Mortgages | LIBOR | Maximum        
Investments in loans        
Basis spread on variable rate 4.25%      
Aggregated First Mortgages | Multi-family, South West, Floating, 2 Mortgages        
Investments in loans        
Number of loans | Item 2      
Carrying amount $ 88,261      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Multi-family, South West, Floating, 2 Mortgages | SOFR | Minimum        
Investments in loans        
Basis spread on variable rate 1.75%      
Aggregated First Mortgages | Multi-family, South West, Floating, 2 Mortgages | SOFR | Maximum        
Investments in loans        
Basis spread on variable rate 7.25%      
Aggregated First Mortgages | Multi-family, West, Floating, 17 Mortgages        
Investments in loans        
Number of loans | Item 17      
Carrying amount $ 511,624      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Multi-family, West, Floating, 17 Mortgages | LIBOR | Minimum        
Investments in loans        
Basis spread on variable rate 2.50%      
Aggregated First Mortgages | Multi-family, West, Floating, 17 Mortgages | LIBOR | Maximum        
Investments in loans        
Basis spread on variable rate 9.00%      
Aggregated First Mortgages | Multi-family, West, Floating, 1 Mortgage        
Investments in loans        
Number of loans | Item 1      
Carrying amount $ 57,384      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Multi-family, West, Floating, 1 Mortgage | SOFR        
Investments in loans        
Basis spread on variable rate 3.25%      
Aggregated First Mortgages | Office, International, Floating, 2 Mortgages, 2024 Maturity        
Investments in loans        
Number of loans | Item 2      
Carrying amount $ 55,679      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Office, International, Floating, 2 Mortgages, 2024 Maturity | Three Month EURIBOR        
Investments in loans        
Basis spread on variable rate 7.50%      
Aggregated First Mortgages | Office, International, Floating, 4 Mortgages        
Investments in loans        
Number of loans | Item 4      
Carrying amount $ 426,769      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Office, International, Floating, 4 Mortgages | Three Month GBP | Minimum        
Investments in loans        
Basis spread on variable rate 3.50%      
Aggregated First Mortgages | Office, International, Floating, 4 Mortgages | Three Month GBP | Maximum        
Investments in loans        
Basis spread on variable rate 4.25%      
Aggregated First Mortgages | Office, International, Floating, 2 Mortgages, 2025 Maturity        
Investments in loans        
Number of loans | Item 2      
Carrying amount $ 79,746      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Office, International, Floating, 2 Mortgages, 2025 Maturity | Three Month GBP SONIA        
Investments in loans        
Basis spread on variable rate 3.25%      
Aggregated First Mortgages | Office, International, Floating, 2022 Maturity        
Investments in loans        
Number of loans | Item 2      
Carrying amount $ 98,813      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Office, International, Floating, 2022 Maturity | EURIBOR | Minimum        
Investments in loans        
Basis spread on variable rate 6.00%      
Aggregated First Mortgages | Office, International, Floating, 2022 Maturity | EURIBOR | Maximum        
Investments in loans        
Basis spread on variable rate 7.80%      
Aggregated First Mortgages | Office, Mid Atlantic, Floating, 46 Mortgages        
Investments in loans        
Number of loans | Item 46      
Carrying amount $ 797,022      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Office, Mid Atlantic, Floating, 46 Mortgages | LIBOR | Minimum        
Investments in loans        
Basis spread on variable rate 1.75%      
Aggregated First Mortgages | Office, Mid Atlantic, Floating, 46 Mortgages | LIBOR | Maximum        
Investments in loans        
Basis spread on variable rate 7.50%      
Aggregated First Mortgages | Office, Mid Atlantic, Floating, 1 Mortgage        
Investments in loans        
Number of loans | Item 1      
Carrying amount $ 59,789      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Office, Mid Atlantic, Floating, 1 Mortgage | SOFR        
Investments in loans        
Basis spread on variable rate 3.75%      
Aggregated First Mortgages | Office, Midwest, Floating        
Investments in loans        
Number of loans | Item 14      
Carrying amount $ 139,529      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Office, Midwest, Floating | LIBOR | Minimum        
Investments in loans        
Basis spread on variable rate 1.75%      
Aggregated First Mortgages | Office, Midwest, Floating | LIBOR | Maximum        
Investments in loans        
Basis spread on variable rate 9.75%      
Aggregated First Mortgages | Office, North East, Floating, 24 Mortgages        
Investments in loans        
Number of loans | Item 24      
Carrying amount $ 836,083      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Office, North East, Floating, 24 Mortgages | LIBOR | Minimum        
Investments in loans        
Basis spread on variable rate 2.60%      
Aggregated First Mortgages | Office, North East, Floating, 24 Mortgages | LIBOR | Maximum        
Investments in loans        
Basis spread on variable rate 10.25%      
Aggregated First Mortgages | Office, North East, Floating, 2 Mortgages        
Investments in loans        
Number of loans | Item 2      
Carrying amount $ 52,774      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Office, North East, Floating, 2 Mortgages | SOFR | Minimum        
Investments in loans        
Basis spread on variable rate 2.75%      
Aggregated First Mortgages | Office, North East, Floating, 2 Mortgages | SOFR | Maximum        
Investments in loans        
Basis spread on variable rate 8.50%      
Aggregated First Mortgages | Office, South East, Fixed        
Investments in loans        
Number of loans | Item 2      
Carrying amount $ 50,713      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Office, South East, Fixed | Minimum        
Investments in loans        
Interest rate 5.00%      
Aggregated First Mortgages | Office, South East, Fixed | Maximum        
Investments in loans        
Interest rate 12.00%      
Aggregated First Mortgages | Office, South East, Floating        
Investments in loans        
Number of loans | Item 8      
Carrying amount $ 317,524      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Office, South East, Floating | LIBOR | Minimum        
Investments in loans        
Basis spread on variable rate 1.65%      
Aggregated First Mortgages | Office, South East, Floating | LIBOR | Maximum        
Investments in loans        
Basis spread on variable rate 10.40%      
Aggregated First Mortgages | Office, South West, Floating        
Investments in loans        
Number of loans | Item 17      
Carrying amount $ 491,284      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Office, South West, Floating | LIBOR | Minimum        
Investments in loans        
Basis spread on variable rate 2.00%      
Aggregated First Mortgages | Office, South West, Floating | LIBOR | Maximum        
Investments in loans        
Basis spread on variable rate 8.55%      
Aggregated First Mortgages | Office, West, Floating        
Investments in loans        
Number of loans | Item 40      
Carrying amount $ 604,282      
Principal Amount of Delinquent Loans $ 219,754      
Aggregated First Mortgages | Office, West, Floating | LIBOR | Minimum        
Investments in loans        
Basis spread on variable rate 1.75%      
Aggregated First Mortgages | Office, West, Floating | LIBOR | Maximum        
Investments in loans        
Basis spread on variable rate 6.85%      
Aggregated First Mortgages | Other, International, Floating        
Investments in loans        
Number of loans | Item 1      
Carrying amount $ 335,877      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Other, International, Floating | Three Month GBP SONIA        
Investments in loans        
Basis spread on variable rate 4.35%      
Aggregated First Mortgages | Other, Midwest, Floating        
Investments in loans        
Number of loans | Item 4      
Carrying amount $ 59,900      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Other, Midwest, Floating | LIBOR | Minimum        
Investments in loans        
Basis spread on variable rate 4.50%      
Aggregated First Mortgages | Other, Midwest, Floating | LIBOR | Maximum        
Investments in loans        
Basis spread on variable rate 11.17%      
Aggregated First Mortgages | Other, North East, Fixed        
Investments in loans        
Number of loans | Item 1      
Carrying amount $ 9,200      
Interest rate 4.09%      
Principal Amount of Delinquent Loans $ 9,200      
Aggregated First Mortgages | Other, North East, Floating        
Investments in loans        
Number of loans | Item 11      
Carrying amount $ 258,810      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Other, North East, Floating | LIBOR | Minimum        
Investments in loans        
Basis spread on variable rate 3.40%      
Aggregated First Mortgages | Other, North East, Floating | LIBOR | Maximum        
Investments in loans        
Basis spread on variable rate 11.00%      
Aggregated First Mortgages | Other, Various, Fixed        
Investments in loans        
Number of loans | Item 1      
Carrying amount $ 39,665      
Interest rate 10.00%      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Other, West, Floating        
Investments in loans        
Number of loans | Item 4      
Carrying amount $ 32,179      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Other, West, Floating | LIBOR        
Investments in loans        
Basis spread on variable rate 7.00%      
Aggregated First Mortgages | Residential, North East, Floating        
Investments in loans        
Number of loans | Item 7      
Carrying amount $ 122,024      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Residential, North East, Floating | LIBOR | Minimum        
Investments in loans        
Basis spread on variable rate 4.25%      
Aggregated First Mortgages | Residential, North East, Floating | LIBOR | Maximum        
Investments in loans        
Basis spread on variable rate 8.60%      
Aggregated First Mortgages | Residential, Various, Fixed        
Investments in loans        
Number of loans | Item 116      
Carrying amount $ 59,225      
Principal Amount of Delinquent Loans $ 9,661      
Aggregated First Mortgages | Residential, Various, Fixed | Minimum        
Investments in loans        
Interest rate 3.38%      
Aggregated First Mortgages | Residential, Various, Fixed | Maximum        
Investments in loans        
Interest rate 8.25%      
Aggregated First Mortgages | Residential, South East, Floating        
Investments in loans        
Number of loans | Item 2      
Carrying amount $ 29,939      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Residential, South East, Floating | LIBOR | Minimum        
Investments in loans        
Basis spread on variable rate 4.75%      
Aggregated First Mortgages | Residential, South East, Floating | LIBOR | Maximum        
Investments in loans        
Basis spread on variable rate 10.54%      
Aggregated First Mortgages | Residential, West, Floating        
Investments in loans        
Number of loans | Item 5      
Carrying amount $ 73,982      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Residential, West, Floating | LIBOR | Minimum        
Investments in loans        
Basis spread on variable rate 2.75%      
Aggregated First Mortgages | Residential, West, Floating | LIBOR | Maximum        
Investments in loans        
Basis spread on variable rate 8.60%      
Aggregated First Mortgages | Retail, Midwest, Floating        
Investments in loans        
Number of loans | Item 4      
Carrying amount $ 41,056      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Retail, Midwest, Floating | LIBOR | Minimum        
Investments in loans        
Basis spread on variable rate 2.75%      
Aggregated First Mortgages | Retail, Midwest, Floating | LIBOR | Maximum        
Investments in loans        
Basis spread on variable rate 10.75%      
Aggregated First Mortgages | Retail, North East, Floating        
Investments in loans        
Number of loans | Item 1      
Carrying amount $ 199,090      
Principal Amount of Delinquent Loans $ 199,090      
Aggregated First Mortgages | Retail, North East, Floating | LIBOR | Minimum        
Investments in loans        
Basis spread on variable rate 7.25%      
Aggregated First Mortgages | Retail, North East, Floating | LIBOR | Maximum        
Investments in loans        
Basis spread on variable rate 13.50%      
Aggregated First Mortgages | Retail, South West, Floating        
Investments in loans        
Number of loans | Item 4      
Carrying amount $ 23,498      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Retail, South West, Floating | LIBOR | Minimum        
Investments in loans        
Basis spread on variable rate 2.25%      
Aggregated First Mortgages | Retail, South West, Floating | LIBOR | Maximum        
Investments in loans        
Basis spread on variable rate 15.25%      
Aggregated First Mortgages | Retail, West, Fixed        
Investments in loans        
Number of loans | Item 1      
Carrying amount $ 219      
Interest rate 7.26%      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Loans Held-for-Sale, Various, Fixed        
Investments in loans        
Carrying amount 2,876,800      
Principal Amount of Delinquent Loans $ 20,250      
Aggregated First Mortgages | Loans Held-for-Sale, Various, Fixed | Minimum        
Investments in loans        
Interest rate 2.64%      
Aggregated First Mortgages | Loans Held-for-Sale, Various, Fixed | Maximum        
Investments in loans        
Interest rate 9.15%      
Aggregated Subordinated and Mezzanine Loans        
Investments in loans        
Loan Loss Allowance $ (46,600)      
Prepaid Loan Costs, Net $ (5,636)      
Aggregated Subordinated and Mezzanine Loans | Hotel, South East, Floating        
Investments in loans        
Number of loans | Item 3      
Carrying amount $ 87,905      
Principal Amount of Delinquent Loans $ 0      
Aggregated Subordinated and Mezzanine Loans | Hotel, South East, Floating | LIBOR | Minimum        
Investments in loans        
Basis spread on variable rate 6.75%      
Aggregated Subordinated and Mezzanine Loans | Hotel, South East, Floating | LIBOR | Maximum        
Investments in loans        
Basis spread on variable rate 9.35%      
Aggregated Subordinated and Mezzanine Loans | Hotel, West, Floating        
Investments in loans        
Number of loans | Item 1      
Carrying amount $ 15,320      
Principal Amount of Delinquent Loans $ 0      
Aggregated Subordinated and Mezzanine Loans | Hotel, West, Floating | LIBOR        
Investments in loans        
Basis spread on variable rate 10.98%      
Aggregated Subordinated and Mezzanine Loans | Industrial, South East, Fixed        
Investments in loans        
Number of loans | Item 1      
Carrying amount $ 3,046      
Interest rate 8.18%      
Principal Amount of Delinquent Loans $ 0      
Aggregated Subordinated and Mezzanine Loans | Industrial, West, Floating        
Investments in loans        
Number of loans | Item 2      
Carrying amount $ 11,578      
Principal Amount of Delinquent Loans $ 0      
Aggregated Subordinated and Mezzanine Loans | Industrial, West, Floating | LIBOR        
Investments in loans        
Basis spread on variable rate 11.30%      
Aggregated Subordinated and Mezzanine Loans | Mixed Use, International, Floating, 1 Mortgage, 2022 Maturity        
Investments in loans        
Number of loans | Item 1      
Carrying amount $ 29,136      
Principal Amount of Delinquent Loans $ 0      
Aggregated Subordinated and Mezzanine Loans | Mixed Use, International, Floating, 1 Mortgage, 2022 Maturity | Three Month EURIBOR        
Investments in loans        
Basis spread on variable rate 7.25%      
Aggregated Subordinated and Mezzanine Loans | Mixed Use, South West, Floating        
Investments in loans        
Number of loans | Item 1      
Carrying amount $ 108,970      
Principal Amount of Delinquent Loans $ 0      
Aggregated Subordinated and Mezzanine Loans | Mixed Use, South West, Floating | LIBOR        
Investments in loans        
Basis spread on variable rate 11.85%      
Aggregated Subordinated and Mezzanine Loans | Other, International, Floating        
Investments in loans        
Number of loans | Item 5      
Carrying amount $ 48,486      
Principal Amount of Delinquent Loans $ 0      
Aggregated Subordinated and Mezzanine Loans | Other, International, Floating | Three Month EURIBOR | Minimum        
Investments in loans        
Basis spread on variable rate 7.00%      
Aggregated Subordinated and Mezzanine Loans | Other, International, Floating | Three Month EURIBOR | Maximum        
Investments in loans        
Basis spread on variable rate 8.95%      
Aggregated Subordinated and Mezzanine Loans | Other, North East, Fixed        
Investments in loans        
Number of loans | Item 2      
Carrying amount $ 35,637      
Interest rate 8.72%      
Principal Amount of Delinquent Loans $ 0      
Aggregated Subordinated and Mezzanine Loans | Other, West, Floating        
Investments in loans        
Number of loans | Item 4      
Carrying amount $ 101,263      
Principal Amount of Delinquent Loans $ 0      
Aggregated Subordinated and Mezzanine Loans | Other, West, Floating | LIBOR | Minimum        
Investments in loans        
Basis spread on variable rate 6.24%      
Aggregated Subordinated and Mezzanine Loans | Other, West, Floating | LIBOR | Maximum        
Investments in loans        
Basis spread on variable rate 6.67%      
Aggregated Subordinated and Mezzanine Loans | Multi-family, North East, Floating, 2023 Maturity        
Investments in loans        
Number of loans | Item 1      
Carrying amount $ 29,079      
Principal Amount of Delinquent Loans $ 0      
Aggregated Subordinated and Mezzanine Loans | Multi-family, North East, Floating, 2023 Maturity | LIBOR        
Investments in loans        
Basis spread on variable rate 4.50%      
Aggregated Subordinated and Mezzanine Loans | Multi-family, North East, Floating, 2025 Maturity        
Investments in loans        
Number of loans | Item 1      
Carrying amount $ 13,433      
Principal Amount of Delinquent Loans $ 0      
Aggregated Subordinated and Mezzanine Loans | Multi-family, North East, Floating, 2025 Maturity | SOFR        
Investments in loans        
Basis spread on variable rate 13.75%      
Aggregated Subordinated and Mezzanine Loans | Retail, Midwest, Fixed        
Investments in loans        
Number of loans | Item 1      
Carrying amount $ 4,925      
Interest rate 7.16%      
Principal Amount of Delinquent Loans $ 4,925