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Schedule IV - Mortgage Loans on Real Estate - Summary of Loans (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2025
USD ($)
mortgage
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Investments in loans        
Carrying Amount $ 21,186,255 $ 17,953,021 $ 20,219,886 $ 21,186,033
Basis spread on variable rate 3.40%      
Principal Amount of Delinquent Loans $ 798,291      
Federal income tax basis 18,900,000      
Commercial and Residential Lending Segment and Investing and Servicing Segment        
Investments in loans        
Carrying Amount $ 18,310,621 $ 15,364,817 $ 17,653,215 $ 18,774,708
Individually Significant Mortgage Loans | Other, Various, Australia (1 mortgage)        
Investments in loans        
Number of loans | mortgage 1      
Face Amount $ 918,734      
Carrying Amount 911,541      
Principal Amount of Delinquent Loans $ 0      
Individually Significant Mortgage Loans | Other, Various, Australia (1 mortgage) | Three Month BBSY        
Investments in loans        
Basis spread on variable rate 4.75%      
Aggregated First Mortgages | Hotel, International, Floating (2 mortgages)        
Investments in loans        
Number of loans | mortgage 2      
Carrying Amount $ 215,187      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Hotel, International, Floating (2 mortgages) | Three Month EURO LIBOR | Minimum        
Investments in loans        
Basis spread on variable rate 3.05%      
Aggregated First Mortgages | Hotel, International, Floating (2 mortgages) | Three Month EURO LIBOR | Maximum        
Investments in loans        
Basis spread on variable rate 4.50%      
Aggregated First Mortgages | Hotel, International, Floating, (1 mortgages), SARON        
Investments in loans        
Number of loans | mortgage 1      
Carrying Amount $ 53,661      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Hotel, International, Floating, (1 mortgages), SARON | SARON        
Investments in loans        
Basis spread on variable rate 4.75%      
Aggregated First Mortgages | Hotel, International, Floating, (1 mortgages), SOFR        
Investments in loans        
Number of loans | mortgage 1      
Carrying Amount $ 84,954      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Hotel, International, Floating, (1 mortgages), SOFR | SOFR        
Investments in loans        
Basis spread on variable rate 5.00%      
Aggregated First Mortgages | Hotel, International, Floating, (1 mortgages), SONIA ON        
Investments in loans        
Number of loans | mortgage 1      
Carrying Amount $ 34,002      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Hotel, International, Floating, (1 mortgages), SONIA ON | SONIA        
Investments in loans        
Basis spread on variable rate 2.50%      
Aggregated First Mortgages | Hotel, Mid Atlantic, Floating, (1 mortgages)        
Investments in loans        
Number of loans | mortgage 1      
Carrying Amount $ 84,400      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Hotel, Mid Atlantic, Floating, (1 mortgages) | SOFR        
Investments in loans        
Basis spread on variable rate 3.30%      
Aggregated First Mortgages | Hotel, Midwest, Floating, (1 mortgages)        
Investments in loans        
Number of loans | mortgage 1      
Carrying Amount $ 53,482      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Hotel, Midwest, Floating, (1 mortgages) | SOFR        
Investments in loans        
Basis spread on variable rate 3.85%      
Aggregated First Mortgages | Hotel, North East, Floating, (5 mortgages)        
Investments in loans        
Number of loans | mortgage 5      
Carrying Amount $ 338,180      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Hotel, North East, Floating, (5 mortgages) | SOFR | Minimum        
Investments in loans        
Basis spread on variable rate 3.36%      
Aggregated First Mortgages | Hotel, North East, Floating, (5 mortgages) | SOFR | Maximum        
Investments in loans        
Basis spread on variable rate 6.35%      
Aggregated First Mortgages | Hotel, South East, Floating, (2 mortgages)        
Investments in loans        
Number of loans | mortgage 2      
Carrying Amount $ 133,290      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Hotel, South East, Floating, (2 mortgages) | SOFR | Minimum        
Investments in loans        
Basis spread on variable rate 3.25%      
Aggregated First Mortgages | Hotel, South East, Floating, (2 mortgages) | SOFR | Maximum        
Investments in loans        
Basis spread on variable rate 5.25%      
Aggregated First Mortgages | Hotel, South West, Floating, (1 mortgages)        
Investments in loans        
Number of loans | mortgage 1      
Carrying Amount $ 97,487      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Hotel, South West, Floating, (1 mortgages) | SOFR        
Investments in loans        
Basis spread on variable rate 2.85%      
Aggregated First Mortgages | Hotel, Various U.S., Floating, (2 mortgages)        
Investments in loans        
Number of loans | mortgage 2      
Carrying Amount $ 251,252      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Hotel, Various U.S., Floating, (2 mortgages) | SOFR | Minimum        
Investments in loans        
Basis spread on variable rate 3.86%      
Aggregated First Mortgages | Hotel, Various U.S., Floating, (2 mortgages) | SOFR | Maximum        
Investments in loans        
Basis spread on variable rate 4.25%      
Aggregated First Mortgages | Industrial, International, Floating, (2 mortgages), 3BBSY        
Investments in loans        
Number of loans | mortgage 2      
Carrying Amount $ 165,343      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Industrial, International, Floating, (2 mortgages), 3BBSY | Three Month BBSY | Minimum        
Investments in loans        
Basis spread on variable rate 2.80%      
Aggregated First Mortgages | Industrial, International, Floating, (2 mortgages), 3BBSY | Three Month BBSY | Maximum        
Investments in loans        
Basis spread on variable rate 3.10%      
Aggregated First Mortgages | Industrial, International, Floating (3 mortgages)        
Investments in loans        
Number of loans | mortgage 3      
Carrying Amount $ 440,174      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Industrial, International, Floating (3 mortgages) | Three Month EURO LIBOR | Minimum        
Investments in loans        
Basis spread on variable rate 2.50%      
Aggregated First Mortgages | Industrial, International, Floating (3 mortgages) | Three Month EURO LIBOR | Maximum        
Investments in loans        
Basis spread on variable rate 3.00%      
Aggregated First Mortgages | Industrial, International, Floating, (2 mortgages), 3SEK        
Investments in loans        
Number of loans | mortgage 2      
Carrying Amount $ 136,258      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Industrial, International, Floating, (2 mortgages), 3SEK | Three Month SEK | Minimum        
Investments in loans        
Basis spread on variable rate 2.55%      
Aggregated First Mortgages | Industrial, International, Floating, (2 mortgages), 3SEK | Three Month SEK | Maximum        
Investments in loans        
Basis spread on variable rate 3.00%      
Aggregated First Mortgages | Industrial, International, Floating, (1 mortgage)        
Investments in loans        
Number of loans | mortgage 1      
Carrying Amount $ 268,621      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Industrial, International, Floating, (1 mortgage) | Three Month EURO LIBOR        
Investments in loans        
Basis spread on variable rate 2.60%      
Aggregated First Mortgages | Industrial, International, Floating, (1 mortgage) | SONIA        
Investments in loans        
Basis spread on variable rate 2.60%      
Aggregated First Mortgages | Industrial, Mid Atlantic, Floating, (3 mortgages)        
Investments in loans        
Number of loans | mortgage 3      
Carrying Amount $ 334,942      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Industrial, Mid Atlantic, Floating, (3 mortgages) | SOFR | Minimum        
Investments in loans        
Basis spread on variable rate 2.40%      
Aggregated First Mortgages | Industrial, Mid Atlantic, Floating, (3 mortgages) | SOFR | Maximum        
Investments in loans        
Basis spread on variable rate 3.00%      
Aggregated First Mortgages | Industrial, Midwest, Floating, (1 mortgage)        
Investments in loans        
Number of loans | mortgage 1      
Carrying Amount $ 8,712      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Industrial, Midwest, Floating, (1 mortgage) | SOFR        
Investments in loans        
Interest rate 2.25%      
Aggregated First Mortgages | Industrial, North East, Floating, (5 mortgages)        
Investments in loans        
Number of loans | mortgage 5      
Carrying Amount $ 1,009,135      
Principal Amount of Delinquent Loans $ 269,007      
Aggregated First Mortgages | Industrial, North East, Floating, (5 mortgages) | SOFR | Minimum        
Investments in loans        
Basis spread on variable rate 2.40%      
Aggregated First Mortgages | Industrial, North East, Floating, (5 mortgages) | SOFR | Maximum        
Investments in loans        
Basis spread on variable rate 5.55%      
Aggregated First Mortgages | Industrial, South East, Floating, (1 mortgage)        
Investments in loans        
Number of loans | mortgage 1      
Carrying Amount $ 20,163      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Industrial, South East, Floating, (1 mortgage) | SOFR | Maximum        
Investments in loans        
Basis spread on variable rate 4.85%      
Aggregated First Mortgages | Industrial, South West, Floating, (1 mortgage)        
Investments in loans        
Number of loans | mortgage 1      
Carrying Amount $ 20,589      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Industrial, South West, Floating, (1 mortgage) | SOFR | Maximum        
Investments in loans        
Basis spread on variable rate 2.25%      
Aggregated First Mortgages | Industrial, West, Floating, (4 mortgages)        
Investments in loans        
Number of loans | mortgage 4      
Carrying Amount $ 611,575      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Industrial, West, Floating, (4 mortgages) | SOFR | Minimum        
Investments in loans        
Basis spread on variable rate 2.95%      
Aggregated First Mortgages | Industrial, West, Floating, (4 mortgages) | SOFR | Maximum        
Investments in loans        
Basis spread on variable rate 6.00%      
Aggregated First Mortgages | Mixed Use, International, Floating, (1 mortgage), 3EUR        
Investments in loans        
Number of loans | mortgage 1      
Carrying Amount $ 88,301      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Mixed Use, International, Floating, (1 mortgage), 3EUR | Three Month EURO LIBOR        
Investments in loans        
Basis spread on variable rate 4.65%      
Aggregated First Mortgages | Mixed Use, International, Floating, (1 mortgage), SONIA ON        
Investments in loans        
Number of loans | mortgage 1      
Carrying Amount $ 90,174      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Mixed Use, International, Floating, (1 mortgage), SONIA ON | SONIA | Maximum        
Investments in loans        
Basis spread on variable rate 4.37%      
Aggregated First Mortgages | Mixed Use, North East, Floating, (1 mortgage)        
Investments in loans        
Number of loans | mortgage 1      
Carrying Amount $ 159,439      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Mixed Use, North East, Floating, (1 mortgage) | SOFR | Maximum        
Investments in loans        
Basis spread on variable rate 3.35%      
Aggregated First Mortgages | Mixed Use, South East, Floating, (2 mortgages)        
Investments in loans        
Number of loans | mortgage 2      
Carrying Amount $ 179,496      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Mixed Use, South East, Floating, (2 mortgages) | SOFR | Minimum        
Investments in loans        
Basis spread on variable rate 3.65%      
Aggregated First Mortgages | Mixed Use, South East, Floating, (2 mortgages) | SOFR | Maximum        
Investments in loans        
Basis spread on variable rate 5.35%      
Aggregated First Mortgages | Mixed Use, South West, Floating, (1 mortgage)        
Investments in loans        
Number of loans | mortgage 1      
Carrying Amount $ 242,389      
Principal Amount of Delinquent Loans $ 242,389      
Aggregated First Mortgages | Mixed Use, South West, Floating, (1 mortgage) | SOFR | Maximum        
Investments in loans        
Basis spread on variable rate 4.60%      
Aggregated First Mortgages | Multi-family, International, Floating, (1 mortgage)        
Investments in loans        
Number of loans | mortgage 1      
Carrying Amount $ 188,029      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Multi-family, International, Floating, (1 mortgage) | Three Month EURO LIBOR | Maximum        
Investments in loans        
Basis spread on variable rate 2.85%      
Aggregated First Mortgages | Multi-family, International, Floating, (4 mortgages)        
Investments in loans        
Number of loans | mortgage 4      
Carrying Amount $ 750,644      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Multi-family, International, Floating, (4 mortgages) | SONIA | Minimum        
Investments in loans        
Basis spread on variable rate 3.10%      
Aggregated First Mortgages | Multi-family, International, Floating, (4 mortgages) | SONIA | Maximum        
Investments in loans        
Basis spread on variable rate 4.00%      
Aggregated First Mortgages | Multi-family, Midwest, Floating, (3 mortgages)        
Investments in loans        
Number of loans | mortgage 3      
Carrying Amount $ 174,622      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Multi-family, Midwest, Floating, (3 mortgages) | SOFR | Minimum        
Investments in loans        
Basis spread on variable rate 2.40%      
Aggregated First Mortgages | Multi-family, Midwest, Floating, (3 mortgages) | SOFR | Maximum        
Investments in loans        
Basis spread on variable rate 2.75%      
Aggregated First Mortgages | Multi-family, North East, Floating, (7 mortgages)        
Investments in loans        
Number of loans | mortgage 7      
Carrying Amount $ 679,267      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Multi-family, North East, Floating, (7 mortgages) | SOFR | Minimum        
Investments in loans        
Basis spread on variable rate 2.50%      
Aggregated First Mortgages | Multi-family, North East, Floating, (7 mortgages) | SOFR | Maximum        
Investments in loans        
Basis spread on variable rate 3.50%      
Aggregated First Mortgages | Multi-family, South East, Floating, (18 mortgages)        
Investments in loans        
Number of loans | mortgage 18      
Carrying Amount $ 1,230,635      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Multi-family, South East, Floating, (18 mortgages) | Minimum        
Investments in loans        
Basis spread on variable rate 1.80%      
Aggregated First Mortgages | Multi-family, South East, Floating, (18 mortgages) | Maximum        
Investments in loans        
Basis spread on variable rate 4.13%      
Aggregated First Mortgages | Multi-family, South West, Floating, (27 mortgages)        
Investments in loans        
Number of loans | mortgage 27      
Carrying Amount $ 1,720,037      
Principal Amount of Delinquent Loans $ 90,859      
Aggregated First Mortgages | Multi-family, South West, Floating, (27 mortgages) | SOFR | Minimum        
Investments in loans        
Basis spread on variable rate 1.85%      
Aggregated First Mortgages | Multi-family, South West, Floating, (27 mortgages) | SOFR | Maximum        
Investments in loans        
Basis spread on variable rate 4.35%      
Aggregated First Mortgages | Multi-family, Various U.S., Floating, (1 mortgage)        
Investments in loans        
Number of loans | mortgage 1      
Carrying Amount $ 544,956      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Multi-family, Various U.S., Floating, (1 mortgage) | SOFR        
Investments in loans        
Basis spread on variable rate 2.70%      
Aggregated First Mortgages | Multi-family, West, Floating (10 mortgages)        
Investments in loans        
Number of loans | mortgage 10      
Carrying Amount $ 837,354      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Multi-family, West, Floating (10 mortgages) | SOFR | Minimum        
Investments in loans        
Basis spread on variable rate 1.95%      
Aggregated First Mortgages | Multi-family, West, Floating (10 mortgages) | SOFR | Maximum        
Investments in loans        
Basis spread on variable rate 3.85%      
Aggregated First Mortgages | Office, International, Floating, (2 mortgages), 3EUR        
Investments in loans        
Number of loans | mortgage 2      
Carrying Amount $ 252,940      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Office, International, Floating, (2 mortgages), 3EUR | Three Month EURO LIBOR | Minimum        
Investments in loans        
Basis spread on variable rate 2.74%      
Aggregated First Mortgages | Office, International, Floating, (2 mortgages), 3EUR | Three Month EURO LIBOR | Maximum        
Investments in loans        
Basis spread on variable rate 3.75%      
Aggregated First Mortgages | Office, International, Floating, (2 mortgages), SONIA ON        
Investments in loans        
Number of loans | mortgage 2      
Carrying Amount $ 318,972      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Office, International, Floating, (2 mortgages), SONIA ON | SONIA | Minimum        
Investments in loans        
Basis spread on variable rate 3.55%      
Aggregated First Mortgages | Office, International, Floating, (2 mortgages), SONIA ON | SONIA | Maximum        
Investments in loans        
Basis spread on variable rate 3.75%      
Aggregated First Mortgages | Office, Mid Atlantic, Floating, (1 mortgage)        
Investments in loans        
Number of loans | mortgage 1      
Carrying Amount $ 117,067      
Principal Amount of Delinquent Loans $ 117,141      
Aggregated First Mortgages | Office, Mid Atlantic, Floating, (1 mortgage) | Prime Rate        
Investments in loans        
Basis spread on variable rate 0.19%      
Aggregated First Mortgages | Office, Mid Atlantic, Floating, (2 mortgages)        
Investments in loans        
Number of loans | mortgage 2      
Carrying Amount $ 505,571      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Office, Mid Atlantic, Floating, (2 mortgages) | SOFR | Minimum        
Investments in loans        
Basis spread on variable rate 1.00%      
Aggregated First Mortgages | Office, Mid Atlantic, Floating, (2 mortgages) | SOFR | Maximum        
Investments in loans        
Basis spread on variable rate 2.25%      
Aggregated First Mortgages | Office, Midwest, Floating, (2 mortgages)        
Investments in loans        
Number of loans | mortgage 2      
Carrying Amount $ 146,798      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Office, Midwest, Floating, (2 mortgages) | SOFR | Minimum        
Investments in loans        
Interest rate 1.00%      
Aggregated First Mortgages | Office, Midwest, Floating, (2 mortgages) | SOFR | Maximum        
Investments in loans        
Interest rate 2.45%      
Aggregated First Mortgages | Office, North East, Fixed, (1 mortgage)        
Investments in loans        
Number of loans | mortgage 1      
Carrying Amount $ 96,095      
Basis spread on variable rate 6.00%      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Office, North East, Floating, (3 mortgages)        
Investments in loans        
Number of loans | mortgage 3      
Carrying Amount $ 216,355      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Office, North East, Floating, (3 mortgages) | SOFR | Minimum        
Investments in loans        
Interest rate 2.45%      
Aggregated First Mortgages | Office, North East, Floating, (3 mortgages) | SOFR | Maximum        
Investments in loans        
Interest rate 4.00%      
Aggregated First Mortgages | Office, South East, Floating, (2 mortgages)        
Investments in loans        
Number of loans | mortgage 2      
Carrying Amount $ 270,231      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Office, South East, Floating, (2 mortgages) | SOFR | Minimum        
Investments in loans        
Basis spread on variable rate 1.00%      
Aggregated First Mortgages | Office, South East, Floating, (2 mortgages) | SOFR | Maximum        
Investments in loans        
Basis spread on variable rate 3.10%      
Aggregated First Mortgages | Office, South West, Floating, (3 mortgages)        
Investments in loans        
Number of loans | mortgage 3      
Carrying Amount $ 541,434      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Office, South West, Floating, (3 mortgages) | SOFR | Minimum        
Investments in loans        
Basis spread on variable rate 3.30%      
Aggregated First Mortgages | Office, South West, Floating, (3 mortgages) | SOFR | Maximum        
Investments in loans        
Basis spread on variable rate 4.50%      
Aggregated First Mortgages | Office, West, Floating, (2 mortgages)        
Investments in loans        
Number of loans | mortgage 2      
Carrying Amount $ 286,220      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Office, West, Floating, (2 mortgages) | SOFR | Minimum        
Investments in loans        
Basis spread on variable rate 0.00%      
Aggregated First Mortgages | Office, West, Floating, (2 mortgages) | SOFR | Maximum        
Investments in loans        
Basis spread on variable rate 2.80%      
Aggregated First Mortgages | Other, International, Floating, (1 mortgage)        
Investments in loans        
Number of loans | mortgage 1      
Carrying Amount $ 305,752      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Other, International, Floating, (1 mortgage) | SONIA        
Investments in loans        
Basis spread on variable rate 5.01%      
Aggregated First Mortgages | Other, Midwest, Floating, (1 mortgage)        
Investments in loans        
Number of loans | mortgage 1      
Carrying Amount $ 29,799      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Other, Midwest, Floating, (1 mortgage) | SOFR        
Investments in loans        
Basis spread on variable rate 7.50%      
Aggregated First Mortgages | Other, North East, Floating, (2 mortgages)        
Investments in loans        
Number of loans | mortgage 2      
Carrying Amount $ 203,345      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Other, North East, Floating, (2 mortgages) | SOFR | Minimum        
Investments in loans        
Basis spread on variable rate 1.57%      
Aggregated First Mortgages | Other, North East, Floating, (2 mortgages) | SOFR | Maximum        
Investments in loans        
Basis spread on variable rate 2.75%      
Aggregated First Mortgages | Other, South West, Fixed, (1 mortgage)        
Investments in loans        
Number of loans | mortgage 1      
Carrying Amount $ 20,000      
Basis spread on variable rate 7.00%      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Residential, International, Floating, (1 mortgage)        
Investments in loans        
Number of loans | mortgage 1      
Carrying Amount $ 8,893      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Residential, International, Floating, (1 mortgage) | SONIA        
Investments in loans        
Basis spread on variable rate 3.10%      
Aggregated First Mortgages | Residential, North East, Floating, (2 mortgages)        
Investments in loans        
Number of loans | mortgage 2      
Carrying Amount $ 93,334      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Residential, North East, Floating, (2 mortgages) | SOFR | Minimum        
Investments in loans        
Basis spread on variable rate 4.00%      
Aggregated First Mortgages | Residential, North East, Floating, (2 mortgages) | SOFR | Maximum        
Investments in loans        
Basis spread on variable rate 4.25%      
Aggregated First Mortgages | Residential, South East, Floating, (2 mortgages)        
Investments in loans        
Number of loans | mortgage 2      
Carrying Amount $ 202,785      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Residential, South East, Floating, (2 mortgages) | SOFR | Minimum        
Investments in loans        
Basis spread on variable rate 4.25%      
Aggregated First Mortgages | Residential, South East, Floating, (2 mortgages) | SOFR | Maximum        
Investments in loans        
Basis spread on variable rate 5.80%      
Aggregated First Mortgages | Retail, International, Floating, (1 mortgage )        
Investments in loans        
Number of loans | mortgage 1      
Carrying Amount $ 117,121      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Retail, International, Floating, (1 mortgage ) | Three Month EURO LIBOR        
Investments in loans        
Basis spread on variable rate 3.00%      
Aggregated First Mortgages | Retail, North East, Floating, (1 mortgage)        
Investments in loans        
Number of loans | mortgage 1      
Carrying Amount $ 188,212      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Retail, North East, Floating, (1 mortgage) | SOFR        
Investments in loans        
Basis spread on variable rate 12.00%      
Aggregated First Mortgages | Loans Held-for-Sale, Various, Fixed        
Investments in loans        
Carrying Amount $ 2,323,543      
Principal Amount of Delinquent Loans $ 73,970      
Aggregated First Mortgages | Loans Held-for-Sale, Various, Fixed | Minimum        
Investments in loans        
Interest rate 2.75%      
Aggregated First Mortgages | Loans Held-for-Sale, Various, Fixed | Maximum        
Investments in loans        
Interest rate 10.75%      
Aggregated Subordinated and Mezzanine Loans        
Investments in loans        
Loan Loss Allowance $ (426,365)      
Prepaid Loan Costs, Net $ 7,369      
Aggregated Subordinated and Mezzanine Loans | Hotel, West, Floating, (1 loan)        
Investments in loans        
Number of loans | mortgage 1      
Carrying Amount $ 22,406      
Principal Amount of Delinquent Loans $ 0      
Aggregated Subordinated and Mezzanine Loans | Hotel, West, Floating, (1 loan) | SOFR        
Investments in loans        
Basis spread on variable rate 6.50%      
Aggregated Subordinated and Mezzanine Loans | Multi-family, North East, Floating, (1 loan)        
Investments in loans        
Number of loans | mortgage 1      
Carrying Amount $ 5,792      
Principal Amount of Delinquent Loans $ 0      
Aggregated Subordinated and Mezzanine Loans | Multi-family, North East, Floating, (1 loan) | SOFR        
Investments in loans        
Basis spread on variable rate 3.35%      
Aggregated Subordinated and Mezzanine Loans | Office, International, Fixed, (1 loan)        
Investments in loans        
Number of loans | mortgage 1      
Carrying Amount $ 36,529      
Interest rate 0.00%      
Principal Amount of Delinquent Loans $ 0      
Aggregated Subordinated and Mezzanine Loans | Office, International, Floating, (1 Loans)        
Investments in loans        
Number of loans | mortgage 1      
Carrying Amount $ 10,758      
Principal Amount of Delinquent Loans $ 0      
Aggregated Subordinated and Mezzanine Loans | Office, International, Floating, (1 Loans) | Three Month EURO LIBOR        
Investments in loans        
Basis spread on variable rate 8.95%      
Aggregated Subordinated and Mezzanine Loans | Office, West, Floating, (1 loan)        
Investments in loans        
Number of loans | mortgage 1      
Carrying Amount $ 131,713      
Principal Amount of Delinquent Loans $ 0      
Aggregated Subordinated and Mezzanine Loans | Office, West, Floating, (1 loan) | SOFR        
Investments in loans        
Basis spread on variable rate 6.34%      
Aggregated Subordinated and Mezzanine Loans | Residential, North East, Floating, (2 Loans)        
Investments in loans        
Number of loans | mortgage 2      
Carrying Amount $ 66,162      
Principal Amount of Delinquent Loans $ 0      
Aggregated Subordinated and Mezzanine Loans | Residential, North East, Floating, (2 Loans) | SOFR | Minimum        
Investments in loans        
Basis spread on variable rate 7.75%      
Aggregated Subordinated and Mezzanine Loans | Residential, North East, Floating, (2 Loans) | SOFR | Maximum        
Investments in loans        
Basis spread on variable rate 9.00%      
Aggregated Subordinated and Mezzanine Loans | Residential, West, Fixed, (1 Loan)        
Investments in loans        
Number of loans | mortgage 1      
Carrying Amount $ 48,574      
Basis spread on variable rate 9.00%      
Principal Amount of Delinquent Loans $ 0      
Aggregated Subordinated and Mezzanine Loans | Retail, Midwest, Fixed, (1 Loan)        
Investments in loans        
Number of loans | mortgage 1      
Carrying Amount $ 4,925      
Basis spread on variable rate 7.16%      
Principal Amount of Delinquent Loans $ 4,925      
First Mortgage Loan | Hotel, Various U.S., Floating, (2 mortgages)        
Investments in loans        
Carrying Amount $ 102,600