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Schedule IV - Mortgage Loans on Real Estate - Summary of Loans (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
USD ($)
mortgage
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Investments in loans        
Carrying amount $ 20,219,886 $ 21,186,033 $ 18,413,649 $ 12,139,908
Basis spread on variable rate 4.00%      
Principal Amount of Delinquent Loans $ 494,886      
Federal income tax basis 18,000,000      
Commercial and Residential Lending Segment and Investing and Servicing Segment        
Investments in loans        
Carrying amount $ 17,653,215 $ 18,774,708 $ 16,368,799 $ 10,584,400
Individually Significant Mortgage Loans | Other, Various, Australia (1 mortgage)        
Investments in loans        
Number of loans | mortgage 1      
Face Amount $ 937,737      
Carrying amount 928,362      
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 $ 99,143      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Hotel, International, Floating (2 mortgages) | 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 | mortgage 4      
Carrying amount $ 74,513      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Hotel, International, Floating, (4 Mortgages) | SARON        
Investments in loans        
Basis spread on variable rate 4.75%      
Aggregated First Mortgages | Hotel, International, Floating (5 mortgages)        
Investments in loans        
Number of loans | mortgage 5      
Carrying amount $ 61,350      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Hotel, International, Floating (5 mortgages) | SOFR | Minimum        
Investments in loans        
Basis spread on variable rate 3.10%      
Aggregated First Mortgages | Hotel, International, Floating (5 mortgages) | SOFR | Maximum        
Investments in loans        
Basis spread on variable rate 9.10%      
Aggregated First Mortgages | Hotel, Mid Atlantic, Floating (5 mortgages)        
Investments in loans        
Number of loans | mortgage 5      
Carrying amount $ 106,245      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Hotel, Mid Atlantic, Floating (5 mortgages) | SOFR | Minimum        
Investments in loans        
Basis spread on variable rate 2.10%      
Aggregated First Mortgages | Hotel, Mid Atlantic, Floating (5 mortgages) | SOFR | Maximum        
Investments in loans        
Basis spread on variable rate 6.90%      
Aggregated First Mortgages | Hotel, Midwest, Floating (4 mortgages)        
Investments in loans        
Number of loans | mortgage 4      
Carrying amount $ 53,415      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Hotel, Midwest, Floating (4 mortgages) | SOFR | Minimum        
Investments in loans        
Basis spread on variable rate 2.35%      
Aggregated First Mortgages | Hotel, Midwest, Floating (4 mortgages) | SOFR | Maximum        
Investments in loans        
Basis spread on variable rate 8.73%      
Aggregated First Mortgages | Hotel, North East, Floating (9 mortgages)        
Investments in loans        
Number of loans | mortgage 9      
Carrying amount $ 310,952      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Hotel, North East, Floating (9 mortgages) | SOFR | Minimum        
Investments in loans        
Basis spread on variable rate 2.50%      
Aggregated First Mortgages | Hotel, North East, Floating (9 mortgages) | SOFR | Maximum        
Investments in loans        
Basis spread on variable rate 10.10%      
Aggregated First Mortgages | Hotel, South East, Floating (20 mortgages)        
Investments in loans        
Number of loans | mortgage 20      
Carrying amount $ 148,248      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Hotel, South East, Floating (20 mortgages) | SOFR | Minimum        
Investments in loans        
Basis spread on variable rate 2.50%      
Aggregated First Mortgages | Hotel, South East, Floating (20 mortgages) | SOFR | Maximum        
Investments in loans        
Basis spread on variable rate 13.37%      
Aggregated First Mortgages | Hotel, South West, Floating (8 mortgages)        
Investments in loans        
Number of loans | mortgage 8      
Carrying amount $ 97,486      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Hotel, South West, Floating (8 mortgages) | SOFR | Minimum        
Investments in loans        
Basis spread on variable rate 2.10%      
Aggregated First Mortgages | Hotel, South West, Floating (8 mortgages) | SOFR | Maximum        
Investments in loans        
Basis spread on variable rate 5.85%      
Aggregated First Mortgages | Hotel, Various, Floating (18 mortgages)        
Investments in loans        
Number of loans | mortgage 18      
Carrying amount $ 579,533      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Hotel, Various, Floating (18 mortgages) | SOFR | Minimum        
Investments in loans        
Basis spread on variable rate 3.86%      
Aggregated First Mortgages | Hotel, Various, Floating (18 mortgages) | SOFR | Maximum        
Investments in loans        
Basis spread on variable rate 10.25%      
Aggregated First Mortgages | Hotel, West, Floating (12 mortgages)        
Investments in loans        
Number of loans | mortgage 12      
Carrying amount $ 86,464      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Hotel, West, Floating (12 mortgages) | SOFR | Minimum        
Investments in loans        
Basis spread on variable rate 2.60%      
Aggregated First Mortgages | Hotel, West, Floating (12 mortgages) | SOFR | Maximum        
Investments in loans        
Basis spread on variable rate 8.35%      
Aggregated First Mortgages | Hotel, West, Floating (2 mortgages)        
Investments in loans        
Number of loans | mortgage 2      
Carrying amount $ 37,763      
Principal Amount of Delinquent Loans $ 37,763      
Aggregated First Mortgages | Hotel, West, Floating (2 mortgages) | Basis Swap, Prime Rate | Minimum        
Investments in loans        
Basis spread on variable rate (0.56%)      
Aggregated First Mortgages | Hotel, West, Floating (2 mortgages) | Basis Swap, Prime Rate | Maximum        
Investments in loans        
Basis spread on variable rate 6.44%      
Aggregated First Mortgages | Industrial International, Floating (4 mortgages)        
Investments in loans        
Number of loans | mortgage 4      
Carrying amount $ 149,150      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Industrial International, Floating (4 mortgages) | Three Month BBSY | Minimum        
Investments in loans        
Basis spread on variable rate 3.10%      
Aggregated First Mortgages | Industrial International, Floating (4 mortgages) | Three Month BBSY | Maximum        
Investments in loans        
Basis spread on variable rate 3.55%      
Aggregated First Mortgages | Industrial International, Floating (9 mortgages)        
Investments in loans        
Number of loans | mortgage 9      
Carrying amount $ 414,525      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Industrial International, Floating (9 mortgages) | Three Month EURIBOR | Minimum        
Investments in loans        
Basis spread on variable rate 2.25%      
Aggregated First Mortgages | Industrial International, Floating (9 mortgages) | Three Month EURIBOR | Maximum        
Investments in loans        
Basis spread on variable rate 11.00%      
Aggregated First Mortgages | Industrial, International, Floating, (2 Mortgages)        
Investments in loans        
Number of loans | mortgage 2      
Carrying amount $ 83,935      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Industrial, International, Floating, (2 Mortgages) | SONIA | Minimum        
Investments in loans        
Basis spread on variable rate 2.27%      
Aggregated First Mortgages | Industrial, International, Floating, (2 Mortgages) | SONIA | Maximum        
Investments in loans        
Basis spread on variable rate 4.50%      
Aggregated First Mortgages | Industrial, North East, Floating (13 mortgages)        
Investments in loans        
Number of loans | mortgage 13      
Carrying amount $ 428,397      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Industrial, North East, Floating (13 mortgages) | SOFR | Minimum        
Investments in loans        
Basis spread on variable rate 3.22%      
Aggregated First Mortgages | Industrial, North East, Floating (13 mortgages) | SOFR | Maximum        
Investments in loans        
Basis spread on variable rate 8.06%      
Aggregated First Mortgages | Industrial, South East, Fixed (4 mortgages)        
Investments in loans        
Number of loans | mortgage 4      
Carrying amount $ 31,128      
Interest rate 8.18%      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Industrial, West, Floating, (6 Mortgages)        
Investments in loans        
Number of loans | mortgage 6      
Carrying amount $ 129,521      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Industrial, West, Floating, (6 Mortgages) | SOFR | Minimum        
Investments in loans        
Basis spread on variable rate 1.85%      
Aggregated First Mortgages | Industrial, West, Floating, (6 Mortgages) | SOFR | Maximum        
Investments in loans        
Basis spread on variable rate 7.60%      
Aggregated First Mortgages | Mixed Use, International, Floating, 2 Mortgages        
Investments in loans        
Number of loans | mortgage 2      
Carrying amount $ 89,017      
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)        
Investments in loans        
Number of loans | mortgage 1      
Carrying amount $ 446,578      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Mixed Use, International, Floating (1 mortgage) | SONIA        
Investments in loans        
Basis spread on variable rate 5.40%      
Aggregated First Mortgages | Mixed Use, Mid Atlantic, Floating (1 mortgage)        
Investments in loans        
Number of loans | mortgage 1      
Carrying amount $ 215,383      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Mixed Use, Mid Atlantic, Floating (1 mortgage) | SOFR        
Investments in loans        
Basis spread on variable rate 3.26%      
Aggregated First Mortgages | Mixed Use, South East, Floating (14 mortgages)        
Investments in loans        
Number of loans | mortgage 14      
Carrying amount $ 151,452      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Mixed Use, South East, Floating (14 mortgages) | SOFR | Minimum        
Investments in loans        
Basis spread on variable rate 2.18%      
Aggregated First Mortgages | Mixed Use, South East, Floating (14 mortgages) | SOFR | Maximum        
Investments in loans        
Basis spread on variable rate 8.70%      
Aggregated First Mortgages | Mixed Use, South West, Floating (6 mortgages)        
Investments in loans        
Number of loans | mortgage 6      
Carrying amount $ 238,840      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Mixed Use, South West, Floating (6 mortgages) | SOFR        
Investments in loans        
Basis spread on variable rate 4.60%      
Aggregated First Mortgages | Multi-family, International, Floating (1 mortgage) 1BBSY        
Investments in loans        
Number of loans | mortgage 1      
Carrying amount $ 52,060      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Multi-family, International, Floating (1 mortgage) 1BBSY | One Month BBSY        
Investments in loans        
Basis spread on variable rate 3.75%      
Aggregated First Mortgages | Multi-family, International, Floating (1 mortgage) 3BBSY        
Investments in loans        
Number of loans | mortgage 1      
Carrying amount $ 158,305      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Multi-family, International, Floating (1 mortgage) 3BBSY | Three Month BBSY        
Investments in loans        
Basis spread on variable rate 3.95%      
Aggregated First Mortgages | Multi-family, International, Floating (8 mortgages)        
Investments in loans        
Number of loans | mortgage 8      
Carrying amount $ 767,344      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Multi-family, International, Floating (8 mortgages) | SONIA | Minimum        
Investments in loans        
Basis spread on variable rate 2.76%      
Aggregated First Mortgages | Multi-family, International, Floating (8 mortgages) | SONIA | Maximum        
Investments in loans        
Basis spread on variable rate 4.07%      
Aggregated First Mortgages | Multi-family, Mid Atlantic, Floating (16 mortgages)        
Investments in loans        
Number of loans | mortgage 16      
Carrying amount $ 382,131      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Multi-family, Mid Atlantic, Floating (16 mortgages) | SOFR | Minimum        
Investments in loans        
Basis spread on variable rate 1.85%      
Aggregated First Mortgages | Multi-family, Mid Atlantic, Floating (16 mortgages) | SOFR | Maximum        
Investments in loans        
Basis spread on variable rate 9.00%      
Aggregated First Mortgages | Multi-family, Midwest, Floating (4 mortgages)        
Investments in loans        
Number of loans | mortgage 4      
Carrying amount $ 76,626      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Multi-family, Midwest, Floating (4 mortgages) | SOFR | Minimum        
Investments in loans        
Basis spread on variable rate 2.85%      
Aggregated First Mortgages | Multi-family, Midwest, Floating (4 mortgages) | SOFR | Maximum        
Investments in loans        
Basis spread on variable rate 9.85%      
Aggregated First Mortgages | Multi-family, North East, Floating (27 mortgages)        
Investments in loans        
Number of loans | mortgage 27      
Carrying amount $ 789,236      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Multi-family, North East, Floating (27 mortgages) | SOFR | Minimum        
Investments in loans        
Basis spread on variable rate 2.25%      
Aggregated First Mortgages | Multi-family, North East, Floating (27 mortgages) | SOFR | Maximum        
Investments in loans        
Basis spread on variable rate 10.85%      
Aggregated First Mortgages | Multi-family, South East, Floating (51 mortgages)        
Investments in loans        
Number of loans | mortgage 51      
Carrying amount $ 1,352,286      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Multi-family, South East, Floating (51 mortgages) | SOFR | Minimum        
Investments in loans        
Basis spread on variable rate 1.75%      
Aggregated First Mortgages | Multi-family, South East, Floating (51 mortgages) | SOFR | Maximum        
Investments in loans        
Basis spread on variable rate 16.50%      
Aggregated First Mortgages | Multi-family, South West, Floating (102 mortgages)        
Investments in loans        
Number of loans | mortgage 102      
Carrying amount $ 1,669,342      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Multi-family, South West, Floating (102 mortgages) | SOFR | Minimum        
Investments in loans        
Basis spread on variable rate 1.75%      
Aggregated First Mortgages | Multi-family, South West, Floating (102 mortgages) | SOFR | Maximum        
Investments in loans        
Basis spread on variable rate 16.50%      
Aggregated First Mortgages | Multi-family, West, Floating (19 mortgages)        
Investments in loans        
Number of loans | mortgage 19      
Carrying amount $ 565,695      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Multi-family, West, Floating (19 mortgages) | SOFR | Minimum        
Investments in loans        
Basis spread on variable rate 2.60%      
Aggregated First Mortgages | Multi-family, West, Floating (19 mortgages) | SOFR | Maximum        
Investments in loans        
Basis spread on variable rate 8.85%      
Aggregated First Mortgages | Office, International, Floating (3 mortgages)        
Investments in loans        
Number of loans | mortgage 3      
Carrying amount $ 240,082      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Office, International, Floating (3 mortgages) | Three Month EURIBOR | Minimum        
Investments in loans        
Basis spread on variable rate 2.74%      
Aggregated First Mortgages | Office, International, Floating (3 mortgages) | Three Month EURIBOR | Maximum        
Investments in loans        
Basis spread on variable rate 7.50%      
Aggregated First Mortgages | Office, International, Floating (1 mortgage)        
Investments in loans        
Number of loans | mortgage 1      
Carrying amount $ 80,089      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Office, International, Floating (1 mortgage) | One Month EURIBOR        
Investments in loans        
Basis spread on variable rate 6.00%      
Aggregated First Mortgages | Office, International, Floating (6 mortgages)        
Investments in loans        
Number of loans | mortgage 6      
Carrying amount $ 467,828      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Office, International, Floating (6 mortgages) | SONIA | Minimum        
Investments in loans        
Basis spread on variable rate 3.55%      
Aggregated First Mortgages | Office, International, Floating (6 mortgages) | SONIA | Maximum        
Investments in loans        
Basis spread on variable rate 4.37%      
Aggregated First Mortgages | Office, Mid Atlantic, Floating (33 mortgages)        
Investments in loans        
Number of loans | mortgage 33      
Carrying amount $ 550,892      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Office, Mid Atlantic, Floating (33 mortgages) | SOFR | Minimum        
Investments in loans        
Basis spread on variable rate 2.35%      
Aggregated First Mortgages | Office, Mid Atlantic, Floating (33 mortgages) | SOFR | Maximum        
Investments in loans        
Basis spread on variable rate 7.35%      
Aggregated First Mortgages | Office, Mid Atlantic, Floating (14 mortgages)        
Investments in loans        
Number of loans | mortgage 14      
Carrying amount $ 246,657      
Principal Amount of Delinquent Loans $ 122,310      
Aggregated First Mortgages | Office, Mid Atlantic, Floating (14 mortgages) | Prime Rate | Minimum        
Investments in loans        
Basis spread on variable rate 0.19%      
Aggregated First Mortgages | Office, Mid Atlantic, Floating (14 mortgages) | Prime Rate | Maximum        
Investments in loans        
Basis spread on variable rate 0.93%      
Aggregated First Mortgages | Office, Midwest, Floating (17 mortgages)        
Investments in loans        
Number of loans | mortgage 17      
Carrying amount $ 144,834      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Office, Midwest, Floating (17 mortgages) | SOFR | Minimum        
Investments in loans        
Basis spread on variable rate 1.85%      
Aggregated First Mortgages | Office, Midwest, Floating (17 mortgages) | SOFR | Maximum        
Investments in loans        
Basis spread on variable rate 9.85%      
Aggregated First Mortgages | Office, North East, Fixed (8 mortgages)        
Investments in loans        
Number of loans | mortgage 8      
Carrying amount $ 95,527      
Interest rate 6.00%      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Office, North East, Floating (26 mortgages)        
Investments in loans        
Number of loans | mortgage 26      
Carrying amount $ 459,933      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Office, North East, Floating (26 mortgages) | SOFR | Minimum        
Investments in loans        
Basis spread on variable rate 2.70%      
Aggregated First Mortgages | Office, North East, Floating (26 mortgages) | SOFR | Maximum        
Investments in loans        
Basis spread on variable rate 8.70%      
Aggregated First Mortgages | Office, South East, Fixed (2 mortgages)        
Investments in loans        
Number of loans | mortgage 2      
Carrying amount $ 47,835      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Office, South East, Fixed (2 mortgages) | Minimum        
Investments in loans        
Interest rate 5.00%      
Aggregated First Mortgages | Office, South East, Fixed (2 mortgages) | Maximum        
Investments in loans        
Interest rate 12.00%      
Aggregated First Mortgages | Office, South East, Floating (16 mortgages)        
Investments in loans        
Number of loans | mortgage 16      
Carrying amount $ 326,372      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Office, South East, Floating (16 mortgages) | SOFR | Minimum        
Investments in loans        
Basis spread on variable rate 1.75%      
Aggregated First Mortgages | Office, South East, Floating (16 mortgages) | SOFR | Maximum        
Investments in loans        
Basis spread on variable rate 10.50%      
Aggregated First Mortgages | Office, South West, Floating (26 mortgages)        
Investments in loans        
Number of loans | mortgage 26      
Carrying amount $ 454,815      
Principal Amount of Delinquent Loans $ 252,000      
Aggregated First Mortgages | Office, South West, Floating (26 mortgages) | SOFR | Minimum        
Investments in loans        
Basis spread on variable rate 2.10%      
Aggregated First Mortgages | Office, South West, Floating (26 mortgages) | SOFR | Maximum        
Investments in loans        
Basis spread on variable rate 8.35%      
Aggregated First Mortgages | Office, West, Floating (32 mortgages)        
Investments in loans        
Number of loans | mortgage 32      
Carrying amount $ 314,862      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Office, West, Floating (32 mortgages) | SOFR | Minimum        
Investments in loans        
Basis spread on variable rate 2.10%      
Aggregated First Mortgages | Office, West, Floating (32 mortgages) | SOFR | Maximum        
Investments in loans        
Basis spread on variable rate 6.10%      
Aggregated First Mortgages | Other, International, Floating (2 mortgages)        
Investments in loans        
Number of loans | mortgage 2      
Carrying amount $ 275,698      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Other, International, Floating (2 mortgages) | SONIA | Minimum        
Investments in loans        
Basis spread on variable rate 4.40%      
Aggregated First Mortgages | Other, International, Floating (2 mortgages) | SONIA | Maximum        
Investments in loans        
Basis spread on variable rate 8.05%      
Aggregated First Mortgages | Other, Midwest, Floating (2 mortgages)        
Investments in loans        
Number of loans | mortgage 2      
Carrying amount $ 29,702      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Other, Midwest, Floating (2 mortgages) | SOFR | Minimum        
Investments in loans        
Basis spread on variable rate 5.00%      
Aggregated First Mortgages | Other, Midwest, Floating (2 mortgages) | SOFR | Maximum        
Investments in loans        
Basis spread on variable rate 12.50%      
Aggregated First Mortgages | Other, North East, Fixed (1 mortgage)        
Investments in loans        
Number of loans | mortgage 1      
Carrying amount $ 9,200      
Interest rate 4.09%      
Principal Amount of Delinquent Loans $ 9,200      
Aggregated First Mortgages | Other, South West, Fixed (1 mortgage)        
Investments in loans        
Number of loans | mortgage 1      
Carrying amount $ 20,000      
Interest rate 7.00%      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Residential, North East, Floating (3 mortgages)        
Investments in loans        
Number of loans | mortgage 3      
Carrying amount $ 194,269      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Residential, North East, Floating (3 mortgages) | SOFR        
Investments in loans        
Basis spread on variable rate 4.10%      
Aggregated First Mortgages | Residential, South East, Floating (4 mortgages)        
Investments in loans        
Number of loans | mortgage 4      
Carrying amount $ 16,213      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Residential, South East, Floating (4 mortgages) | SOFR        
Investments in loans        
Basis spread on variable rate 5.80%      
Aggregated First Mortgages | Residential, West, Floating (2 mortgages)        
Investments in loans        
Number of loans | mortgage 2      
Carrying amount $ 18,582      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Residential, West, Floating (2 mortgages) | SOFR        
Investments in loans        
Basis spread on variable rate 3.87%      
Aggregated First Mortgages | Retail, North East, Floating (2 mortgages )        
Investments in loans        
Number of loans | mortgage 2      
Carrying amount $ 185,386      
Principal Amount of Delinquent Loans $ 0      
Aggregated First Mortgages | Retail, North East, Floating (2 mortgages ) | SOFR        
Investments in loans        
Basis spread on variable rate 9.00%      
Aggregated First Mortgages | Loans Held-for-Sale, Various, Fixed        
Investments in loans        
Carrying amount $ 2,645,637      
Principal Amount of Delinquent Loans $ 68,688      
Aggregated First Mortgages | Loans Held-for-Sale, Various, Fixed | Minimum        
Investments in loans        
Interest rate 2.80%      
Aggregated First Mortgages | Loans Held-for-Sale, Various, Fixed | Maximum        
Investments in loans        
Interest rate 9.90%      
Aggregated Subordinated and Mezzanine Loans        
Investments in loans        
Loan Loss Allowance $ (298,775)      
Prepaid Loan Costs, Net $ 3,445      
Aggregated Subordinated and Mezzanine Loans | Hotel, West, Floating (2 mortgages)        
Investments in loans        
Number of loans | mortgage 2      
Carrying amount $ 19,179      
Principal Amount of Delinquent Loans $ 0      
Aggregated Subordinated and Mezzanine Loans | Hotel, West, Floating (2 mortgages) | SOFR        
Investments in loans        
Basis spread on variable rate 11.08%      
Aggregated Subordinated and Mezzanine Loans | Hotel, South East, Floating (1 mortgage)        
Investments in loans        
Number of loans | mortgage 1      
Carrying amount $ 38,563      
Principal Amount of Delinquent Loans $ 0      
Aggregated Subordinated and Mezzanine Loans | Hotel, South East, Floating (1 mortgage) | SOFR        
Investments in loans        
Basis spread on variable rate 9.47%      
Aggregated Subordinated and Mezzanine Loans | Industrial, South East, Fixed (1 mortgage)        
Investments in loans        
Number of loans | mortgage 1      
Carrying amount $ 3,967      
Interest rate 8.18%      
Principal Amount of Delinquent Loans $ 0      
Aggregated Subordinated and Mezzanine Loans | Industrial, South East, Floating (2 mortgages)        
Investments in loans        
Number of loans | mortgage 2      
Carrying amount $ 9,214      
Principal Amount of Delinquent Loans $ 0      
Aggregated Subordinated and Mezzanine Loans | Industrial, South East, Floating (2 mortgages) | SOFR        
Investments in loans        
Basis spread on variable rate 9.43%      
Aggregated Subordinated and Mezzanine Loans | Industrial, South West, Floating (2 mortgages)        
Investments in loans        
Number of loans | mortgage 2      
Carrying amount $ 17,660      
Principal Amount of Delinquent Loans $ 0      
Aggregated Subordinated and Mezzanine Loans | Industrial, South West, Floating (2 mortgages) | SOFR        
Investments in loans        
Basis spread on variable rate 10.15%      
Aggregated Subordinated and Mezzanine Loans | Industrial, West, Floating (2 mortgages)        
Investments in loans        
Number of loans | mortgage 2      
Carrying amount $ 12,185      
Principal Amount of Delinquent Loans $ 0      
Aggregated Subordinated and Mezzanine Loans | Industrial, West, Floating (2 mortgages) | SOFR        
Investments in loans        
Basis spread on variable rate 11.40%      
Aggregated Subordinated and Mezzanine Loans | Multi-family, North East, Floating (3 mortgages)        
Investments in loans        
Number of loans | mortgage 3      
Carrying amount $ 75,168      
Principal Amount of Delinquent Loans $ 0      
Aggregated Subordinated and Mezzanine Loans | Multi-family, North East, Floating (3 mortgages) | SOFR | Minimum        
Investments in loans        
Basis spread on variable rate 3.35%      
Aggregated Subordinated and Mezzanine Loans | Multi-family, North East, Floating (3 mortgages) | SOFR | Maximum        
Investments in loans        
Basis spread on variable rate 13.75%      
Aggregated Subordinated and Mezzanine Loans | Office, International, Floating (5 mortgages)        
Investments in loans        
Number of loans | mortgage 5      
Carrying amount $ 36,784      
Principal Amount of Delinquent Loans $ 0      
Aggregated Subordinated and Mezzanine Loans | Office, International, Floating (5 mortgages) | Three Month EURIBOR | Minimum        
Investments in loans        
Basis spread on variable rate 7.00%      
Aggregated Subordinated and Mezzanine Loans | Office, International, Floating (5 mortgages) | Three Month EURIBOR | Maximum        
Investments in loans        
Basis spread on variable rate 8.95%      
Aggregated Subordinated and Mezzanine Loans | Office, West, Floating (2 mortgages)        
Investments in loans        
Number of loans | mortgage 2      
Carrying amount $ 81,549      
Principal Amount of Delinquent Loans $ 0      
Aggregated Subordinated and Mezzanine Loans | Office, West, Floating (2 mortgages) | SOFR        
Investments in loans        
Basis spread on variable rate 6.34%      
Aggregated Subordinated and Mezzanine Loans | Retail, Midwest, Fixed (1 mortgage)        
Investments in loans        
Number of loans | mortgage 1      
Carrying amount $ 4,925      
Interest rate 7.16%      
Principal Amount of Delinquent Loans $ 4,925      
Aggregated Subordinated and Mezzanine Loans | Residential, North East, Floating (2 mortgages)        
Investments in loans        
Number of loans | mortgage 2      
Carrying amount $ 9,988      
Principal Amount of Delinquent Loans $ 0      
Aggregated Subordinated and Mezzanine Loans | Residential, North East, Floating (2 mortgages) | SOFR        
Investments in loans        
Basis spread on variable rate 7.75%      
Aggregated Subordinated and Mezzanine Loans | Residential, West, Fixed (1 mortgage)        
Investments in loans        
Number of loans | mortgage 1      
Carrying amount $ 40,525      
Interest rate 9.00%      
Principal Amount of Delinquent Loans $ 0