v3.26.3
Commercial Mortgage Loans, Held for Investment - Schedule of Allocation by Risk Rating (Details)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2026
USD ($)
loan
Dec. 31, 2025
USD ($)
loan
Jun. 30, 2026
USD ($)
Mar. 31, 2026
USD ($)
Dec. 31, 2024
USD ($)
Financing Receivable, Credit Quality Indicator [Line Items]          
Amortized cost $ 22,800,000 $ 21,600,000      
Amortized Cost by Year of Origination          
Total Amortized Cost 22,800,000 21,600,000      
Allowance for credit losses [1] (71,932) (38,302)      
Total commercial mortgage loans, held for investment, net [1] $ 3,967,590 $ 4,383,134      
Commercial Mortgage Receivable, Held-For-Investment          
Financing Receivable, Credit Quality Indicator [Line Items]          
Number of Loans | loan 175 169      
Amortized cost $ 4,039,522 $ 4,421,436      
Amortized Cost by Year of Origination          
Total Amortized Cost 4,039,522 4,421,436      
Allowance for credit losses (71,932) (38,302)     $ (78,083)
Total commercial mortgage loans, held for investment, net 3,967,590 4,383,134      
Commercial Portfolio Segment          
Amortized Cost by Year of Origination          
Allowance for credit losses (72,138) (38,598) $ (54,682) $ (49,507)  
Commercial Portfolio Segment | Commercial Mortgage Receivable, Held-For-Investment          
Financing Receivable, Credit Quality Indicator [Line Items]          
Amortized cost 4,039,522 4,421,436      
Amortized Cost by Year of Origination          
Year one, originated in current fiscal year 714,624 982,678      
Year two, originated in prior fiscal year one 1,130,659 1,480,534      
Year three, originated in prior fiscal year two 1,146,995 452,282      
Year four, originated in prior fiscal year three 313,139 791,010      
Year five, original in prior fiscal year four 471,385 658,522      
Prior 262,720 56,410      
Total Amortized Cost 4,039,522 4,421,436      
Allowance for credit losses (71,932) (38,302)      
Total commercial mortgage loans, held for investment, net $ 3,967,590 $ 4,383,134      
Commercial Portfolio Segment | Commercial Mortgage Receivable, Held-For-Investment | Credit Concentration Risk | Commercial mortgage loans, held for investment          
Amortized Cost by Year of Origination          
% of Portfolio 100.00% 100.00%      
Commercial Portfolio Segment | Commercial Mortgage Receivable, Held-For-Investment | 1          
Financing Receivable, Credit Quality Indicator [Line Items]          
Amortized cost $ 0 $ 0      
Amortized Cost by Year of Origination          
Year one, originated in current fiscal year 0 0      
Year two, originated in prior fiscal year one 0 0      
Year three, originated in prior fiscal year two 0 0      
Year four, originated in prior fiscal year three 0 0      
Year five, original in prior fiscal year four 0 0      
Prior 0 0      
Total Amortized Cost $ 0 $ 0      
Commercial Portfolio Segment | Commercial Mortgage Receivable, Held-For-Investment | 1 | Credit Concentration Risk | Commercial mortgage loans, held for investment          
Amortized Cost by Year of Origination          
% of Portfolio 0.00% 0.00%      
Commercial Portfolio Segment | Commercial Mortgage Receivable, Held-For-Investment | 2          
Financing Receivable, Credit Quality Indicator [Line Items]          
Amortized cost $ 2,957,925 $ 3,202,379      
Amortized Cost by Year of Origination          
Year one, originated in current fiscal year 714,624 982,678      
Year two, originated in prior fiscal year one 1,032,100 1,175,376      
Year three, originated in prior fiscal year two 764,457 322,490      
Year four, originated in prior fiscal year three 215,954 387,548      
Year five, original in prior fiscal year four 132,053 313,728      
Prior 98,737 20,559      
Total Amortized Cost $ 2,957,925 $ 3,202,379      
Commercial Portfolio Segment | Commercial Mortgage Receivable, Held-For-Investment | 2 | Credit Concentration Risk | Commercial mortgage loans, held for investment          
Amortized Cost by Year of Origination          
% of Portfolio 73.20% 72.40%      
Commercial Portfolio Segment | Commercial Mortgage Receivable, Held-For-Investment | 3          
Financing Receivable, Credit Quality Indicator [Line Items]          
Amortized cost $ 751,427 $ 848,296      
Amortized Cost by Year of Origination          
Year one, originated in current fiscal year 0 0      
Year two, originated in prior fiscal year one 75,482 305,158      
Year three, originated in prior fiscal year two 330,658 129,792      
Year four, originated in prior fiscal year three 97,185 220,090      
Year five, original in prior fiscal year four 214,246 178,500      
Prior 33,856 14,756      
Total Amortized Cost $ 751,427 $ 848,296      
Commercial Portfolio Segment | Commercial Mortgage Receivable, Held-For-Investment | 3 | Credit Concentration Risk | Commercial mortgage loans, held for investment          
Amortized Cost by Year of Origination          
% of Portfolio 18.60% 19.20%      
Commercial Portfolio Segment | Commercial Mortgage Receivable, Held-For-Investment | 4          
Financing Receivable, Credit Quality Indicator [Line Items]          
Amortized cost $ 140,678 $ 246,679      
Amortized Cost by Year of Origination          
Year one, originated in current fiscal year 0 0      
Year two, originated in prior fiscal year one 23,077 0      
Year three, originated in prior fiscal year two 51,880 0      
Year four, originated in prior fiscal year three 0 138,889      
Year five, original in prior fiscal year four 0 107,790      
Prior 65,721 0      
Total Amortized Cost $ 140,678 $ 246,679      
Commercial Portfolio Segment | Commercial Mortgage Receivable, Held-For-Investment | 4 | Credit Concentration Risk | Commercial mortgage loans, held for investment          
Amortized Cost by Year of Origination          
% of Portfolio 3.50% 5.60%      
Commercial Portfolio Segment | Commercial Mortgage Receivable, Held-For-Investment | 5          
Financing Receivable, Credit Quality Indicator [Line Items]          
Amortized cost $ 189,492 $ 124,082      
Amortized Cost by Year of Origination          
Year one, originated in current fiscal year 0 0      
Year two, originated in prior fiscal year one 0 0      
Year three, originated in prior fiscal year two 0 0      
Year four, originated in prior fiscal year three 0 44,483      
Year five, original in prior fiscal year four 125,086 58,504      
Prior 64,406 21,095      
Total Amortized Cost $ 189,492 $ 124,082      
Commercial Portfolio Segment | Commercial Mortgage Receivable, Held-For-Investment | 5 | Credit Concentration Risk | Commercial mortgage loans, held for investment          
Amortized Cost by Year of Origination          
% of Portfolio 4.70% 2.80%      
Commercial Mortgage Receivable, Held-For-Investment          
Financing Receivable, Credit Quality Indicator [Line Items]          
Number of Loans | loan 175 169      
Amortized cost $ 4,051,936 $ 4,435,511      
Amortized Cost by Year of Origination          
Total Amortized Cost $ 4,051,936 $ 4,435,511      
Commercial Mortgage Receivable, Held-For-Investment | 1          
Financing Receivable, Credit Quality Indicator [Line Items]          
Number of Loans | loan 0 0      
Amortized cost $ 0 $ 0      
Amortized Cost by Year of Origination          
Total Amortized Cost $ 0 $ 0      
Commercial Mortgage Receivable, Held-For-Investment | 2          
Financing Receivable, Credit Quality Indicator [Line Items]          
Number of Loans | loan 140 137      
Amortized cost $ 2,966,596 $ 3,213,933      
Amortized Cost by Year of Origination          
Total Amortized Cost $ 2,966,596 $ 3,213,933      
Commercial Mortgage Receivable, Held-For-Investment | 3          
Financing Receivable, Credit Quality Indicator [Line Items]          
Number of Loans | loan 22 22      
Amortized cost $ 751,693 $ 848,719      
Amortized Cost by Year of Origination          
Total Amortized Cost $ 751,693 $ 848,719      
Commercial Mortgage Receivable, Held-For-Investment | 4          
Financing Receivable, Credit Quality Indicator [Line Items]          
Number of Loans | loan 6 6      
Amortized cost $ 140,601 $ 246,682      
Amortized Cost by Year of Origination          
Total Amortized Cost $ 140,601 $ 246,682      
Commercial Mortgage Receivable, Held-For-Investment | 5          
Financing Receivable, Credit Quality Indicator [Line Items]          
Number of Loans | loan 7 4      
Amortized cost $ 193,046 $ 126,177      
Amortized Cost by Year of Origination          
Total Amortized Cost $ 193,046 $ 126,177      
[1] Includes pledged assets of $364.1 million and $329.2 million as of September 30, 2026 and December 31, 2025, respectively.