Commercial Mortgage Loans, Held for Investment - Schedule of Past Due (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2026 USD ($) loan	Dec. 31, 2025 USD ($) loan
Financing Receivable, Past Due [Line Items]
Amortized cost	$ 22,000,000	$ 21,600,000
Commercial Mortgage Receivable, Held-For-Investment
Financing Receivable, Past Due [Line Items]
Amortized cost	$ 4,596,001	$ 4,421,436
Number of loans \| loan	177	169
Commercial Portfolio Segment \| Commercial Mortgage Receivable, Held-For-Investment
Financing Receivable, Past Due [Line Items]
Amortized cost	$ 4,596,001	$ 4,421,436
Commercial Portfolio Segment \| Commercial Mortgage Receivable, Held-For-Investment \| Nonperforming Financial Instruments
Financing Receivable, Past Due [Line Items]
Number of loans \| loan		7
Commercial Portfolio Segment \| Commercial Mortgage Receivable, Held-For-Investment \| Current
Financing Receivable, Past Due [Line Items]
Amortized cost	4,254,872
Commercial Portfolio Segment \| Commercial Mortgage Receivable, Held-For-Investment \| Less than 90 days past due
Financing Receivable, Past Due [Line Items]
Amortized cost	150,513
Commercial Portfolio Segment \| Commercial Mortgage Receivable, Held-For-Investment \| 90 or more days past due
Financing Receivable, Past Due [Line Items]
Amortized cost	$ 190,616
Commercial Portfolio Segment \| Commercial Mortgage Receivable, Held-For-Investment \| 90 or more days past due \| Multifamily
Financing Receivable, Past Due [Line Items]
Number of loans \| loan	6
Commercial Portfolio Segment \| Commercial Mortgage Receivable, Held-For-Investment \| 90 or more days past due \| Multifamily \| Nonperforming Financial Instruments
Financing Receivable, Past Due [Line Items]
Number of loans \| loan	1