Commercial Mortgage Loans, Held for Investment - Schedule of Past Due (Details) $ in Thousands	Jun. 30, 2026 USD ($) loan	Dec. 31, 2025 USD ($) loan
Financing Receivable, Past Due [Line Items]
Amortized cost	$ 22,300,000	$ 21,600,000
Commercial Mortgage Receivable, Held-For-Investment
Financing Receivable, Past Due [Line Items]
Amortized cost	$ 4,329,579	$ 4,421,436
Number of loans \| loan	172	169
Commercial Portfolio Segment \| Commercial Mortgage Receivable, Held-For-Investment
Financing Receivable, Past Due [Line Items]
Amortized cost	$ 4,329,579	$ 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	9	7
Commercial Portfolio Segment \| Commercial Mortgage Receivable, Held-For-Investment \| Current
Financing Receivable, Past Due [Line Items]
Amortized cost	$ 3,961,365
Commercial Portfolio Segment \| Commercial Mortgage Receivable, Held-For-Investment \| Less than 90 days past due
Financing Receivable, Past Due [Line Items]
Amortized cost	129,948
Commercial Portfolio Segment \| Commercial Mortgage Receivable, Held-For-Investment \| 90 or more days past due
Financing Receivable, Past Due [Line Items]
Amortized cost	$ 238,266
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	7
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