Available-for-Sale Securities, at Fair Value - Amortized Cost and Carrying Value of AFS Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Debt Securities, Available-for-sale [Line Items]
Principal/ Current Face	$ 5,646,557	$ 7,173,967
Un-amortized Premium	118,887	140,630
Accretable Purchase Discount	(8,905)	(24,913)
Amortized Cost	5,137,549	6,516,016
Allowance for Credit Losses	(360)	(1,609)
Unrealized Gain	11,893	44,683
Unrealized Loss	(57,763)	(44,619)
Carrying Value	5,091,319	6,514,471
Total Agency
Debt Securities, Available-for-sale [Line Items]
Principal/ Current Face	5,212,809	6,715,227
Un-amortized Premium	115,762	137,319
Accretable Purchase Discount	(8,893)	(24,900)
Amortized Cost	5,133,952	6,512,208
Allowance for Credit Losses	0	(1,319)
Unrealized Gain	11,744	44,513
Unrealized Loss	(57,359)	(44,190)
Carrying Value	5,088,337	6,511,212
Principal and interest
Debt Securities, Available-for-sale [Line Items]
Principal/ Current Face	5,027,083	6,399,789
Un-amortized Premium	103,874	118,427
Accretable Purchase Discount	(8,893)	(24,900)
Amortized Cost	5,122,064	6,493,316
Allowance for Credit Losses	0	0
Unrealized Gain	11,373	44,091
Unrealized Loss	(56,854)	(43,117)
Carrying Value	5,076,583	6,494,290
Interest-only
Debt Securities, Available-for-sale [Line Items]
Principal/ Current Face	185,726	315,438
Un-amortized Premium	11,888	18,892
Accretable Purchase Discount	0	0
Amortized Cost	11,888	18,892
Allowance for Credit Losses	0	(1,319)
Unrealized Gain	371	422
Unrealized Loss	(505)	(1,073)
Carrying Value	11,754	16,922
Non-Agency
Debt Securities, Available-for-sale [Line Items]
Principal/ Current Face	433,748	458,740
Un-amortized Premium	3,125	3,311
Accretable Purchase Discount	(12)	(13)
Amortized Cost	3,597	3,808
Allowance for Credit Losses	(360)	(290)
Unrealized Gain	149	170
Unrealized Loss	(404)	(429)
Carrying Value	$ 2,982	$ 3,259

This item represents the face value of debt securities, which are categorized neither as held-to-maturity nor trading.

No definition available.

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