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Available-for-Sale Securities, at Fair Value - Amortized Cost and Carrying Value of AFS Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Principal/ Current Face	$ 9,249,851		$ 8,567,184
Un-amortized Premium	165,191		167,214
Accretable Purchase Discount	(107,905)		(71,132)
Amortized Cost	8,436,743		7,697,027
Allowance for Credit Losses	(2,235)	$ (2,680)	(2,866)	$ (3,340)	$ (3,607)	$ (3,943)
Unrealized Gain	29,483		3,506
Unrealized Loss	(143,234)		(325,956)
Carrying Value	8,320,757		7,371,711
Total Agency
Debt Securities, Available-for-sale [Line Items]
Principal/ Current Face	8,769,239		8,063,260
Un-amortized Premium	161,699		163,490
Accretable Purchase Discount	(107,891)		(71,116)
Amortized Cost	8,432,733		7,692,748
Allowance for Credit Losses	(1,894)	(2,273)	(2,386)	(2,893)	(3,217)	(3,619)
Unrealized Gain	29,277		3,262
Unrealized Loss	(142,808)		(325,647)
Carrying Value	8,317,308		7,367,977
Principal and interest
Debt Securities, Available-for-sale [Line Items]
Principal/ Current Face	8,378,925		7,600,374
Un-amortized Premium	136,588		135,743
Accretable Purchase Discount	(107,891)		(71,116)
Amortized Cost	8,407,622		7,665,001
Allowance for Credit Losses	0		0
Unrealized Gain	28,749		2,789
Unrealized Loss	(140,569)		(321,829)
Carrying Value	8,295,802		7,345,961
Interest-only
Debt Securities, Available-for-sale [Line Items]
Principal/ Current Face	390,314		462,886
Un-amortized Premium	25,111		27,747
Accretable Purchase Discount	0		0
Amortized Cost	25,111		27,747
Allowance for Credit Losses	(1,894)		(2,386)
Unrealized Gain	528		473
Unrealized Loss	(2,239)		(3,818)
Carrying Value	21,506		22,016
Non-Agency
Debt Securities, Available-for-sale [Line Items]
Principal/ Current Face	480,612		503,924
Un-amortized Premium	3,492		3,724
Accretable Purchase Discount	(14)		(16)
Amortized Cost	4,010		4,279
Allowance for Credit Losses	(341)	$ (407)	(480)	$ (447)	$ (390)	$ (324)
Unrealized Gain	206		244
Unrealized Loss	(426)		(309)
Carrying Value	$ 3,449		$ 3,734