Derivative Instruments - Schedule of Components of Realized and Unrealized Gains and Losses (Details) - Trading - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Realized Gains (Losses)	$ (6,851)	$ (9,614)	$ 65,416	$ 24,157
Unrealized Gains (Losses)	305,183	(3,371)	369,895	(110,910)
Interest rate caps
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Realized Gains (Losses)	0	0	0	0
Unrealized Gains (Losses)	147	9	479	54
Options
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Realized Gains (Losses)	(968)	(517)	(2,068)	2,125
Unrealized Gains (Losses)	173	(408)	(223)	(408)
IRLCs
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Realized Gains (Losses)	0	0	0	0
Unrealized Gains (Losses)	(641)	(1,919)	(412)	(1,919)
TBAs
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Realized Gains (Losses)	(7,566)	484	(10,295)	480
Unrealized Gains (Losses)	(5,742)	(226)	(4,332)	(121)
Interest rate swaps
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Realized Gains (Losses)	3,342	1,804	11,053	33,219
Unrealized Gains (Losses)	218,856	(5,868)	291,992	(106,470)
Credit default swaps
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Realized Gains (Losses)	(379)	(1,240)	(1,041)	(3,454)
Unrealized Gains (Losses)	346	210	624	(542)
U.S. Treasury futures
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Realized Gains (Losses)	3,555	(10,145)	26,872	(8,213)
Unrealized Gains (Losses)	97,247	1,476	94,671	(4,859)
Commodity futures
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Realized Gains (Losses)	(4,835)	0	40,922	0
Unrealized Gains (Losses)	(5,203)	3,355	(12,904)	3,355
Index futures
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Realized Gains (Losses)	0	0	(27)	0
Unrealized Gains (Losses)	$ 0	$ 0	$ 0	$ 0