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Investment Securities Available For Sale, at Fair Value - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]
Accrued interest	$ 32,200,000		$ 32,200,000		$ 22,400,000
Unrealized gains on investment securities available for sale	47,800,000	$ 58,300,000	148,800,000	$ 10,400,000
Sales proceeds	$ 0	0	663,336,000	0
Realized loss on write-downs			$ (26,818,000)
Contractual maturities (up to)			38 years
Weighted average life of available for sale securities portfolio			6 years 6 months		7 years 4 months 24 days
Agency RMBS IOs
Debt Securities, Available-for-sale [Line Items]
Realized loss on write-downs			$ (2,500,000)
Non-Agency RMBS
Debt Securities, Available-for-sale [Line Items]
Sales proceeds			4,573,000
Realized loss on write-downs		$ (400,000)	$ 52,000	$ (900,000)

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