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Investment Securities Available For Sale, at Fair Value - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]
Accrued interest	$ 25,800,000		$ 25,800,000		$ 22,400,000
Unrealized gains (losses) on investment securities available for sale	14,500,000	$ (14,600,000)	101,000,000.0	$ (47,900,000)
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 2 months 12 days		7 years 4 months 24 days
Agency RMBS IOs
Debt Securities, Available-for-sale [Line Items]
Realized loss on write-downs	$ (2,500,000)		$ (2,500,000)
Non-Agency RMBS
Debt Securities, Available-for-sale [Line Items]
Sales proceeds			4,573,000
Realized loss on write-downs		$ (100,000)	$ 52,000	$ (500,000)

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Amount, after allowance for credit loss, of accrued interest on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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