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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, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Accrued interest	$ 13,200,000		$ 13,200,000		$ 9,800,000
Unrealized losses on investment securities available for sale	14,600,000	$ 8,500,000	$ 47,900,000	$ 7,700,000
Realized loss on write-downs		(41,000)		(41,000)
Contractual maturities (up to)			39 years
Weighted average life of available for sale securities portfolio			6 years 6 months		6 years 10 months 24 days
Non Agency RMBS Held In Securitization Trust | Non-Agency RMBS
Debt Securities, Available-for-sale [Line Items]
Realized loss on write-downs	$ (100,000)	$ 0	$ (500,000)	$ 0

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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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Amount of realized gain (loss) 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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Amount of unrealized gain (loss) 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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