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Investment Securities Available For Sale, at Fair Value - Schedule of Realized Gain or Loss Activity (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Debt Securities, Available-for-sale [Line Items]
Sales Proceeds	$ 0	$ 0	$ 663,336,000	$ 0
Realized Gains			3,752,000
Realized Losses			(30,570,000)
Net Realized Gains (Losses)			(26,818,000)
U.S. Treasury securities
Debt Securities, Available-for-sale [Line Items]
Sales Proceeds			658,763,000
Realized Gains			3,700,000
Realized Losses			(30,570,000)
Net Realized Gains (Losses)			(26,870,000)
Non-Agency RMBS
Debt Securities, Available-for-sale [Line Items]
Sales Proceeds			4,573,000
Realized Gains			52,000
Realized Losses			0
Net Realized Gains (Losses)		$ (400,000)	$ 52,000	$ (900,000)

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Amount of realized gain 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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