Investment Securities Available For Sale, at Fair Value - Realized Gain or Loss Activity (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Sales Proceeds	$ 724,474	$ 5,284	$ 64,690
Realized Gains	4,929	21	1,472
Realized Losses	(30,570)	0	(14,072)
Net Realized Gains (Losses)	(25,641)	21	(12,600)
U.S. Treasury securities
Debt Securities, Available-for-sale [Line Items]
Sales Proceeds	658,763
Realized Gains	3,700
Realized Losses	(30,570)
Net Realized Gains (Losses)	(26,870)
ABS
Debt Securities, Available-for-sale [Line Items]
Sales Proceeds			595
Realized Gains			0
Realized Losses			(41)
Net Realized Gains (Losses)			(41)
CMBS
Debt Securities, Available-for-sale [Line Items]
Sales Proceeds			30,419
Realized Gains			0
Realized Losses			(1,387)
Net Realized Gains (Losses)			(1,387)
Agency RMBS
Debt Securities, Available-for-sale [Line Items]
Sales Proceeds	61,138
Realized Gains	1,177
Realized Losses	0
Net Realized Gains (Losses)	1,177
Non-Agency RMBS
Debt Securities, Available-for-sale [Line Items]
Sales Proceeds	4,573	5,284	33,676
Realized Gains	52	21	1,472
Realized Losses	0	0	(12,644)
Net Realized Gains (Losses)	$ 52	$ 21	$ (11,172)

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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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