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Investment Securities Available For Sale, at Fair Value - Realized Gain or Loss Activity (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Sales Proceeds	$ 64,690	$ 85,437	$ 432,585
Realized Gains	1,472	18,375	16,006
Realized Losses	(14,072)	(31)	(4,786)
Net Realized Gains (Losses)	(12,600)	18,344	11,220
ABS
Debt Securities, Available-for-sale [Line Items]
Sales Proceeds	595	36,215
Realized Gains	0	18,001
Realized Losses	(41)	0
Net Realized Gains (Losses)	(41)	18,001
CMBS
Debt Securities, Available-for-sale [Line Items]
Sales Proceeds	30,419		132,797
Realized Gains	0		11,083
Realized Losses	(1,387)		(452)
Net Realized Gains (Losses)	(1,387)		10,631
Non-Agency RMBS
Debt Securities, Available-for-sale [Line Items]
Sales Proceeds	33,676	24,374	176,166
Realized Gains	1,472	374	4,923
Realized Losses	(12,644)	0	(854)
Net Realized Gains (Losses)	$ (11,172)	374	4,069
Agency RMBS
Debt Securities, Available-for-sale [Line Items]
Sales Proceeds			123,622
Realized Gains			0
Realized Losses			(3,480)
Net Realized Gains (Losses)			$ (3,480)
U.S. Treasury Securities
Debt Securities, Available-for-sale [Line Items]
Sales Proceeds		24,848
Realized Gains		0
Realized Losses		(31)
Net Realized Gains (Losses)		$ (31)

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