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Securities, at Fair Value - Impact of AFS Securities on AOCI (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
AOCI from AFS Securities:
Unrealized gain on AFS securities at beginning of period	$ 46,833	$ 79,607	$ 392,722
Unrealized (losses)/gains on securities available-for-sale	(25,492)	(32,774)	420,281
Reclassification adjustment for securities sales included in net income	0	0	(389,127)
Reclassification adjustment for impairments included in net income	0	0	(344,269)
Change in AOCI from AFS securities	(25,492)	(32,774)	(313,115)
Balance at end of period	21,341	46,833	79,607
Agency MBS
AOCI from AFS Securities:
Unrealized (losses)/gains on securities available-for-sale	$ (25,492)	$ (32,774)	$ 420,281

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