Securities, at Fair Value - Impact of AFS Securities on AOCI (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
AOCI from AFS Securities:
Unrealized gain on AFS securities at beginning of period	$ 21,341	$ 46,833	$ 79,607
Unrealized gains/(losses) on securities available-for-sale	(2,873)	(25,492)	(32,774)
Reclassification adjustment for MBS sales included in net income	(770)	0	0
Change in AOCI from AFS securities	(3,643)	(25,492)	(32,774)
Balance at end of period	17,698	21,341	46,833
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises
AOCI from AFS Securities:
Unrealized gains/(losses) on securities available-for-sale	$ (2,873)	$ (25,492)	$ (32,774)