Securities, at Fair Value - Residential Mortgage Securities (Details) - USD ($) $ in Thousands		Mar. 31, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Fair Value	[1]	$ 736,950	$ 746,090
Agency MBS
Debt Securities, Available-for-sale [Line Items]
Principal/ Current Face		546,647	554,300
Purchase Premiums		1,801	1,824
Accretable Purchase Discounts		(493)	(500)
Discount Designated as Credit Reserve		0	0
Gross Amortized Cost		547,955	555,624
Gross Unrealized Gains		2,738	4,355
Gross Unrealized Losses		(3,774)	(835)
Net Unrealized Gain/(Loss)		(1,036)	3,520
Fair Value		546,919	559,144
Other Securities
Debt Securities, Available-for-sale [Line Items]
Principal/ Current Face		192,671	193,102
Purchase Premiums		20,865	19,686
Accretable Purchase Discounts		(5,571)	(5,637)
Discount Designated as Credit Reserve		(40,514)	(40,514)
Gross Amortized Cost		167,451	166,637
Gross Unrealized Gains		22,865	20,437
Gross Unrealized Losses		(285)	(128)
Net Unrealized Gain/(Loss)		22,580	20,309
Fair Value		190,031	186,946
Total residential mortgage securities
Debt Securities, Available-for-sale [Line Items]
Principal/ Current Face		739,318	747,402
Purchase Premiums		22,666	21,510
Accretable Purchase Discounts		(6,064)	(6,137)
Discount Designated as Credit Reserve		(40,514)	(40,514)
Gross Amortized Cost		715,406	722,261
Gross Unrealized Gains		25,603	24,792
Gross Unrealized Losses		(4,059)	(963)
Net Unrealized Gain/(Loss)		21,544	23,829
Fair Value		736,950	746,090
CRT, Fair Value Option
Debt Securities, Available-for-sale [Line Items]
Gross Unrealized Gains		2,800	2,300
Gross Unrealized Losses		0	0
Fair Value		51,700	51,200
Non-Agency MBS
Debt Securities, Available-for-sale [Line Items]
Gross Unrealized Gains		500	500
Gross Unrealized Losses		(300)	(100)
Fair Value		$ 23,600	$ 23,800

[1] See Note 6 for information regarding the Company’s pledged assets.