Investments in RMBS, Summary (Details) $ in Thousands		9 Months Ended	12 Months Ended
		Sep. 30, 2024 USD ($) Security	Dec. 31, 2023 USD ($) Security
Residential Mortgage-Backed Securities [Abstract]
Carrying value		$ 1,214,123	$ 1,012,130
RMBS [Member]
Residential Mortgage-Backed Securities [Abstract]
Original face value		1,332,600	1,097,720
Book value		1,188,458	1,004,803
Gross unrealized gains		28,140	16,166
Gross unrealized losses		(2,475)	(8,839)
Carrying value	[1]	$ 1,214,123	$ 1,012,130
Number of securities | Security		98	80
Weighted average coupon		4.81%	4.64%
Weighted average yield	[2]	4.93%	4.77%
Weighted average maturity		28 years	28 years
Fannie Mae [Member] | Fair Value through OCI [Member]
Residential Mortgage-Backed Securities [Abstract]
Original face value		$ 188,869	$ 211,773
Book value		158,818	187,746
Gross unrealized gains		3,912	2,970
Gross unrealized losses		(153)	(1,607)
Carrying value	[1],[3]	$ 162,577	$ 189,109
Number of securities | Security		13	15
Weighted average coupon		4.63%	4.55%
Weighted average yield	[2]	4.78%	4.70%
Weighted average maturity		27 years	28 years
Fannie Mae [Member] | Fair Value through Earnings [Member]
Residential Mortgage-Backed Securities [Abstract]
Original face value		$ 305,920	$ 221,965
Book value		278,839	208,487
Gross unrealized gains		7,648	4,606
Gross unrealized losses		(309)	(1,076)
Carrying value	[1],[3]	$ 286,178	$ 212,017
Number of securities | Security		22	17
Weighted average coupon		4.86%	4.78%
Weighted average yield	[2]	4.99%	4.94%
Weighted average maturity		28 years	28 years
Freddie Mac [Member] | Fair Value through OCI [Member]
Residential Mortgage-Backed Securities [Abstract]
Original face value		$ 193,105	$ 262,695
Book value		160,581	235,260
Gross unrealized gains		1,693	1,075
Gross unrealized losses		(1,809)	(4,865)
Carrying value	[1],[3]	$ 160,465	$ 231,470
Number of securities | Security		15	19
Weighted average coupon		4.36%	4.45%
Weighted average yield	[2]	4.45%	4.50%
Weighted average maturity		27 years	28 years
Freddie Mac [Member] | Fair Value through Earnings [Member]
Residential Mortgage-Backed Securities [Abstract]
Original face value		$ 644,706	$ 401,287
Book value		590,220	373,310
Gross unrealized gains		14,887	7,515
Gross unrealized losses		(204)	(1,291)
Carrying value	[1],[3]	$ 604,903	$ 379,534
Number of securities | Security		48	29
Weighted average coupon		4.96%	4.72%
Weighted average yield	[2]	5.06%	4.88%
Weighted average maturity		28 years	29 years

[1] See Note 9 regarding the estimation of fair value, which approximates carrying value for all securities.

[2] The weighted average yield is based on the most recent gross monthly interest income, which is then annualized and divided by the book value of settled securities.

[3] The Company used an implied AAA rating for the Agency RMBS.