Investments in RMBS, Unrealized Loss Positions (Details) $ in Thousands		9 Months Ended	12 Months Ended
		Sep. 30, 2024 USD ($) Security	Dec. 31, 2023 USD ($) Security
RMBS, Unrealized Loss Positions [Abstract]
Carrying value		$ 1,214,123	$ 1,012,130
RMBS [Member]
RMBS, Unrealized Loss Positions [Abstract]
Original face value		1,332,600	1,097,720
Book value		1,188,458	1,004,803
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
RMBS [Member] | Unrealized Loss Positions [Member]
RMBS, Unrealized Loss Positions [Abstract]
Original face value		$ 116,799	$ 290,139
Book value		95,566	257,666
Gross unrealized losses		(1,962)	(6,472)
Carrying value	[1]	$ 93,604	$ 251,194
Number of securities | Security		8	20
Weighted average coupon		3.68%	4.14%
Weighted average yield	[2]	3.80%	4.21%
Weighted average maturity		27 years	28 years
RMBS [Member] | Less than Twelve Months [Member] | Unrealized Loss Positions [Member]
RMBS, Unrealized Loss Positions [Abstract]
Original face value			$ 126,949
Book value			109,425
Gross unrealized losses			(813)
Carrying value	[1],[3]		$ 108,612
Number of securities | Security			8
Weighted average coupon			4.23%
Weighted average yield	[2]		4.35%
Weighted average maturity			28 years
RMBS [Member] | Twelve or More Months [Member] | Unrealized Loss Positions [Member]
RMBS, Unrealized Loss Positions [Abstract]
Original face value		$ 116,799	$ 163,190
Book value		95,566	148,241
Gross unrealized losses		(1,962)	(5,659)
Carrying value	[1],[3]	$ 93,604	$ 142,582
Number of securities | Security		8	12
Weighted average coupon		3.68%	4.08%
Weighted average yield	[2]	3.80%	4.10%
Weighted average maturity		27 years	28 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.