Investments in RMBS, Unrealized Loss Positions (Details) $ in Thousands		12 Months Ended
		Dec. 31, 2023 USD ($) Security	Dec. 31, 2022 USD ($) Security
RMBS, Unrealized Loss Positions [Abstract]
Carrying value		$ 1,012,130	$ 931,431
RMBS [Member]
RMBS, Unrealized Loss Positions [Abstract]
Original face value		1,097,720	1,051,613
Book value		1,004,803	960,418
Gross unrealized losses		(8,839)	(33,214)
Carrying value	[1]	$ 1,012,130	$ 931,431
Number of securities | Security		80	83
Weighted average coupon		4.64%	4.23%
Weighted average yield	[2]	4.77%	4.29%
Weighted average maturity		28 years	29 years
RMBS [Member] | Unrealized Loss Positions [Member]
RMBS, Unrealized Loss Positions [Abstract]
Original face value		$ 290,139	$ 848,768
Book value		257,666	767,412
Gross unrealized losses		(6,472)	(33,214)
Carrying value	[1]	$ 251,194	$ 734,198
Number of securities | Security		20	67
Weighted average coupon		4.14%	4.06%
Weighted average yield	[2]	4.21%	4.10%
Weighted average maturity		28 years	29 years
RMBS [Member] | Less than Twelve Months [Member] | Unrealized Loss Positions [Member]
RMBS, Unrealized Loss Positions [Abstract]
Original face value		$ 126,949	$ 848,768
Book value		109,425	767,412
Gross unrealized losses		(813)	(33,214)
Carrying value	[1],[3]	$ 108,612	$ 734,198
Number of securities | Security		8	67
Weighted average coupon		4.23%	4.06%
Weighted average yield	[2]	4.35%	4.10%
Weighted average maturity		28 years	29 years
RMBS [Member] | Twelve or More Months [Member] | Unrealized Loss Positions [Member]
RMBS, Unrealized Loss Positions [Abstract]
Original face value		$ 163,190
Book value		148,241
Gross unrealized losses		(5,659)
Carrying value	[1],[3]	$ 142,582
Number of securities | Security		12
Weighted average coupon		4.08%
Weighted average yield	[2]	4.10%
Weighted average maturity		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.