Investments in RMBS, Unrealized Loss Positions (Details) $ in Thousands		12 Months Ended
		Dec. 31, 2022 USD ($) Security	Dec. 31, 2021 USD ($) Security
RMBS, Unrealized Loss Positions [Abstract]
Carrying value		$ 931,431	$ 953,496
RMBS [Member]
RMBS, Unrealized Loss Positions [Abstract]
Original face value		1,051,613	1,257,086
Book value		960,418	945,851
Gross unrealized losses		(33,214)	(6,891)
Carrying value	[1]	$ 931,431	$ 953,496
Number of securities | Security		83	121
Weighted average coupon		4.23%	3.06%
Weighted average yield	[2]	4.29%	2.93%
Weighted average maturity		29 years	28 years
RMBS [Member] | Unrealized Loss Positions [Member]
RMBS, Unrealized Loss Positions [Abstract]
Original face value		$ 848,768	$ 619,176
Book value		767,412	617,328
Gross unrealized losses		(33,214)	(6,891)
Carrying value	[1]	$ 734,198	$ 610,437
Number of securities | Security		67	57
Weighted average coupon		4.06%	2.77%
Weighted average yield	[2]	4.10%	2.62%
Weighted average maturity		29 years	29 years
RMBS [Member] | Less than Twelve Months [Member] | Unrealized Loss Positions [Member]
RMBS, Unrealized Loss Positions [Abstract]
Original face value		$ 848,768	$ 612,547
Book value		767,412	611,306
Gross unrealized losses		(33,214)	(6,783)
Carrying value	[1],[3]	$ 734,198	$ 604,523
Number of securities | Security		67	56
Weighted average coupon		4.06%	2.76%
Weighted average yield	[2]	4.10%	2.62%
Weighted average maturity		29 years	29 years
RMBS [Member] | Twelve or More Months [Member] | Unrealized Loss Positions [Member]
RMBS, Unrealized Loss Positions [Abstract]
Original face value			$ 6,629
Book value			6,022
Gross unrealized losses			(108)
Carrying value	[1],[3]		$ 5,914
Number of securities | Security			1
Weighted average coupon			3.00%
Weighted average yield	[2]		2.83%
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.