Investments in RMBS, Assets by Maturity (Details) $ in Thousands		12 Months Ended
		Dec. 31, 2023 USD ($) Security	Dec. 31, 2022 USD ($) Security
RMBS, Assets by Maturity [Abstract]
Carrying value		$ 1,012,130	$ 931,431
Carrying value of collateral for repurchase agreements		973,221	815,171
RMBS [Member]
RMBS, Assets by Maturity [Abstract]
Original face value		1,097,720	1,051,613
Book value		1,004,803	960,418
Gross unrealized gains		16,166	4,227
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
Carrying value of collateral for repurchase agreements		$ 973,200	$ 815,200
Allowance for credit losses		0	0
Impairment charges		0	0
RMBS [Member] | Fair Value through OCI [Member] | Over 10 Years [Member]
RMBS, Assets by Maturity [Abstract]
Original face value		474,467	1,051,613
Book value		423,007	960,418
Gross unrealized gains		4,045	4,227
Gross unrealized losses		(6,472)	(33,214)
Carrying value	[1],[3]	$ 420,579	$ 931,431
Number of securities | Security		34	83
Weighted average coupon		4.49%	4.23%
Weighted average yield	[2]	4.59%	4.29%
Weighted average maturity		28 years	29 years
RMBS [Member] | Fair Value through Earnings [Member] | Over 10 Years [Member]
RMBS, Assets by Maturity [Abstract]
Original face value		$ 623,253
Book value		581,796
Gross unrealized gains		12,121
Gross unrealized losses		(2,367)
Carrying value	[1],[3]	$ 591,551
Number of securities | Security		46
Weighted average coupon		4.74%
Weighted average yield	[2]	4.90%
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.