Basis of Presentation and Significant Accounting Policies (Details) - USD ($)		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Investments in RMBS [Abstract]
Sale of RMBS, settled after period end			$ (49,803,000)	$ 0
Purchase of RMBS, settled after period end			78,881,000	0
Cash and Cash Equivalents and Restricted Cash [Abstract]
Restricted cash		$ 16,441,000	8,234,000
Variation margin		75,800,000	99,000,000
Realized gain (loss) on RMBS, net [Abstract]
Gain on RMBS, available-for-sale, measured at fair value through OCI	[1]	0	50,000	5,653,000
Loss on RMBS, available-for-sale, measured at fair value through OCI	[1]	(29,944,000)	(99,744,000)	(5,105,000)
Loss on RMBS measured at fair value through earnings		(6,371,000)	0	0
Realized gain (loss) on RMBS, net		(36,315,000)	(99,694,000)	$ 548,000
MSRs [Member]
Investments in MSRs [Abstract]
Reserve for unrecoverable advances		0	0
Derivatives [Member]
Cash and Cash Equivalents and Restricted Cash [Abstract]
Restricted cash		16,400,000	4,200,000
Repurchase Agreements [Member]
Cash and Cash Equivalents and Restricted Cash [Abstract]
Restricted cash		0	4,100,000
Receivables and Other Assets [Member] | RMBS [Member]
Investments in RMBS [Abstract]
Income receivable		$ 4,000,000	$ 3,300,000

[1] Reclassified from accumulated other comprehensive income into earnings.