Derivative Instruments, Realized Gain (Loss) Related to Derivatives (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Derivative, Gain (Loss) on Derivative, Net [Abstract]
Realized gain (loss) on derivatives, net		$ 33,821	$ 1,363	$ (9,339)
Interest Rate Swaps [Member]
Derivative, Gain (Loss) on Derivative, Net [Abstract]
Periodic interest income		35,000	11,100	3,800
Not Designated as Hedging Instrument [Member] | Realized Gain (Loss) on Derivatives, Net [Member]
Derivative, Gain (Loss) on Derivative, Net [Abstract]
Realized gain (loss) on derivatives, net		(1,166)	(9,751)	(13,152)
Not Designated as Hedging Instrument [Member] | Realized Gain (Loss) on Derivatives, Net [Member] | Interest Rate Swaps [Member]
Derivative, Gain (Loss) on Derivative, Net [Abstract]
Realized gain (loss) on derivatives, net	[1]	(4,896)	(4,794)	(884)
Not Designated as Hedging Instrument [Member] | Realized Gain (Loss) on Derivatives, Net [Member] | Interest Rate Swaptions [Member]
Derivative, Gain (Loss) on Derivative, Net [Abstract]
Realized gain (loss) on derivatives, net		0	(585)	(1,028)
Not Designated as Hedging Instrument [Member] | Realized Gain (Loss) on Derivatives, Net [Member] | TBAs [Member]
Derivative, Gain (Loss) on Derivative, Net [Abstract]
Realized gain (loss) on derivatives, net		13,059	(27,774)	(4,668)
Not Designated as Hedging Instrument [Member] | Realized Gain (Loss) on Derivatives, Net [Member] | Treasury Futures [Member]
Derivative, Gain (Loss) on Derivative, Net [Abstract]
Realized gain (loss) on derivatives, net		(8,992)	23,752	(3,670)
Not Designated as Hedging Instrument [Member] | Realized Gain (Loss) on Derivatives, Net [Member] | U.S. Treasury Futures Options [Member]
Derivative, Gain (Loss) on Derivative, Net [Abstract]
Realized gain (loss) on derivatives, net		$ (337)	$ (350)	$ (2,902)

[1] Excludes interest rate swap periodic interest income of $35.0 million, $11.1 million and $3.8 million, for the years ended December 31, 2023, December 31, 2022 and December 31, 2021, respectively.