Derivative Instruments, Outstanding Notional Amounts and Interest Rate Swap Agreements of Derivative Instruments (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022
Pay SOFR [Member]
Outstanding Notional Amounts and Interest Rate Swap Agreements [Abstract]
Total notional amount		$ 869,000
Weighted average years to maturity		3 years 9 months 18 days
Fixed interest rate		5.40%
Receive SOFR [Member]
Outstanding Notional Amounts and Interest Rate Swap Agreements [Abstract]
Total notional amount		$ 188,000
Weighted average years to maturity		2 years
Fixed interest rate		5.40%
Pay SOFR/LIBOR [Member]
Outstanding Notional Amounts and Interest Rate Swap Agreements [Abstract]
Total notional amount			$ 1,030,000
Weighted average years to maturity			4 years 8 months 12 days
Fixed interest rate			4.40%
Receive LIBOR [Member]
Outstanding Notional Amounts and Interest Rate Swap Agreements [Abstract]
Total notional amount			$ 275,000
Weighted average years to maturity			6 years 6 months
Fixed interest rate			4.60%
Notional Amount of Interest Rate Swaps [Member]
Outstanding Notional Amounts and Interest Rate Swap Agreements [Abstract]
Total notional amount	[1]	$ 1,057,000	$ 1,305,000
Fair value		$ 16,705	$ 15,748
Weighted average pay rate		1.59%	1.53%
Weighted average receive rate		5.24%	3.96%
Weighted average years to maturity		3 years 6 months	5 years 1 month 6 days
Notional Amount of TBAs, Net [Member]
Outstanding Notional Amounts and Interest Rate Swap Agreements [Abstract]
Total notional amount		$ 376,600	$ 306,100
Fair value		(357,252)	(285,593)
Notional Amount of U.S. Treasury Futures [Member]
Outstanding Notional Amounts and Interest Rate Swap Agreements [Abstract]
Fair value		(1,651)	618
Notional Amount of Options on Treasury Futures [Member]
Outstanding Notional Amounts and Interest Rate Swap Agreements [Abstract]
Fair value			234
Not Designated as Hedging Instrument [Member]
Outstanding Notional Amounts and Interest Rate Swap Agreements [Abstract]
Total notional amount		954,500	930,200
Not Designated as Hedging Instrument [Member] | Notional Amount of Interest Rate Swaps [Member]
Outstanding Notional Amounts and Interest Rate Swap Agreements [Abstract]
Total notional amount		1,057,000	1,305,000
Not Designated as Hedging Instrument [Member] | Notional Amount of TBAs, Net [Member]
Outstanding Notional Amounts and Interest Rate Swap Agreements [Abstract]
Total notional amount		376,600	306,100
Not Designated as Hedging Instrument [Member] | Notional Amount of U.S. Treasury Futures [Member]
Outstanding Notional Amounts and Interest Rate Swap Agreements [Abstract]
Total notional amount		274,100	88,700
Not Designated as Hedging Instrument [Member] | Notional Amount of Options on Treasury Futures [Member]
Outstanding Notional Amounts and Interest Rate Swap Agreements [Abstract]
Total notional amount		$ 0	$ 20,000

[1] Includes $869.0 million notional of receive SOFR and pay fixed of 5.4% and $188.0 million notional of receive fixed of 5.4% and pay SOFR with weighted average maturities of 3.8 years and 2.0 years, respectively, as of December 31, 2023. Includes $1,030.0 million notional of receive SOFR/LIBOR and pay fixed of 4.4% and $275.0 million notional of receive fixed of 4.6% and pay LIBOR with weighted average maturities of 4.7 years and 6.5 years, respectively, as of December 31, 2022.