Derivative Instruments - Narrative (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2024 USD ($) contract	Sep. 30, 2024 USD ($)	Jun. 30, 2024 USD ($)	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Sep. 30, 2023 USD ($)	Jun. 30, 2023 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2024 USD ($) contract swap	Dec. 31, 2023 USD ($) contract swap	Dec. 31, 2022 USD ($)
Derivative [Line Items]
Realized gains (losses) on derivatives	$ 641	$ (4,864)	$ (17,317)	$ 0	$ 0	$ 0	$ (6,822)	$ (34,134)	$ (21,540)	$ (40,957)	$ (561)
Notional amount	$ 2,200,000				2,500,000				$ 2,200,000	2,500,000
Number of short contracts | contract	1,000								1,000
Future
Derivative [Line Items]
Realized gains (losses) on derivatives									$ (4,223)	(6,344)	0
Future | 5 Year U.S. Treasury Future, Number One
Derivative [Line Items]
Notional amount	$ 139,000								$ 139,000
Derivative contracts entered into during period | contract									1,391
Length of contract									5 years
Future | 5 Year U.S. Treasury Future, Number Two
Derivative [Line Items]
Notional amount	$ 168,000								$ 168,000
Derivative contracts entered into during period | contract									1,684
Length of contract									5 years
Future | 5 Year U.S. Treasury Future
Derivative [Line Items]
Realized gains (losses) on derivatives									$ (4,900)
Notional amount					600,000					$ 600,000
Derivative contracts entered into during period | contract										6,000
Length of contract										5 years
Future | 2 Year U.S. Treasury Future
Derivative [Line Items]
Realized gains (losses) on derivatives									$ 641
Notional amount					$ 375,000					$ 375,000
Derivative contracts entered into during period | contract										1,875
Length of contract									2 years	2 years
Interest Rate Swaps
Derivative [Line Items]
Derivative weighted average pay rate	3.56%				3.26%				3.56%	3.26%
Derivative weighted average receive rate	4.49%				5.40%				4.49%	5.40%
Derivative remaining maturity	1 year				1 year				1 year	1 year
Number of derivative contracts terminated | swap									0
Realized gains (losses) on derivatives									$ (17,317)	$ (45,226)	(561)
Derivative, contracts matured during period | swap									1
Payments to terminate derivatives										45,000
Derivative, notional amount of derivative terminated										2,500,000
Notional amount	$ 1,500,000				$ 1,000,000				$ 1,500,000	$ 1,000,000
Interest Rate Swaps | Three Swaptions, 3 years, 3.56% strike rate
Derivative [Line Items]
Notional amount	$ 500,000								$ 500,000
Derivative contracts entered into during period | contract									3
Length of contract									1 year
Derivative interest rate	3.56%								3.56%
Swaptions
Derivative [Line Items]
Number of derivative contracts terminated | contract										3
Realized gains (losses) on derivatives									$ 0	$ 10,613	$ 0
Derivative, notional amount of derivative terminated										1,000,000
Notional amount	$ 500,000				$ 1,500,000				$ 500,000	$ 1,500,000
Derivative contracts entered into during period | swap										3
Length of contract										1 year
Derivative interest rate					3.56%					3.56%
Strike rate					3.56%					3.56%
Amount of derivative contracts entered into and terminated										$ 2,300,000
Swaptions | Three Swaptions, 3 years, 3.56% strike rate
Derivative [Line Items]
Derivative contracts exercised | contract									3
Notional amount	$ 500,000				$ 1,500,000				$ 500,000	1,500,000
Call Option
Derivative [Line Items]
Realized gains (losses) on derivatives										$ (187)
Derivative contracts entered into during period | contract										400
Call Option | 5 Year U.S. Treasury Future
Derivative [Line Items]
Length of contract										5 years
Call Option | 2 Year U.S. Treasury Future
Derivative [Line Items]
Length of contract										2 years