Derivatives - Schedule of Interest Rate Hedging Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Interest rate swaps \| Long position \| Not Designated as Hedging Instrument, Economic Hedge
Derivative [Line Items]
Notional Amount	$ (14,090,000)	$ (9,685,000)
Derivative, average fixed interest rate	3.70%	3.66%
Interest rate swaps \| Long position \| Not Designated as Hedging Instrument, Economic Hedge \| 3-5 years
Derivative [Line Items]
Notional Amount	$ (4,375,000)	$ (2,450,000)
Derivative, average fixed interest rate	3.45%	3.42%
Interest rate swaps \| Long position \| Not Designated as Hedging Instrument, Economic Hedge \| 5-7 years
Derivative [Line Items]
Notional Amount	$ (4,060,000)	$ (4,070,000)
Derivative, average fixed interest rate	3.65%	3.66%
Interest rate swaps \| Long position \| Not Designated as Hedging Instrument, Economic Hedge \| 7-10 years
Derivative [Line Items]
Notional Amount	$ (5,065,000)	$ (3,090,000)
Derivative, average fixed interest rate	3.86%	3.87%
Interest rate swaps \| Long position \| Not Designated as Hedging Instrument, Economic Hedge \| 10-15 years
Derivative [Line Items]
Notional Amount	$ 0	$ (75,000)
Derivative, average fixed interest rate	0.00%	3.77%
Interest rate swaps \| Long position \| Not Designated as Hedging Instrument, Economic Hedge \| 15-20 years
Derivative [Line Items]
Notional Amount	$ (590,000)	$ 0
Derivative, average fixed interest rate	4.40%	0.00%
Interest rate swaps \| Short position \| Not Designated as Hedging Instrument, Economic Hedge
Derivative [Line Items]
Notional Amount	$ (14,090,000)	$ (9,685,000)
U.S. Treasury futures \| Short position \| 5-year
Derivative [Line Items]
Notional Amount	(750,000)	(30,000)
U.S. Treasury futures \| Short position \| 10-year
Derivative [Line Items]
Notional Amount	(2,516,500)	(1,475,000)
U.S. Treasury futures \| Short position \| 30-year
Derivative [Line Items]
Notional Amount	(991,800)	(1,153,500)
U.S. Treasury futures \| Short position \| Not Designated as Hedging Instrument, Economic Hedge
Derivative [Line Items]
Notional Amount	$ (4,258,300)	$ (2,658,500)