Other Assets - Impact of Derivative Instruments on Earnings (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Income on Swaps variable receive leg	$ 54,509	$ 39,383	$ 146,695	$ 110,311
Expense on Swaps fixed pay leg	(42,937)	(23,383)	(113,248)	(63,574)
Unrealized mark-to-market gain/(loss)	172,320	(5,981)	232,241	(66,214)
Net price alignment expense on margin collateral received	(1,527)	(974)	(2,567)	(3,609)
Realized gain/(loss) on terminated Swaps	0	(8,845)	(6,223)	(26,020)
Net gain/(loss) on TBA long positions	(25,542)	0	(24,374)	0
TBA dollar roll income	2,022	0	3,008	0
Total Net gain/(loss) on derivatives	$ 158,845	$ 200	$ 235,532	$ (49,106)

The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.