Other Assets - Impact of Derivative Instruments on Earnings (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Derivative [Line Items]
Income on swap variable receive leg	$ 37,784	$ 4,899	$ 71,635	$ 5,306
Expense on swap fixed pay leg	(11,819)	(9,172)	(23,853)	(15,108)
Net price alignment expense on margin collateral received	(2,532)	0	(4,810)	0
Net gain on TBA short positions	0	20,310	0	39,186
Total Net (loss)/gain on derivatives used for risk management purposes	60,451	47,804	39,243	141,905
Agreements with mark-to-market collateral provisions
Derivative [Line Items]
Unrealized mark-to-market (loss)/gain	$ 37,018	$ 31,767	$ (3,729)	$ 112,521