Derivative Financial Instruments - Offsetting of Derivative Assets - Derivative Liabilities, Financial Liabilities, and Collateral Held by Counterparty (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	$ 6,651,174	$ 3,822,724
Financial instruments	(6,609,703)	(3,769,449)
Net amount of liabilities in the consolidated balance sheet	41,471	53,275
Bank of America, N.A.
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	1,456,536	875,766
Financial instruments	(1,454,936)	(872,148)
Net amount of liabilities in the consolidated balance sheet	1,600	3,618
Atlas Securitized Products, L.P.
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	837,377	1,210,473
Financial instruments	(837,377)	(1,210,473)
Wells Fargo Bank, N.A.
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	802,353	116,275
Financial instruments	(769,487)	(114,647)
Net amount of liabilities in the consolidated balance sheet	32,866	1,628
Royal Bank of Canada
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	706,793	457,743
Financial instruments	(706,793)	(457,743)
JPMorgan Chase Bank, N.A.
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	675,917	243,225
Financial instruments	(675,579)	(243,225)
Net amount of liabilities in the consolidated balance sheet	338
BNP Paribas
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	557,496	185,425
Financial instruments	(557,496)	(185,425)
Citibank, N.A.
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	436,127	174,221
Financial instruments	(436,127)	(174,221)
Barclays Capital
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	310,540	128,488
Financial instruments	(310,540)	(118,667)
Net amount of liabilities in the consolidated balance sheet		9,821
Santander US Capital Markets LLC
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	282,511
Financial instruments	(282,077)
Net amount of liabilities in the consolidated balance sheet	434
Goldman Sachs
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	219,834	178,751
Financial instruments	(219,834)	(178,751)
Morgan Stanley Bank, N.A.
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	209,495	195,714
Financial instruments	(209,457)	(164,149)
Net amount of liabilities in the consolidated balance sheet	38	31,565
Nomura Corporate Funding Americas
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	100,075	50,000
Financial instruments	(100,000)	(50,000)
Net amount of liabilities in the consolidated balance sheet	75
Mizuho Bank, Ltd.
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	50,000
Financial instruments	(50,000)
Ellington Management
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	3,089
Net amount of liabilities in the consolidated balance sheet	3,089
Others
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	809	5,923
Net amount of liabilities in the consolidated balance sheet	809	5,923
Interest rate lock commitments
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	2,222	720
Net amount of liabilities in the consolidated balance sheet	$ 2,222	$ 720