Derivative Financial Instruments - Offsetting of Derivative Assets - Derivative Liabilities, Financial Liabilities, and Collateral Held by Counterparty (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	$ 8,733,656	$ 3,822,724
Financial instruments	(8,692,756)	(3,769,449)
Net amount of liabilities in the consolidated balance sheet	40,900	53,275
Bank of America, N.A.
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	1,294,213	875,766
Financial instruments	(1,294,213)	(872,148)
Net amount of liabilities in the consolidated balance sheet		3,618
Atlas Securitized Products, L.P.
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	1,938,756	1,210,473
Financial instruments	(1,938,756)	(1,210,473)
Wells Fargo Bank, N.A.
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	795,119	116,275
Financial instruments	(789,305)	(114,647)
Net amount of liabilities in the consolidated balance sheet	5,814	1,628
Royal Bank of Canada
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	785,597	457,743
Financial instruments	(785,597)	(457,743)
JPMorgan Chase Bank, N.A.
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	1,220,822	243,225
Financial instruments	(1,214,559)	(243,225)
Net amount of liabilities in the consolidated balance sheet	6,263
BNP Paribas
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	568,790	185,425
Financial instruments	(568,790)	(185,425)
Citibank, N.A.
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	455,426	174,221
Financial instruments	(455,426)	(174,221)
Barclays Capital
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	258,559	128,488
Financial instruments	(254,750)	(118,667)
Net amount of liabilities in the consolidated balance sheet	3,809	9,821
Santander US Capital Markets LLC
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	282,077
Financial instruments	(282,077)
Goldman Sachs
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	336,894	178,751
Financial instruments	(336,624)	(178,751)
Net amount of liabilities in the consolidated balance sheet	270
Morgan Stanley Bank, N.A.
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	472,659	195,714
Financial instruments	(472,659)	(164,149)
Net amount of liabilities in the consolidated balance sheet		31,565
Nomura Corporate Funding Americas
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	175,000	50,000
Financial instruments	(175,000)	(50,000)
Mizuho Bank, Ltd.
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	125,000
Financial instruments	(125,000)
Others
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	1,363	5,923
Net amount of liabilities in the consolidated balance sheet	1,363	5,923
Interest rate lock commitments
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	23,381	720
Net amount of liabilities in the consolidated balance sheet	$ 23,381	$ 720