Derivative Financial Instruments - Offsetting of Derivative Assets - Derivative Liabilities, Financial Liabilities, and Collateral Held by Counterparty (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	$ 5,817,657	$ 3,026,402
Financial instruments	(5,768,570)	(3,004,690)
Net amount of liabilities in the consolidated balance sheet	49,087	21,712
Atlas Securitized Products, L.P.
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	1,278,581
Financial instruments	(1,278,581)
Credit Suisse First Boston Mortgage Capital LLC
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet		970,725
Financial instruments		(968,804)
Net amount of liabilities in the consolidated balance sheet		1,921
JP Morgan
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	527,497	211,713
Financial instruments	(527,497)	(211,713)
Bank of America, N.A.
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	1,425,327	567,745
Financial instruments	(1,410,218)	(567,745)
Net amount of liabilities in the consolidated balance sheet	15,109
Barclays
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	192,448	80,276
Financial instruments	(188,337)	(79,295)
Net amount of liabilities in the consolidated balance sheet	4,111	981
Citibank, N.A.
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	580,262	94,211
Financial instruments	(580,262)	(94,211)
Royal Bank of Canada
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	422,001	381,893
Financial instruments	(422,001)	(381,893)
BNP Paribas
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	544,384	300,280
Financial instruments	(544,384)	(300,280)
Morgan Stanley Bank, N.A.
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	199,782	114,277
Financial instruments	(190,604)	(114,277)
Net amount of liabilities in the consolidated balance sheet	9,178
Wells Fargo Bank, N.A.
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	481,255	228,181
Financial instruments	(478,854)	(221,986)
Net amount of liabilities in the consolidated balance sheet	2,401	6,195
Mizuho Securities
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	9,123
Net amount of liabilities in the consolidated balance sheet	9,123
Goldman Sachs
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	147,832	64,486
Financial instruments	(147,832)	(64,486)
Other
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	5,370	1,731
Net amount of liabilities in the consolidated balance sheet	5,370	1,731
Interest rate lock commitments
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	3,795	10,884
Net amount of liabilities in the consolidated balance sheet	$ 3,795	$ 10,884