Derivative Financial Instruments - Offsetting of Derivative Assets - Derivative Liabilities, Financial Liabilities, and Collateral Held by Counterparty (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	$ 3,808,345	$ 3,026,402
Financial instruments	(3,786,306)	(3,004,690)
Net amount of liabilities in the consolidated balance sheet	22,039	21,712
Atlas Securitized Products, L.P.
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	1,240,174
Financial instruments	(1,240,174)
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	193,076	211,713
Financial instruments	(191,991)	(211,713)
Net amount of liabilities in the consolidated balance sheet	1,085
Bank of America, N.A.
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	932,023	567,745
Financial instruments	(932,023)	(567,745)
Barclays
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	109,809	80,276
Financial instruments	(109,038)	(79,295)
Net amount of liabilities in the consolidated balance sheet	771	981
Citibank, N.A.
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	119,698	94,211
Financial instruments	(118,654)	(94,211)
Net amount of liabilities in the consolidated balance sheet	1,044
Royal Bank of Canada
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	489,378	381,893
Financial instruments	(489,378)	(381,893)
BNP Paribas
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	239,047	300,280
Financial instruments	(239,015)	(300,280)
Net amount of liabilities in the consolidated balance sheet	32
Morgan Stanley Bank, N.A.
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	166,871	114,277
Financial instruments	(166,871)	(114,277)
Wells Fargo Bank, N.A.
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	178,827	228,181
Financial instruments	(178,827)	(221,986)
Net amount of liabilities in the consolidated balance sheet		6,195
Mizuho Securities
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	3,431
Net amount of liabilities in the consolidated balance sheet	3,431
Goldman Sachs
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	122,825	64,486
Financial instruments	(120,335)	(64,486)
Net amount of liabilities in the consolidated balance sheet	2,490
Other
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	2,443	1,731
Net amount of liabilities in the consolidated balance sheet	2,443	1,731
Interest rate lock commitments
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	10,743	10,884
Net amount of liabilities in the consolidated balance sheet	$ 10,743	$ 10,884