Derivative Financial Instruments - Offsetting of Derivative Assets - Derivative Liabilities, Financial Liabilities, and Collateral Held by Counterparty (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	$ 3,615,569	$ 7,319,966
Financial instruments	(3,490,082)	(7,297,360)
Net amount of liabilities in the consolidated balance sheet	125,487	22,606
Credit Suisse First Boston Mortgage Capital LLC
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	1,116,556	1,974,278
Financial instruments	(1,116,343)	(1,969,670)
Net amount of liabilities in the consolidated balance sheet	213	4,608
JP Morgan
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	142,962	300,912
Financial instruments	(139,205)	(300,912)
Net amount of liabilities in the consolidated balance sheet	3,757
Bank of America, N.A.
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	995,818	1,758,690
Financial instruments	(995,818)	(1,758,690)
Barclays
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	184,647	677,419
Financial instruments	(161,390)	(676,685)
Net amount of liabilities in the consolidated balance sheet	23,257	734
Citibank, N.A.
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	157,702	403,003
Financial instruments	(157,702)	(402,806)
Net amount of liabilities in the consolidated balance sheet		197
Royal Bank of Canada
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	198,400	496,064
Financial instruments	(198,400)	(496,064)
BNP Paribas
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	242,282	349,172
Financial instruments	(241,058)	(349,172)
Net amount of liabilities in the consolidated balance sheet	1,224
Morgan Stanley Bank, N.A.
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	269,997	299,580
Financial instruments	(269,997)	(292,105)
Net amount of liabilities in the consolidated balance sheet		7,475
Wells Fargo Bank, N.A.
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	194,706	203,779
Financial instruments	(187,153)	(200,338)
Net amount of liabilities in the consolidated balance sheet	7,553	3,441
Goldman Sachs
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	36,515	853,147
Financial instruments	(23,016)	(850,918)
Net amount of liabilities in the consolidated balance sheet	13,499	2,229
Nomura Securities International, Inc.
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	3,178	273
Net amount of liabilities in the consolidated balance sheet	3,178	273
Bank of Oklahoma
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	3,791	603
Net amount of liabilities in the consolidated balance sheet	3,791	603
Other
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	617	1,766
Net amount of liabilities in the consolidated balance sheet	617	1,766
Interest rate lock commitments
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	68,398	1,280
Net amount of liabilities in the consolidated balance sheet	$ 68,398	$ 1,280