Derivative Activities - Offsetting of Derivative Assets - Derivative Liabilities, Financial Liabilities, and Collateral Held by Counterparty (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	$ 3,026,402	$ 7,319,966
Financial instruments	(3,004,690)	(7,297,360)
Net amount of liabilities in the consolidated balance sheet	21,712	22,606
Credit Suisse First Boston Mortgage Capital LLC
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	970,725	1,974,278
Financial instruments	(968,804)	(1,969,670)
Net amount of liabilities in the consolidated balance sheet	1,921	4,608
JP Morgan
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	211,713	300,912
Financial instruments	(211,713)	(300,912)
Bank of America, N.A.
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	567,745	1,758,690
Financial instruments	(567,745)	(1,758,690)
Barclays
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	80,276	677,419
Financial instruments	(79,295)	(676,685)
Net amount of liabilities in the consolidated balance sheet	981	734
Citibank, N.A.
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	94,211	403,003
Financial instruments	(94,211)	(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	381,893	496,064
Financial instruments	(381,893)	(496,064)
BNP Paribas
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	300,280	349,172
Financial instruments	(300,280)	(349,172)
Morgan Stanley Bank, N.A.
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	114,277	299,580
Financial instruments	(114,277)	(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	228,181	203,779
Financial instruments	(221,986)	(200,338)
Net amount of liabilities in the consolidated balance sheet	6,195	3,441
Goldman Sachs
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	64,486	853,147
Financial instruments	(64,486)	(850,918)
Net amount of liabilities in the consolidated balance sheet		2,229
Other
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	1,731	2,642
Net amount of liabilities in the consolidated balance sheet	1,731	2,642
Interest rate lock commitments
Derivative liabilities:
Net amounts of liabilities presented in the consolidated balance sheet	10,884	1,280
Net amount of liabilities in the consolidated balance sheet	$ 10,884	$ 1,280