Warehouse and Other Secured Lines of Credit - Additional Information (Details) - USD ($)	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Sep. 30, 2022
Line of Credit Facility [Line Items]
Outstanding amount	$ 200,000,000	$ 750,000,000
Warehouse Line of Credit
Line of Credit Facility [Line Items]
Outstanding amount	6,681,917,000	4,902,090,000
Warehouse Line of Credit | Line of Credit, ASAP program
Line of Credit Facility [Line Items]
Outstanding amount	0	0
Maximum borrowing capacity	600,000,000
Revolving Credit Facility | MSR Facility | Line of Credit
Line of Credit Facility [Line Items]
Outstanding amount	100,000,000	500,000,000
Maximum borrowing capacity				$ 1,500,000,000
Revolving Credit Facility | GNMA MSR Facility | Line of Credit
Line of Credit Facility [Line Items]
Outstanding amount	$ 100,000,000	$ 250,000,000
Maximum borrowing capacity			$ 500,000,000