Warehouse Lines of Credit - Amounts Outstanding and Maturity Dates under the Company’s Various Mortgage Funding Arrangements (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Line of Credit Facility [Line Items]
Warehouse lines of credit	$ 409,497	$ 496,481
Warehouse Lines of Credit
Line of Credit Facility [Line Items]
Maximum borrowing capacity	2,800,000	2,800,000
Warehouse lines of credit	409,497	496,481
$200 Million Warehouse Facility, Maturing April 2023 | Warehouse Lines of Credit
Line of Credit Facility [Line Items]
Maximum borrowing capacity	200,000
Warehouse lines of credit	14,071
$35 Million Warehouse Facility, Maturing June 2023 | Warehouse Lines of Credit
Line of Credit Facility [Line Items]
Maximum borrowing capacity	35,000
Warehouse lines of credit	25,566
$450 Million Warehouse Facility, Maturing August 2023 | Warehouse Lines of Credit
Line of Credit Facility [Line Items]
Maximum borrowing capacity	450,000	450,000
Warehouse lines of credit	58,530	149,513
$200 Million Warehouse Facility, Maturing September 2023 | Warehouse Lines of Credit
Line of Credit Facility [Line Items]
Maximum borrowing capacity	200,000	200,000
Warehouse lines of credit	67,249	41,309
$200 Million Warehouse Facility, Maturing September 2023, 2 | Warehouse Lines of Credit
Line of Credit Facility [Line Items]
Maximum borrowing capacity	200,000	200,000
Warehouse lines of credit	21,388	32,011
$1,200 Million Warehouse Facility, Maturing May 2024 | Warehouse Lines of Credit
Line of Credit Facility [Line Items]
Maximum borrowing capacity	1,200,000	1,200,000
Warehouse lines of credit	130,384	113,136
$88.5 million Warehouse Facility | Warehouse Lines of Credit
Line of Credit Facility [Line Items]
Maximum borrowing capacity	88,500	88,500
Warehouse lines of credit	3,929	8,050
$400 million Warehouse Facility(d) | Warehouse Lines of Credit
Line of Credit Facility [Line Items]
Maximum borrowing capacity	400,000	400,000
Warehouse lines of credit	88,380	65,250
Gestation Warehouse Facility | Warehouse Lines of Credit
Line of Credit Facility [Line Items]
Warehouse lines of credit	$ 0	0
$50 Million Warehouse Facility, Maturing March 2023 | Warehouse Lines of Credit
Line of Credit Facility [Line Items]
Maximum borrowing capacity		50,000
Warehouse lines of credit		41,928
$200 Million Warehouse Facility, Maturing March 2023 | Warehouse Lines of Credit
Line of Credit Facility [Line Items]
Maximum borrowing capacity		200,000
Warehouse lines of credit		45,284
Early Funding | Warehouse Lines of Credit
Line of Credit Facility [Line Items]
Warehouse lines of credit		$ 0