Warehouse Receivables & Warehouse Lines of Credit - Summary of Warehouse Lines of Credit in Place (Details) - USD ($)					12 Months Ended
	Oct. 17, 2022	Jul. 15, 2022	Jun. 27, 2022	May 25, 2022	Dec. 31, 2022	Dec. 31, 2021	Oct. 18, 2021	Jul. 01, 2020
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Carrying Value					$ 447,840,000	$ 1,277,451,000
Revolving credit facility, with interest ranging from 5.03% to 5.23%					178,000,000	0
Warehouse Agreement Borrowings
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Maximum Facility Size					3,600,000,000	3,600,000,000
Carrying Value					$ 447,840,000	1,277,451,000
Warehouse Agreement Borrowings | JP Morgan | daily floating rate SOFR rate plus 1.60%, with a SOFR adjustment rate of 0.05%
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Basis spread on variable rate (percent)					1.60%
Maximum Facility Size					$ 1,335,000,000	1,335,000,000	$ 1,350,000,000
Carrying Value					$ 330,509,000	742,124,000
Warehouse Agreement Borrowings | JP Morgan | daily floating rate SOFR rate plus 1.60%, with a SOFR adjustment rate of 0.05% | Secured Overnight Financing Rate (SOFR) Adjustment
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Basis spread on variable rate (percent)	0.05%				0.05%
Warehouse Agreement Borrowings | JP Morgan | daily floating rate SOFR rate plus 1.60%, with a SOFR adjustment rate of 0.05% | Secured Overnight Financing Rate (SOFR)
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Basis spread on variable rate (percent)	1.60%
Warehouse Agreement Borrowings | JP Morgan | daily floating rate SOFR rate plus 1.60%, with a SOFR adjustment rate of 0.05% | Sublimit Borrowing Agreement
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Basis spread on variable rate (percent)	2.75%
Warehouse Agreement Borrowings | JP Morgan | daily floating rate SOFR rate plus 1.60%, with a SOFR adjustment rate of 0.05% | Sublimit Borrowing Agreement | Secured Overnight Financing Rate (SOFR) Adjustment
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Basis spread on variable rate (percent)	0.05%
Warehouse Agreement Borrowings | JP Morgan | daily floating rate SOFR rate plus 2.75%, with a SOFR adjustment rate of 0.05%
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Basis spread on variable rate (percent)					2.75%
Maximum Facility Size					$ 15,000,000	15,000,000
Carrying Value					$ 0	4,326,000
Warehouse Agreement Borrowings | JP Morgan | daily floating rate SOFR rate plus 2.75%, with a SOFR adjustment rate of 0.05% | Secured Overnight Financing Rate (SOFR) Adjustment
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Basis spread on variable rate (percent)					0.05%
Warehouse Agreement Borrowings | Fannie Mae ASAP Program | daily one-month LIBOR plus 1.45%, with a LIBOR floor of 0.25%
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Basis spread on variable rate (percent)					1.45%
Maximum Facility Size					$ 650,000,000	650,000,000
Carrying Value					$ 0	133,084,000
Warehouse Agreement Borrowings | Fannie Mae ASAP Program | daily one-month LIBOR plus 1.45%, with a LIBOR floor of 0.25% | Minimum
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Basis spread on variable rate (percent)					0.25%
Warehouse Agreement Borrowings | T D Bank | daily floating rate SOFR plus 1.30%, with a SOFR adjustment rate of 0.10%
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Basis spread on variable rate (percent)					1.30%
Maximum Facility Size					$ 800,000,000	800,000,000		$ 400,000,000
Carrying Value					0	217,672,000
Revolving credit facility, with interest ranging from 5.03% to 5.23%					$ 400,000,000
Warehouse Agreement Borrowings | T D Bank | daily floating rate SOFR plus 1.30%, with a SOFR adjustment rate of 0.10% | Secured Overnight Financing Rate (SOFR) Adjustment
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Basis spread on variable rate (percent)		0.10%			0.10%
Warehouse Agreement Borrowings | T D Bank | daily floating rate SOFR plus 1.30%, with a SOFR adjustment rate of 0.10% | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Basis spread on variable rate (percent)		1.30%
Warehouse Agreement Borrowings | Bank Of America | daily floating SOFR rate plus 1.25%, with a SOFR adjustment rate of 0.10%
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Basis spread on variable rate (percent)					1.25%
Maximum Facility Size				$ 350,000,000	$ 350,000,000	350,000,000
Carrying Value					$ 115,206,000	178,600,000
Warehouse Agreement Borrowings | Bank Of America | daily floating SOFR rate plus 1.25%, with a SOFR adjustment rate of 0.10% | Secured Overnight Financing Rate (SOFR) Adjustment
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Basis spread on variable rate (percent)				0.10%	0.10%
Warehouse Agreement Borrowings | Bank Of America | daily floating SOFR rate plus 1.25%, with a SOFR adjustment rate of 0.10% | London Interbank Offered Rate (LIBOR)
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Basis spread on variable rate (percent)				1.25%
Warehouse Agreement Borrowings | Bank Of America | daily floating SOFR rate plus 1.25%, with a SOFR adjustment rate of 0.10% | Sublimit Borrowing Agreement
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Maximum Facility Size				$ 100,000,000
Warehouse Agreement Borrowings | Bank Of America | daily floating SOFR rate plus 1.25%, with a SOFR adjustment rate of 0.10% | Sublimit Borrowing Agreement | Secured Overnight Financing Rate (SOFR) Adjustment
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Basis spread on variable rate (percent)				0.10%
Warehouse Agreement Borrowings | Bank Of America | daily floating SOFR rate plus 1.25%, with a SOFR adjustment rate of 0.10% | Sublimit Borrowing Agreement | Secured Overnight Financing Rate (SOFR)
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Basis spread on variable rate (percent)				1.75%
Warehouse Agreement Borrowings | Bank Of America | daily floating rate SOFR plus 1.25%, with a SOFR adjustment rate of 0.10%
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Basis spread on variable rate (percent)					1.25%
Maximum Facility Size				$ 250,000,000	$ 250,000,000	250,000,000
Carrying Value					$ 0	0
Warehouse Agreement Borrowings | Bank Of America | daily floating rate SOFR plus 1.25%, with a SOFR adjustment rate of 0.10% | Secured Overnight Financing Rate (SOFR) Adjustment
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Basis spread on variable rate (percent)				0.10%	0.10%
Warehouse Agreement Borrowings | Bank Of America | daily floating rate SOFR plus 1.25%, with a SOFR adjustment rate of 0.10% | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Basis spread on variable rate (percent)				1.25%
Warehouse Agreement Borrowings | MUFG Union Bank, N.A. (Union Bank) | daily floating rate SOFR plus 1.30%
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Basis spread on variable rate (percent)					1.30%
Maximum Facility Size			$ 200,000,000		$ 200,000,000	200,000,000
Carrying Value					$ 2,125,000	$ 1,645,000
Warehouse Agreement Borrowings | MUFG Union Bank, N.A. (Union Bank) | daily floating rate SOFR plus 1.30% | Secured Overnight Financing Rate (SOFR)
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]
Basis spread on variable rate (percent)			1.30%