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Warehouse Receivables & Warehouse Lines of Credit - Summary of Warehouse Lines of Credit in Place (Details) - USD ($)				9 Months Ended
	Jul. 16, 2022	Oct. 18, 2021	Jun. 30, 2021	Sep. 30, 2022	Jun. 27, 2022	May 25, 2022	Dec. 31, 2021	Jan. 15, 2021	Jul. 01, 2020
Short-term Debt [Line Items]
Carrying Value				$ 1,176,514,000			$ 1,277,451,000
Revolving credit facility				$ 283,000,000			0
Bank of America (BofA) | Bank of America, Pricing | Secured Overnight Financing Rate (SOFR) Adjustment
Short-term Debt [Line Items]
Variable rate (as a percent)	0.10%			0.10%
Warehouse Agreement Borrowings
Short-term Debt [Line Items]
Maximum Facility Size				$ 3,600,000,000			3,600,000,000
Carrying Value				1,176,514,000			1,277,451,000
Warehouse Agreement Borrowings | JP Morgan | JP Morgan Chase Bank, N.A. (JP Morgan), Pricing
Short-term Debt [Line Items]
Maximum Facility Size		$ 1,335,000,000		1,335,000,000			1,335,000,000
Carrying Value				$ 922,817,000			742,124,000
Variable rate (as a percent)				1.60%
Warehouse Agreement Borrowings | JP Morgan | JP Morgan Chase Bank, N.A. (JP Morgan), Pricing | Secured Overnight Financing Rate (SOFR) Overnight Index Swap
Short-term Debt [Line Items]
Variable rate (as a percent)		0.05%		1.60%
Warehouse Agreement Borrowings | JP Morgan | JP Morgan Chase Bank, N.A. (JP Morgan), Pricing | Secured Overnight Financing Rate (SOFR) Adjustment
Short-term Debt [Line Items]
Variable rate (as a percent)		0.05%		0.05%
Warehouse Agreement Borrowings | JP Morgan | JP Morgan, Pricing
Short-term Debt [Line Items]
Maximum Facility Size				$ 15,000,000			15,000,000
Carrying Value				$ 729,000			4,326,000
Warehouse Agreement Borrowings | JP Morgan | JP Morgan, Pricing | Secured Overnight Financing Rate (SOFR) Overnight Index Swap
Short-term Debt [Line Items]
Variable rate (as a percent)				2.75%
Warehouse Agreement Borrowings | JP Morgan | JP Morgan, Pricing | Secured Overnight Financing Rate (SOFR) Adjustment
Short-term Debt [Line Items]
Variable rate (as a percent)				0.05%
Warehouse Agreement Borrowings | Fannie Mae ASAP Program | Fannie Mae Multifamily ASAP Program, Pricing
Short-term Debt [Line Items]
Maximum Facility Size				$ 650,000,000			650,000,000	$ 650,000,000
Carrying Value				$ 62,715,000			133,084,000
Warehouse Agreement Borrowings | Fannie Mae ASAP Program | Fannie Mae Multifamily ASAP Program, Pricing | London Interbank Offered Rate (LIBOR) | Maximum
Short-term Debt [Line Items]
Variable rate (as a percent)				1.45%
Warehouse Agreement Borrowings | Fannie Mae ASAP Program | Fannie Mae Multifamily ASAP Program, Pricing | London Interbank Offered Rate (LIBOR) | Minimum
Short-term Debt [Line Items]
Variable rate (as a percent)				0.25%
Warehouse Agreement Borrowings | TD Bank | TD Bank, Pricing
Short-term Debt [Line Items]
Maximum Facility Size				$ 800,000,000			800,000,000		$ 400,000,000
Carrying Value				30,753,000			217,672,000
Revolving credit facility				$ 400,000,000
Warehouse Agreement Borrowings | TD Bank | TD Bank, Pricing | Secured Overnight Financing Rate (SOFR) Overnight Index Swap
Short-term Debt [Line Items]
Variable rate (as a percent)				1.30%
Warehouse Agreement Borrowings | TD Bank | TD Bank, Pricing | Secured Overnight Financing Rate (SOFR) Adjustment
Short-term Debt [Line Items]
Variable rate (as a percent)				0.10%
Warehouse Agreement Borrowings | Bank of America (BofA) | Secured Overnight Financing Rate (SOFR) Adjustment
Short-term Debt [Line Items]
Variable rate (as a percent)				0.10%
Warehouse Agreement Borrowings | Bank of America (BofA) | Bank of America, Pricing
Short-term Debt [Line Items]
Maximum Facility Size				$ 350,000,000			350,000,000
Carrying Value				$ 152,280,000			178,600,000
Warehouse Agreement Borrowings | Bank of America (BofA) | Bank of America, Pricing | Secured Overnight Financing Rate (SOFR) Overnight Index Swap
Short-term Debt [Line Items]
Variable rate (as a percent)				1.25%
Warehouse Agreement Borrowings | Bank of America (BofA) | Bank of America, Pricing | Secured Overnight Financing Rate (SOFR) Adjustment
Short-term Debt [Line Items]
Variable rate (as a percent)				0.10%
Warehouse Agreement Borrowings | Bank of America (BofA) | Bank of America, Pricing | London Interbank Offered Rate (LIBOR)
Short-term Debt [Line Items]
Variable rate (as a percent)				1.25%
Warehouse Agreement Borrowings | Bank of America (BofA) | Bank of America, Pricing | Sublimit Borrowing Agreement
Short-term Debt [Line Items]
Maximum Facility Size				$ 100,000,000
Warehouse Agreement Borrowings | Bank of America (BofA) | Bank of America, Sublimit | Sublimit Borrowing Agreement
Short-term Debt [Line Items]
Variable rate (as a percent)				1.75%
Warehouse Agreement Borrowings | Bank of America (BofA) | Bank of America, Sublimit | Sublimit Borrowing Agreement | Minimum
Short-term Debt [Line Items]
Variable rate (as a percent)				0.10%
Warehouse Agreement Borrowings | Bank of America (BofA) | BofA, pricing
Short-term Debt [Line Items]
Maximum Facility Size				$ 250,000,000		$ 250,000,000	250,000,000
Carrying Value				$ 0			0
Warehouse Agreement Borrowings | Bank of America (BofA) | BofA, pricing | Secured Overnight Financing Rate (SOFR) Overnight Index Swap
Short-term Debt [Line Items]
Variable rate (as a percent)			1.25%	1.25%
Warehouse Agreement Borrowings | Bank of America (BofA) | BofA, pricing | Secured Overnight Financing Rate (SOFR) Adjustment
Short-term Debt [Line Items]
Variable rate (as a percent)				0.10%
Warehouse Agreement Borrowings | MUFG Union Bank, N.A. (Union Bank)
Short-term Debt [Line Items]
Maximum Facility Size					$ 200,000,000
Warehouse Agreement Borrowings | MUFG Union Bank, N.A. (Union Bank) | MUFG Union Bank, N.A. (Union Bank), Pricing
Short-term Debt [Line Items]
Maximum Facility Size				$ 200,000,000			200,000,000
Carrying Value				$ 7,220,000			$ 1,645,000
Warehouse Agreement Borrowings | MUFG Union Bank, N.A. (Union Bank) | MUFG Union Bank, N.A. (Union Bank), Pricing | Secured Overnight Financing Rate (SOFR) Overnight Index Swap
Short-term Debt [Line Items]
Variable rate (as a percent)	1.30%			1.30%
Warehouse Agreement Borrowings | MUFG Union Bank, N.A. (Union Bank) | MUFG Union Bank, N.A. (Union Bank), Pricing | Secured Overnight Financing Rate (SOFR)
Short-term Debt [Line Items]
Variable rate (as a percent)				1.30%

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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The carrying value as of the balance sheet date of the current portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Carrying value as of the balance sheet date of the outstanding short-term borrowings under a revolving line of credit used by mortgage bankers to finance the origination or purchase of loans.

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