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Commitments and Contingencies - Repurchase Reserve Activity (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Commitment And Contingencies [Line Items]
Beginning balance	$ 92,581	$ 50,860	$ 89,553	$ 49,694	$ 49,694
Provision charged to (released from) operating expense, net			3,725	12,386
Charge-offs	(540)	(253)	(1,218)	(1,338)
Ending balance	93,446	65,623	93,446	65,623	89,553
Mortgage Loans [Member]
Commitment And Contingencies [Line Items]
Beginning balance	1,315	1,878	1,725	2,102	2,102
Provision charged to (released from) operating expense, net		35	(323)	(45)
Charge-offs	(47)	(74)	(134)	(218)
Ending balance	$ 1,268	$ 1,839	$ 1,268	$ 1,839	$ 1,725

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Commitment And Contingencies [Line Items]

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Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
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Amount, excluding accrued interest, of decrease in allowance for credit loss on financing receivable from writeoff. Excludes net investment in lease.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
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Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value.

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