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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, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Commitment And Contingencies [Line Items]
Beginning balance	$ 96,457	$ 92,581	$ 97,947	$ 89,553	$ 89,553
Provision released from operating expense, net			4,776	3,725
Charge-offs	(3,505)	(540)	(8,387)	(1,218)	(1,575)
Ending balance	95,047	93,446	95,047	93,446	97,947
Mortgage loans
Commitment And Contingencies [Line Items]
Beginning balance	1,089	1,315	1,198	1,725	1,725
Provision released from operating expense, net			(73)	(323)
Charge-offs	(20)	(47)	(56)	(134)
Ending balance	$ 1,069	$ 1,268	$ 1,069	$ 1,268	$ 1,198

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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
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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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