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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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- Definition Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479344/326-20-45-1 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (a) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 11B -Subparagraph (c)(2) -SubTopic 10 -Topic 310 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-11B Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.11) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483589/942-220-S99-1 + Details
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