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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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