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Loans Held-for-Sale - Narrative (Details) | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Mar. 31, 2023 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Dec. 31, 2022 USD ($) loan | Dec. 31, 2023 USD ($)
Loans Held-for-Sale, Net |  |  |  |  |  |  |
Sale of loans held-for-sale excluding acquired loans | $ 1,120,000,000 | $ 1,280,000,000 |  | $ 3,340,000,000 | $ 3,620,000,000 |  |
Loans held-for-sale placed on non-accrual status | 0 |  |  | 0 |  |  | $ 0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |  |  |  |  |
Loans Held-for-Sale, Net |  |  |  |  |  |  |
Loans held-for-sale that were 90 days or more past due | $ 0 |  |  | $ 0 |  |  | $ 0
US Government Sponsored-Enterprise Insured Loans |  |  |  |  |  |  |
Loans Held-for-Sale, Net |  |  |  |  |  |  |
Period of loans held for sale sold |  |  |  | 60 days |  |  |
Private Label |  |  |  |  |  |  |
Loans Held-for-Sale, Net |  |  |  |  |  |  |
Period of loans held for sale sold |  |  |  | 180 days |  |  |
Net loss of swaps gain with loans |  |  |  |  |  | $ 5,200,000 |
Number of loans under the loan portfolio | loan |  |  |  |  |  | 7 |
Unpaid principal balance |  |  |  |  |  | $ 129,900,000 |
Net loans carrying value |  |  |  |  |  | $ 116,400,000 |
Gain on sale of loans |  |  | $ 900,000 |  |  |  |

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