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Fair Value Measurements - Mortgage Servicing Rights - Other (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Jun. 30, 2024 | Dec. 31, 2023 | Jun. 30, 2023 | Dec. 31, 2022
Fair Value Measurements |  |  |  |  |  |  |  |
Impaired loans with a specific allowance | $ 1,466,751 |  | $ 1,466,751 |  |  | $ 1,539,147 |  |
Allowance for credit loss | 21,937 | $ 22,462 | 21,937 | $ 22,462 | $ 21,980 | $ 23,744 | $ 22,236 | $ 15,588
Collateral dependent impaired loans |  |  |  |  |  |  |  |
Fair Value Measurements |  |  |  |  |  |  |  |
Impaired loans with a specific allowance | 1,800 | 2,600 | 1,800 | 2,600 |  |  |  |
Allowance for credit loss | 300 | 20 | 300 | 20 |  |  |  |
Impaired financing receivable, charge-offs | $ 400 | $ 3 | $ 2,300 | $ 30 |  |  |  |

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