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Fair Value Measurements - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Fair Value Measurements |  |  |  |  |  |  |  |
Mortgage servicing rights valuation write-down | $ 1,100 |  |  |  |  |  |  |
Impaired loans with a specific allowance | 1,539,147 |  | $ 1,539,147 |  | $ 1,521,252 |  |  |
Allowance for credit losses on loans | 23,744 | [1] | 23,744 | [1] | 15,588 | [1] | $ 16,903 | $ 18,113
Impaired financing receivable charge offs |  |  |  |  | 100 |  |  |
Collateral Dependent Impaired Loans |  |  |  |  |  |  |  |
Fair Value Measurements |  |  |  |  |  |  |  |
Impaired loans with a specific allowance | 5,100 |  | 5,100 |  | 17,700 |  |  |
Allowance for credit losses on loans | $ 1,500 |  | 1,500 |  | $ 0 |  |  |
Impaired financing receivable charge offs |  |  | $ 300 |  |  |  |  |
[1] | December 31, 2023 amounts include the impacts of the January 1, 2023 adoption of ASU 2016-13. See Note 2 for details.

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