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Note 6 - Other Assets - Summary of Major Components of Other Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Jun. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | --- | --- | --- | --- | ---
Cash surrender value of life insurance other than BOLI | $ 21,906 |  | $ 19,895 |  |  |
Net deferred tax asset | 46,164 |  | 51,646 |  |  |
Investments in tax credit partnerships | 193,793 |  | 185,424 |  |  |
Swap assets | 619 |  | 12,437 |  |  |
Prepaid assets | 6,530 |  | 6,369 |  |  |
WM&T fees receivable | 5,163 |  | 4,523 |  |  |
Mortgage servicing rights | 10,447 | $ 10,706 | 11,333 | $ 11,908 | $ 12,197 | $ 13,082
Other real estate owned | 190 |  | 10 |  |  |
Other | 16,768 |  | 17,113 |  |  |
Total other assets | $ 301,580 |  | $ 308,750 |  |  |

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