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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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