Note 6 - Other Assets - Summary of Major Components of Other Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024	Dec. 31, 2023
Cash surrender value of life insurance other than BOLI	$ 19,718	$ 19,895
Net deferred tax asset	47,351	51,646
Investments in tax credit partnerships	197,011	185,424
Swap assets	5,290	12,437
Prepaid assets	6,071	6,369
WM&T fees receivable	4,768	4,523
Mortgage servicing rights	10,817	11,333	$ 12,544	$ 13,082
Other real estate owned	85	10
Other	18,758	17,113
Total other assets	$ 309,869	$ 308,750