Note 9 - Other Assets - Summary of Major Components of Other Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash surrender value of life insurance other than BOLI	$ 17,843	$ 15,496
Net deferred tax asset	47,236	54,145
Investments in tax credit partnerships	175,056	13,969
Swap assets	5,133	10,727
Prepaid assets	5,873	5,721
WM&T fees receivable	4,205	3,354
Mortgage servicing rights	13,082	15,219	$ 4,528	$ 2,710
Other real estate owned	10	677
Other	18,922	15,680
Total other assets	$ 287,360	$ 134,988