Note 7 - Other Assets - Summary of Major Components of Other Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021
Cash surrender value of life insurance other than BOLI	$ 16,332	$ 15,496
Net deferred tax asset	47,123	54,145
Investments in tax credit partnerships	13,250	13,969
Swap assets	8,636	10,727
Prepaid assets	4,528	5,721
Trust fees receivable	3,548	3,354
Mortgage servicing rights	14,623	15,219	$ 16,877	$ 4,528
Other real estate owned	677	677
Other	16,601	15,680
Total other assets	$ 125,318	$ 134,988