Note 7 - Other Assets - Summary of Major Components of Other Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020
Cash surrender value of life insurance other than BOLI	$ 15,297		$ 17,875
Net deferred tax asset	41,138		24,340
Investments in tax credit related ventures	14,626		11,084
Swap assets	6,475		3,148
Prepaid assets	4,016		4,469
Trust fees receivable	3,298		2,868
Mortgage servicing rights	16,504	$ 16,877	4,528	$ 4,657	$ 2,865	$ 2,710
Other real estate owned	7,601		7,212
Other	16,967		10,478
Total other assets	$ 125,922		$ 86,002