Note 8 - Other Assets - Summary of Major Components of Other Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash surrender value of life insurance other than BOLI	$ 18,426	$ 16,145
Net deferred tax asset	22,320	14,466
Investments in tax credit related ventures	9,552	6,248
Swap assets	8,374	2,696
Prepaid assets	2,935	2,812
Trust fee receivable	2,192	2,171
Mortgage servicing rights	2,710	1,372	$ 1,022	$ 875
Other real estate owned	281	493
Other	4,575	4,568
Total other assets	$ 71,365	$ 50,971