Note 6 - Goodwill and Intangibles - Core Deposit Intangibles by Reportable Segment (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Core deposit intangible	$ 9,349	$ 11,381	$ 14,970
Core Deposits [Member]
Segment Reporting Information [Line Items]
Core deposit intangible	9,349	11,381	13,466	$ 15,595
CRBT | Core Deposits [Member]
Segment Reporting Information [Line Items]
Core deposit intangible	1,702	2,189	2,684
CSB | Core Deposits [Member]
Segment Reporting Information [Line Items]
Core deposit intangible	2,653	3,305	3,980
SFCB | Core Deposits [Member]
Segment Reporting Information [Line Items]
Core deposit intangible	$ 4,994	$ 5,887	$ 6,802