Note 6 - Goodwill and Intangibles - Core Deposit Intangibles by Reportable Segment (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Core deposit intangible	$ 16,759	$ 9,349	$ 11,381
Core Deposits [Member]
Segment Reporting Information [Line Items]
Core deposit intangible	16,759	9,349	11,381	$ 13,466
CRBT | Core Deposits [Member]
Segment Reporting Information [Line Items]
Core deposit intangible	1,225	1,702	2,189
CSB | Core Deposits [Member]
Segment Reporting Information [Line Items]
Core deposit intangible	2,027	2,653	3,305
SFCB. | Core Deposits [Member]
Segment Reporting Information [Line Items]
Core deposit intangible	$ 13,507	$ 4,994	$ 5,887