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Note 6 - Goodwill and Intangibles - Core Deposit Intangibles by Reportable Segment (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Segment Reporting Information [Line Items] |  |  |  |
Core deposit intangible | $ 11,381 | $ 14,970 | $ 17,450 |
Core Deposits [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Core deposit intangible | 11,381 | 13,466 | 15,595 | $ 9,079
CRBT | Core Deposits [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Core deposit intangible | 2,189 | 2,684 | 3,186 |
CSB | Core Deposits [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Core deposit intangible | 3,305 | 3,980 | 4,675 |
SFCB | Core Deposits [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Core deposit intangible | $ 5,887 | $ 6,802 | $ 7,734 |

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