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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 |

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- Definition Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 926 -SubTopic 20 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=120154696&loc=d3e54445-107959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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