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Note 2 - Acquisitions and Divestitures (Details Textual) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2019 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2018 USD ($)
Goodwill, Ending Balance | $ 129,570 | $ 129,565 | $ 129,565 | $ 92,750
Highlands Bankshares, Inc. [Member] |  |  |  |
Business Combination, Stock Conversion Ratio | 0.2703 |  |  |
Business Combination, Consideration Transferred, Total | $ 86,650 |  |  |
Goodwill, Ending Balance | $ 36,820 |  |  |

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