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Summary of significant accounting policies - Pending Merger (Details) - Pending Merger with FNCB Bancorp, Inc. | Jun. 28, 2024 USD ($) $ / shares | Sep. 27, 2023
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Business Acquisition |  |
Fixed exchange ratio |  | 0.1460
Common stock shares | $ | $ 2,935,456 |
Share price (in dollars per share) | $ / shares | $ 45.54 |

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