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Stock plans - Additional Information (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Jul. 01, 2024 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Restricted Stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Weighted average vesting period |  | 3 years 1 month 6 days |  |
Unrecognized compensation expense |  | $ 1.0 |  |
2017 Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Salaries and employee benefits expense |  | $ 0.6 | $ 0.9 | $ 0.5
2023 Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Common stock available for grant as awards |  | 91,865 |  |
Salaries and employee benefits expense |  | $ 0.6 | $ 0.9 | $ 0.5
2023 Plan | Non-Performance restricted stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Shares or units vesting period |  | 3 years | 3 years | 3 years
2023 Plan | Performance-based restricted stock units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Granted shares |  |  | 18,222 |
Shares or units vesting period |  | 3 years | 3 years | 3 years
Cumulative diluted earnings per share period used for conditions for vesting of performance-based restricted stock units |  | 3 years | 3 years | 3 years
Average return on equity period used for conditions for vesting of performance-based restricted stock units |  | 3 years | 3 years | 3 years
2023 Plan | Time based restricted stock awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Granted shares |  | 8,895 |  |
Shares or units awarded |  |  | 5,206 |
FNCB 2023 Equity Incentive Plan | FNCB |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Weighted average vesting period | 57 months |  |  |

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