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Employee benefit plans - Additional Information (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jul. 01, 2024 | Sep. 30, 2024 | Sep. 30, 2024 | Sep. 30, 2023
FNCB |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Remaining period over which the shares/cost will be expensed | 57 months |  |  |
Common stock available for grant as awards |  | 66,298 | 66,298 |
Salaries and employee benefits expense |  | $ 33 |  |
2017 Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Salaries and employee benefits expense |  | 84 | $ 251 |
2023 Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Salaries and employee benefits expense |  | 203 | $ 603 |
Non-Performance-based restricted stock | 2023 Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Shares or units vesting period |  |  | 3 years |
Performance-based restricted stock units | 2023 Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Granted shares |  |  | 23,243 | 18,222
Shares or units vesting period |  |  | 3 years |
Cumulative diluted earnings per share period used for conditions for vesting of performance-based restricted stock units |  |  | 3 years |
Average return on equity period used for conditions for vesting of performance-based restricted stock units |  |  | 3 years |
Time based restricted stock | 2023 Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Granted shares |  |  | 8,895 | 5,206
Restricted Stock | 2017 Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Remaining period over which the shares/cost will be expensed |  |  | 2 years 7 months 6 days |
Unrecognized compensation expense |  | $ 2,100 | $ 2,100 |

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