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Employee benefit plans - Additional Information (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jul. 01, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
FNCB |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Remaining period over which the shares/cost will be expensed | 47 months |  |  |  |
Net compensation expense |  | $ 29 |  | $ 57 |
Common stock available for grant as awards |  | 37,302 |  | 37,302 |
2017 Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Salaries and employee benefits expense |  | $ 84 |  | $ 167 |
2023 Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Salaries and employee benefits expense |  | 175 | $ 200 | $ 455 | $ 399
Non-Performance 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 |  |  |  | 39,249 | 23,243
Performance-based restricted stock units | 2023 Plan | Minimum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Shares or units vesting period |  |  |  | 2 years |
Cumulative diluted earnings per share period used for conditions for vesting of performance-based restricted stock units |  |  |  | 2 years |
Average return on equity period used for conditions for vesting of performance-based restricted stock units |  |  |  | 2 years |
Performance-based restricted stock units | 2023 Plan | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
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 |
Performance-based restricted stock units - 2022 | 2023 Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Increase (decrease) in accumulated benefit obligation |  |  |  | $ 491 |
Performance-based restricted stock units - 2024 | 2023 Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Increase (decrease) in accumulated benefit obligation |  |  |  | $ 213 |
Time based restricted stock awards | 2023 Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Granted shares |  |  |  | 17,107 | 8,895
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 10 months 24 days |
Unrecognized compensation expense |  | $ 2,100 |  | $ 2,100 |

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