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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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