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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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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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