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Employee benefit plans - Salaries and Employee Benefits Expense - SERP and Employee Pension Plan (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Jul. 01, 2024
Jun. 22, 2008
Supplemental Executive Retirement Plans ("SERP")          
Defined Benefit Plan Disclosure          
Maximum annual benefit in excess of federal limits (as a percent) 6.00%        
Employee benefit plan liability $ 223 $ 180      
Employee benefit plan expense 43 19 $ 20    
Defined benefit plan accrued liabilities 5,100 3,100   $ 2,000  
Compensation expense 300 400 $ 400    
Supplemental Executive Retirement Plans ("SERP") | FNCB          
Defined Benefit Plan Disclosure          
Defined benefit plan accrued liabilities       $ 2,000  
Compensation expense $ 100        
Pension Benefits          
Defined Benefit Plan Disclosure          
Retirement age period for fixed benefits payable 65 years        
Benefits accrued under employees' pension plan         $ 0
Increase (decrease) in accumulated benefit obligation $ (900) $ 300      
Discount rate, Obligation 5.38% 4.73% 4.93%