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Subordinated debt (Details)
$ in Thousands
3 Months Ended
Jul. 01, 2024
USD ($)
item
Jun. 01, 2020
USD ($)
Mar. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Debt Instrument        
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] us-gaap:SecuredOvernightFinancingRateSofrMember      
Junior subordinated debt     $ 8,063 $ 8,039
Interest on junior subordinated debt     186  
Subordinate Notes Due 2030        
Debt Instrument        
Aggregate principal amount   $ 33,000    
Rate of interest for first five years   5.375%    
Duration interest rate in effect   5 years    
Percentage of debt redeemed   100.00%    
Subordinate Notes Due 2030 | Minimum        
Debt Instrument        
Floated interest rate   4.75%    
Number of days notice to redeem debt   10 days    
Junior subordinated debt | FNCB        
Debt Instrument        
Aggregate principal amount $ 10,300      
Fair market value $ 8,000      
Trust preferred securities | FNCB        
Debt Instrument        
Basis spread adjustment 0.26161%      
Percentage of margin 1.67%      
Maximum number of consecutive quarters until which interest payment can be deferred relating to the debt instrument | item 20      
Junior subordinated debt $ 8,100      
Interest on junior subordinated debt     $ 186