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Subordinated debt (Details)
$ in Thousands
Jul. 01, 2024
USD ($)
item
Jun. 01, 2020
USD ($)
Sep. 30, 2024
USD ($)
Debt Instrument      
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] us-gaap:SecuredOvernightFinancingRateSofrMember    
Junior subordinated debt     $ 8,015
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%    
Number Of Consecutive | item 20    
Junior subordinated debt $ 8,000