v3.26.1
Subordinated debt (Details)
$ in Thousands
3 Months Ended
Jun. 30, 2025
USD ($)
item
Jun. 06, 2025
USD ($)
Jun. 01, 2025
Jun. 01, 2020
Mar. 31, 2026
USD ($)
Mar. 31, 2025
USD ($)
Dec. 31, 2025
USD ($)
Debt Instrument              
Subordinated debt         $ 83,289   $ 83,187
Unamortized debt issuance costs         1,700   1,800
Interest expense on subordinated debt         1,749 $ 443  
Junior subordinated debt         8,167   8,140
Interest on junior subordinated debt         173 186  
Subordinate Notes Due 2030              
Debt Instrument              
Aggregate principal amount $ 33,000            
Interest rate 5.375%     5.375%      
Duration interest rate in effect       5 years      
Floated interest rate     9.08%        
Junior subordinated debt | FNCB              
Debt Instrument              
Aggregate principal amount $ 10,300            
Fair market value $ 8,000            
Trust preferred securities | FNCB              
Debt Instrument              
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] us-gaap:SecuredOvernightFinancingRateSofrMember            
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         8,200   $ 8,100
Interest on junior subordinated debt         $ 173 $ 186  
Subordinate Notes Due 2035              
Debt Instrument              
Aggregate principal amount   $ 85,000          
Interest rate   7.75%          
Percentage of debt redeemed   100.00%          
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]   us-gaap:SecuredOvernightFinancingRateSofrMember          
Basis points added to the reference rate to compute the variable rate on the debt instrument   411          
From and including June 15, 2030, to but excluding the maturity date | Subordinate Notes Due 2035              
Debt Instrument              
Interest rate   7.75%