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Deposits (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
FNCB    
Cash and Cash Equivalents    
Retail deposits $ 1,300.0  
brokered deposits 140.6  
Affiliate company deposits | Assets pledged as collateral    
Cash and Cash Equivalents    
Deposit liabilities uninsured by FDIC $ 2.6  
Retail accounts    
Cash and Cash Equivalents    
Percentage of deposit held 38.60%  
Commercial accounts    
Cash and Cash Equivalents    
Percentage of deposit held 33.30%  
Municipal relationships    
Cash and Cash Equivalents    
Percentage of deposit held 19.70%  
Municipal relationships | Collateralized by letters of credit    
Cash and Cash Equivalents    
Letters of credit pledged as collateral $ 372.5  
Brokered deposits    
Cash and Cash Equivalents    
Percentage of deposit held 8.40%  
Deposit uninsured by FDIC    
Cash and Cash Equivalents    
Deposit liabilities uninsured by FDIC $ 1,600.0 $ 883.5
Percentage of deposit held 33.80% 26.90%