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Short-term borrowings - Additional Information (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Short-term borrowings      
Short-term borrowings $ 15,900 $ 17,590 $ 114,930
Maximum borrowing capacity 18,000 18,000  
Outstanding amount in borrowings 0 0  
Net loans 3,951,729 2,828,002  
Total investment securities 606,943 483,876  
FHLB Advances      
Short-term borrowings      
Amount of credit facility used to issue standby letters of credit to collateralize public fund deposits 1,700,000    
Federal Reserve Bank Advances      
Short-term borrowings      
Amount of credit facility used to issue standby letters of credit to collateralize public fund deposits 476,000    
Assets pledged as collateral | FHLB Advances      
Short-term borrowings      
Net loans 2,400,000    
Assets pledged as collateral | Federal Reserve Bank Advances      
Short-term borrowings      
Net loans 624,800    
Assets pledged as collateral | Borrow in Custody Program      
Short-term borrowings      
Net loans   365,800  
Assets pledged as collateral | Bank Term Funding Program      
Short-term borrowings      
Total investment securities 145,500 191,000  
Assets pledged as collateral | Discount Window      
Short-term borrowings      
Total investment securities   11  
Federal Reserve Bank Discount Window      
Short-term borrowings      
Maximum borrowing capacity 621,500    
Borrow in Custody Program      
Short-term borrowings      
Amount of credit facility used to issue standby letters of credit to collateralize public fund deposits   $ 246,100  
Bank      
Short-term borrowings      
Maximum borrowing capacity 1,700,000    
Outstanding amount in borrowings 99,100    
Amount of credit facility used to issue standby letters of credit to collateralize public fund deposits 487,800    
FNCB      
Short-term borrowings      
Short-term borrowings, aggregate 139,700    
FNCB | Bank Term Funding Program advances and FHLB overnight      
Short-term borrowings      
Short-term borrowings, aggregate 25,000    
FNCB | Bank Term Funding Program      
Short-term borrowings      
Short-term borrowings, aggregate $ 24,900