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Borrowings - Additional Information (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Short-term borrowings    
Net loans $ 2,835,815 $ 2,828,002
Total investment securities 477,810 483,876
Assets pledged as collateral | Borrow in Custody Program    
Short-term borrowings    
Net loans 348,700 365,800
Assets pledged as collateral | Bank Term Funding Program    
Short-term borrowings    
Total investment securities   191,000
Assets pledged as collateral | Discount Window    
Short-term borrowings    
Total investment securities 191,000 11
Federal Reserve Bank Discount Window    
Short-term borrowings    
Maximum borrowing capacity 425,600  
Borrow in Custody Program    
Short-term borrowings    
Amount of credit facility used to issue standby letters of credit to collateralize public fund deposits 251,000 246,100
Discount Window    
Short-term borrowings    
Amount of credit facility used to issue standby letters of credit to collateralize public fund deposits 174,600  
Peoples Bank    
Short-term borrowings    
Maximum borrowing capacity 1,200,000 1,200,000
Outstanding amount in borrowings 25,000 25,000
Amount of credit facility used to issue standby letters of credit to collateralize public fund deposits $ 279,900 $ 345,400