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Borrowings - Additional Information (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Short-term borrowings    
Short-term borrowings $ 37,346 $ 17,590
Other borrowings 12,400 17,600
Net loans 4,030,342 2,828,002
Total investment securities 646,268 483,876
Discount Window    
Short-term borrowings    
Amount of credit facility used to issue standby letters of credit to collateralize public fund deposits 135,000  
Assets pledged as collateral | Borrow in Custody Program    
Short-term borrowings    
Net loans 539,500 365,800
Assets pledged as collateral | Bank Term Funding Program    
Short-term borrowings    
Total investment securities 25,000 191,000
Assets pledged as collateral | Discount Window    
Short-term borrowings    
Total investment securities 142,800 11
Federal Reserve Bank Discount Window    
Short-term borrowings    
Maximum borrowing capacity 544,800  
Bank Term Funding Program    
Short-term borrowings    
Short-term borrowings 24,936  
Borrow in Custody Program    
Short-term borrowings    
Amount of credit facility used to issue standby letters of credit to collateralize public fund deposits 409,800 246,100
Peoples Bank    
Short-term borrowings    
Maximum borrowing capacity 1,400,000 1,200,000
Outstanding amount in borrowings 112,100 25,000
Amount of credit facility used to issue standby letters of credit to collateralize public fund deposits $ 364,500 $ 345,400