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BORROWED FUNDS - Short-term borrowings - Additional information (Details) - USD ($)
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
BORROWED FUNDS      
Short-term Debt, Weighted Average Interest Rate, at Point in Time 5.23% 4.28%  
Short-term borrowings $ 33,874,000 $ 80,062,000  
Line of Credit Facility, Maximum Month-end Outstanding Amount 120,290,000 90,042,000 $ 17,353,000
Other Assets [Member]      
BORROWED FUNDS      
Federal Home Loan Bank Stock 6,252,000    
Other Correspondent Banks      
BORROWED FUNDS      
Line of Credit Facility, Maximum Borrowing Capacity 75,000,000 95,000,000  
Long-term Line of Credit, Total 0 0  
Federal Reserve Bank of Philadelphia | Collateral Pledged      
BORROWED FUNDS      
Investment pledged as collateral $ 20,829,000 24,113,000  
Other short-term advances      
BORROWED FUNDS      
Short-term borrowings   $ 0  
Customer repurchase agreements      
BORROWED FUNDS      
Debt, Weighted Average Interest Rate 0.10% 0.10%  
Carrying Value of Securities Sold under Repurchase Agreements and Deposits Received for Securities Loaned, Total $ 2,400,000 $ 3,080,000  
Short-term borrowings 2,374,000 3,062,000  
FHLB-Pittsburgh borrowings      
BORROWED FUNDS      
Short-term borrowings 31,500,000 77,000,000  
Federal Home Loan Bank of Pittsburgh      
BORROWED FUNDS      
Line of Credit Facility, Maximum Borrowing Capacity 926,845,000 839,378,000  
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged 1,323,008,000 1,209,179,000  
Line of Credit Facility, Remaining Borrowing Capacity 737,824,000 689,279,000  
Federal Home Loan Bank of Pittsburgh | Other Assets [Member]      
BORROWED FUNDS      
Federal Home Loan Bank Stock 15,214,000 14,168,000  
Federal Home Loan Bank of Pittsburgh | Federal Reserve Bank of Philadelphia      
BORROWED FUNDS      
Line of Credit Facility, Maximum Borrowing Capacity 19,982,000 23,107,000  
Long-term Line of Credit, Total $ 0 $ 0  
Federal Home Loan Bank of Pittsburgh | Overnight Borrowing      
BORROWED FUNDS      
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate 5.68% 4.45%  
Short-term borrowings $ 6,500,000 $ 77,000,000  
Federal Home Loan Bank of Pittsburgh | Federal Home Loan Bank Advances 1      
BORROWED FUNDS      
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate 5.60%    
Federal Home Loan Bank of Pittsburgh | FHLB-Pittsburgh borrowings      
BORROWED FUNDS      
Short-term borrowings $ 25,000,000