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BORROWED FUNDS - Short-term borrowings - Additional information (Details) - USD ($)
 9 Months Ended 12 Months Ended
Sep. 30, 2025
Dec. 31, 2024
BORROWED FUNDS    
Short-term borrowings $ 1,489,000 $ 2,488,000
Other Assets [Member]    
BORROWED FUNDS    
Federal Home Loan Bank Stock 6,331,000 6,299,000
Other Correspondent Banks    
BORROWED FUNDS    
Line of Credit Facility, Maximum Borrowing Capacity 75,000,000 75,000,000
Long-term Line of Credit, Total 0 0
Long-term Line of Credit 0 0
Federal Reserve Bank of Philadelphia    
BORROWED FUNDS    
Line of Credit Facility, Current Borrowing Capacity 25,228,000 18,093,000
Long-term Line of Credit, Total 0 0
Long-term Line of Credit 0 0
Investment pledged as collateral $ 26,732,000 $ 18,881,000
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 $ 1,490,000 $ 2,500,000
Short-term borrowings 1,489,000 2,488,000
FHLB-Pittsburgh borrowings    
BORROWED FUNDS    
Short-term borrowings 0 0
Federal Home Loan Bank of Pittsburgh    
BORROWED FUNDS    
Line of Credit Facility, Maximum Borrowing Capacity 973,060,000 938,691,000
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged 1,386,299,000 1,351,770,000
Line of Credit Facility, Remaining Borrowing Capacity 802,213,000 749,999,000
FHLB-Pittsburgh facility included borrowed funds 27,987,000 23,241,000
Federal Home Loan Bank of Pittsburgh | Other Assets [Member]    
BORROWED FUNDS    
Federal Home Loan Bank Stock $ 14,346,000 $ 15,018,000