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BORROWED FUNDS - Short-term borrowings (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
BORROWED FUNDS AND SUBORDINATED DEBT    
Short-term borrowings $ 1,803 $ 20,022
FHLB-Pittsburgh borrowings    
BORROWED FUNDS AND SUBORDINATED DEBT    
Short-term borrowings 0 18,066
Customer repurchase agreements    
BORROWED FUNDS AND SUBORDINATED DEBT    
Short-term borrowings $ 1,803 $ 1,956