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LOANS - Carrying Amount for Purchased Credit Impaired Loans (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Sep. 30, 2021
Carrying Amount for Purchased Credit Impaired Loans [Abstract]    
Total recorded investment $ 1,483 $ 10,241
Commercial Real Estate [Member]    
Carrying Amount for Purchased Credit Impaired Loans [Abstract]    
Total recorded investment 602 8,324
Commercial and Industrial [Member]    
Carrying Amount for Purchased Credit Impaired Loans [Abstract]    
Total recorded investment $ 881 $ 1,917