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LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES - Outstanding principal balance and carrying amount (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Sep. 30, 2023
Components of loans receivable    
Balance $ 125,276  
Balance   $ 126,605
Carrying Amount 123,722 125,427
Carrying Amount   33,166
Acquired    
Components of loans receivable    
Balance   33,166
Acquired | Citizens Bank of Cape Vincent    
Components of loans receivable    
Balance 30,521  
Balance   33,166
Carrying Amount 29,614  
Carrying Amount   32,174
Acquired Non-Credit Impaired Loans | Citizens Bank of Cape Vincent    
Components of loans receivable    
Balance 30,521  
Balance   33,166
Carrying Amount $ 29,614  
Carrying Amount   $ 32,174