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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Other (Details)
 6 Months Ended
Dec. 31, 2023
USD ($)
Office
Sep. 30, 2023
USD ($)
Jul. 01, 2023
USD ($)
Jun. 30, 2023
USD ($)
Impact of Recent Accounting Pronouncements        
Allowance for credit losses $ 21,362,000 $ 21,069,000    
Reserve for unfunded loan commitments 1,681,000 $ 1,458,000    
Retained earnings $ 180,156,000     $ 173,038,000
Nature of Operations and Principals of Consolidation        
Number of offices in Capital Region of New York | Office 23      
Cumulative effect of change in accounting principle - Current Expected Credit Losses        
Impact of Recent Accounting Pronouncements        
Allowance for credit losses     $ (2,300,000)  
Reserve for unfunded loan commitments     1,600,000 $ 1,624,000
Retained earnings     507,000  
Deferred income taxes     $ (180,000)