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SECURITIES - Narrative (Details)
 3 Months Ended 9 Months Ended
Jun. 30, 2024
USD ($)
security
Jun. 30, 2024
USD ($)
security
Jun. 30, 2023
USD ($)
Sep. 30, 2023
USD ($)
Debt Securities, Available-for-sale [Line Items]        
AFS number of securities in an unrealized loss position (in securities) | security 193 193    
Federal reserve bank stock $ 19,700,000 $ 19,700,000   $ 19,700,000
Federal home loan bank stock 4,800,000 4,800,000   8,500,000
Impairment recognized   1,000,000 $ 3,200,000  
Marketable        
Debt Securities, Available-for-sale [Line Items]        
Equity securities 4,300,000 4,300,000   3,400,000
Unrealized losses on equity securities   200,000 200,000  
Non-marketable        
Debt Securities, Available-for-sale [Line Items]        
Equity securities 10,500,000 10,500,000   8,400,000
Unrealized losses on equity securities   600,000    
Unrealized gains on equity securities   2,500,000 $ 100,000  
Equity securities without readily determinable fair value, amount 13,800,000 $ 13,800,000   $ 16,200,000
Realized gain on equity securities $ 2,400,000      
Number of equity securities sold | security   1