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SECURITIES - Narrative (Details)
 12 Months Ended
Sep. 30, 2023
USD ($)
security
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Debt Securities, Available-for-sale [Line Items]      
Number of securities in an unrealized loss position | security 206    
Securities pledged as collateral for public funds on deposit $ 0 $ 0  
Securities pledged as collateral for individual, trust, and estate deposits 0 0  
Equity securities without readily determinable fair value, amount 16,200,000 18,200,000  
Federal reserve bank stock 19,700,000 19,700,000  
Federal Reserve Bank and Federal Home Loan Bank Stock, at cost 8,500,000 9,100,000  
Loans 4,316,411,000 3,490,358,000  
Impairment recognized 3,300,000 0 $ 2,600,000
Estimated Fair Value      
Debt Securities, Available-for-sale [Line Items]      
Loans and leases 4,223,010,000 3,525,803,000  
Marketable      
Debt Securities, Available-for-sale [Line Items]      
Equity securities 3,400,000 2,900,000  
Non-marketable      
Debt Securities, Available-for-sale [Line Items]      
Equity securities 8,400,000 7,200,000  
Unrealized gains (losses) on marketable equity securities (200,000) 1,100,000  
Realized gains (loss) on marketable equity securities $ 100,000    
Number of Equity Securities Sold | security 2    
Asset Pledged as Collateral      
Debt Securities, Available-for-sale [Line Items]      
Investments $ 773,600,000 924,200,000  
Loans 21,300,000 0  
Asset Pledged as Collateral with Right | Estimated Fair Value | Federal Home Loan Bank Advances [Member]      
Debt Securities, Available-for-sale [Line Items]      
Loans and leases 996,900,000 804,000,000  
Federal Home Loan Bank      
Debt Securities, Available-for-sale [Line Items]      
Interest and dividend income from FLHB 500,000 300,000 200,000
Federal Reserve Bank      
Debt Securities, Available-for-sale [Line Items]      
Interest and dividend income from FLHB $ 1,200,000 $ 1,200,000 $ 1,500,000