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SECURITIES - Narrative (Details)
12 Months Ended
Sep. 30, 2022
USD ($)
security
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Debt Securities, Available-for-sale [Line Items]      
Number of securities in an unrealized loss position | security 195    
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 18,200,000 16,000,000  
Federal reserve bank stock 19,700,000 19,700,000  
Federal Reserve Bank and Federal Home Loan Bank Stock, at cost 9,100,000 8,700,000  
Loans 3,490,358,000 3,541,282,000  
Impairment recognized 0 2,600,000 $ 1,300,000
Estimated Fair Value      
Debt Securities, Available-for-sale [Line Items]      
Loans and leases 3,525,803,000 3,616,646,000  
Marketable      
Debt Securities, Available-for-sale [Line Items]      
Equity securities 2,900,000 12,700,000  
Unrealized gains (losses) on marketable equity securities (3,800,000) (3,400,000)  
Realized gains (loss) on marketable equity securities 300,000    
Non-marketable      
Debt Securities, Available-for-sale [Line Items]      
Equity securities 7,200,000 4,600,000  
Unrealized gains (losses) on marketable equity securities 1,100,000 600,000  
Realized gains (loss) on marketable equity securities (1,700,000)    
Asset Pledged as Collateral      
Debt Securities, Available-for-sale [Line Items]      
Investments 924,200,000 236,100,000  
Loans 0 0  
Asset Pledged as Collateral with Right | Estimated Fair Value | Short-term FHLB advances      
Debt Securities, Available-for-sale [Line Items]      
Loans and leases 804,000,000 644,700,000  
Federal Home Loan Bank      
Debt Securities, Available-for-sale [Line Items]      
Interest and dividend income from FLHB 300,000 200,000 $ 800,000
Federal Reserve Bank      
Debt Securities, Available-for-sale [Line Items]      
Interest and dividend income from FLHB $ 1,200,000 $ 1,500,000