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SECURITIES - Narrative (Details)
 12 Months Ended
Sep. 30, 2025
USD ($)
security
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Debt Securities, Available-for-sale [Line Items]      
Proceeds from sales of securities available for sale $ 239,322,000 $ 0 $ 0
Number of securities in an unrealized loss position | security 147    
Securities pledged as collateral for public funds on deposit $ 0 0  
Securities pledged as collateral for individual, trust, and estate deposits 0 0  
Federal reserve bank stock 19,700,000 19,700,000  
Federal Reserve Bank and Federal Home Loan Bank Stock, at cost 5,000,000.0 16,300,000  
Total loans and leases, net 4,611,589,000 4,003,430,000  
Determinable fair value 12,000,000.0 13,600,000  
Impairment recognized 3,000,000.0 1,000,000.0 3,300,000
Marketable      
Debt Securities, Available-for-sale [Line Items]      
Equity securities 3,800,000 3,300,000  
Unrealized loss 100,000 100,000  
Non-marketable      
Debt Securities, Available-for-sale [Line Items]      
Equity securities 13,200,000 11,800,000  
Unrealized gains (losses) on marketable equity securities 1,600,000 1,100,000  
Realized gains on marketable equity securities $ 400,000    
Number of equity securities sold | security 1    
Non-marketable | Visa Class C Common Stock and Visa Class B-2 Common Stock      
Debt Securities, Available-for-sale [Line Items]      
Realized gains on marketable equity securities $ 400,000 2,400,000  
Estimated Fair Value      
Debt Securities, Available-for-sale [Line Items]      
Fair value 4,599,269,000 4,036,490,000  
Federal Reserve Bank      
Debt Securities, Available-for-sale [Line Items]      
Interest and dividend income from FLHB 1,200,000 1,200,000 1,200,000
Federal Home Loan Bank      
Debt Securities, Available-for-sale [Line Items]      
Interest and dividend income from FLHB 600,000 700,000 $ 500,000
Asset Pledged as Collateral      
Debt Securities, Available-for-sale [Line Items]      
Investments 385,500,000 533,800,000  
Total loans and leases, net 223,000,000.0 136,900,000  
Asset Pledged as Collateral with Right | Estimated Fair Value | Federal Home Loan Bank Advances      
Debt Securities, Available-for-sale [Line Items]      
Fair value $ 955,300,000 $ 1,040,000,000.00