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SECURITIES - Narrative (Details)
12 Months Ended 41 Months Ended
Sep. 30, 2021
USD ($)
security
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2021
USD ($)
security
Debt Securities, Available-for-sale [Line Items]        
Number of securities in an unrealized loss position | security 67     67
Securities pledged as collateral for public funds on deposit $ 0 $ 0   $ 0
Securities pledged as collateral for individual, trust, and estate deposits 0 0   0
Equity securities without readily determinable fair value, amount 16,000,000 23,000,000   16,000,000
Federal reserve bank stock 19,700,000 19,700,000   19,700,000
Federal Reserve Bank and Federal Home Loan Bank Stock, at cost 8,700,000 7,500,000   8,700,000
Pledged securities against specific FHLB advances, fair value 644,700,000 673,800,000   644,700,000
Loans pledged as collateral 0 333,800,000   0
Impairment recognized 2,600,000 1,300,000 $ 0  
Marketable        
Debt Securities, Available-for-sale [Line Items]        
Equity securities 12,700,000 3,000,000   12,700,000
Fair value adjustment       7,500,000
Unrealized gains (losses) on marketable equity securities (3,400,000)     4,100,000
Non-marketable        
Debt Securities, Available-for-sale [Line Items]        
Equity securities 4,600,000 2,800,000   4,600,000
Unrealized gains (losses) on marketable equity securities 600,000 0    
Asset Pledged as Collateral        
Debt Securities, Available-for-sale [Line Items]        
Investments 236,100,000 359,700,000   $ 236,100,000
Federal Home Loan Bank        
Debt Securities, Available-for-sale [Line Items]        
Interest and dividend income from FLHB 200,000 800,000 $ 1,000,000  
Federal Reserve Bank        
Debt Securities, Available-for-sale [Line Items]        
Interest and dividend income from FLHB $ 1,500,000 $ 300,000