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SECURITIES - Narrative (Details)
$ in Thousands
 3 Months Ended
Dec. 31, 2024
USD ($)
security
Dec. 31, 2023
USD ($)
Sep. 30, 2024
USD ($)
Debt Securities, Available-for-sale [Line Items]      
Proceeds from sales of securities available for sale $ 160,135 $ 0  
AFS number of securities in an unrealized loss position (in securities) | security 163    
Federal reserve bank stock $ 19,700   $ 19,700
Federal home loan bank stock 4,800   16,300
Marketable      
Debt Securities, Available-for-sale [Line Items]      
Equity securities 3,600   3,300
Unrealized gain (loss) (100) 100  
Non-marketable      
Debt Securities, Available-for-sale [Line Items]      
Equity securities 11,900   11,800
Unrealized gain (loss) 300 $ 300  
Equity securities without readily determinable fair value, amount 14,100   $ 13,600
Realized gain on equity securities $ 400    
Number of equity securities sold | security 0