XML 54 R43.htm IDEA: XBRL DOCUMENT v3.23.2
SECURITIES - Narrative (Details)
 9 Months Ended
Jun. 30, 2023
USD ($)
security
Jun. 30, 2022
USD ($)
Sep. 30, 2022
USD ($)
Debt Securities, Available-for-sale [Line Items]      
AFS number of securities in an unrealized loss position (in securities) | security 203    
Federal reserve bank stock $ 19,700,000   $ 19,700,000
Federal home loan bank stock 11,200,000   9,100,000
Impairment recognized 3,200,000 $ 0  
Marketable      
Debt Securities, Available-for-sale [Line Items]      
Equity securities 3,500,000   2,900,000
Unrealized losses on equity securities 200,000 3,800,000  
Non-marketable      
Debt Securities, Available-for-sale [Line Items]      
Equity securities 8,500,000   7,200,000
Unrealized losses on equity securities 100,000    
Unrealized gains on equity securities   $ 600,000  
Equity securities without readily determinable fair value, amount $ 15,800,000   $ 18,200,000