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SHORT-TERM AND LONG-TERM BORROWINGS - Long Term Debt Narrative (Details)
$ / shares in Units, $ in Thousands
 12 Months Ended
Sep. 30, 2024
USD ($)
Period
$ / shares
shares
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Debt Instrument [Line Items]      
Proceeds from long-term borrowings $ 0 $ 0 $ 20,000
Subordinated debentures, net of issuance costs 19,693 $ 19,591  
6 Point 625 Percent Fixed to Floating Rate Subordinated Debt, Due 2032 | Subordinated debentures      
Debt Instrument [Line Items]      
Proceeds from long-term borrowings $ 20,000    
Interest rate, stated percentage 6.625%    
5.75% Fixed to Floating Rate Subordinated Debt, Due August 15, 2026 | Subordinated debentures      
Debt Instrument [Line Items]      
Subordinated debentures, net of issuance costs $ 19,700    
Crestmark Bancorp, Inc.      
Debt Instrument [Line Items]      
Effective interest rate 7.85%    
Long-term borrowings $ 3,400    
Debt instrument, term 30 years    
Interest payment deferment period 5 years    
Tenor Spread Adjustment | Crestmark Bancorp, Inc.      
Debt Instrument [Line Items]      
Basis spread on variable rate 0.26161%    
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Crestmark Bancorp, Inc.      
Debt Instrument [Line Items]      
Basis spread on variable rate 3.00%    
First Midwest Financial Capital Trust I      
Debt Instrument [Line Items]      
Issuance of trust preferred securities (in shares) | shares 10,000    
Number of authorized shares of trust preferred securities issued (in shares) | shares 10,310    
Number of consecutive semi-annual periods that interest payments on capital securities may be deferred | Period 10    
Redemption price per capital security (in dollars per share) | $ / shares $ 1,000    
First Midwest Financial Capital Trust I | Tenor Spread Adjustment      
Debt Instrument [Line Items]      
Basis spread on variable rate 0.42826%    
First Midwest Financial Capital Trust I | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate      
Debt Instrument [Line Items]      
Basis spread on variable rate 3.75%    
Effective interest rate 8.43% 9.65%  
First Midwest Financial Capital Trust I | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Maximum      
Debt Instrument [Line Items]      
Effective interest rate 12.50%    
First Midwest Financial Capital Trust I | First Midwest Financial Capital Trust I      
Debt Instrument [Line Items]      
Equity method investment, ownership percentage 100.00%