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SHORT-TERM AND LONG-TERM BORROWINGS - Long Term Debt Narrative (Details)
$ / shares in Units, $ in Thousands
 12 Months Ended
May 15, 2022
USD ($)
Sep. 30, 2023
USD ($)
Period
$ / shares
shares
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Debt Instrument [Line Items]        
Subordinated debentures, net of issuance costs   $ 19,591 $ 20,000  
Public offering   $ 0 $ 20,000 $ 0
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 | First Midwest Financial Capital Trust I        
Debt Instrument [Line Items]        
Equity method investment, ownership percentage   100.00%    
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   9.65% 7.98%  
First Midwest Financial Capital Trust I | Tenor Spread Adjustment        
Debt Instrument [Line Items]        
Basis spread on variable rate   0.42826%    
5.75% Fixed to Floating Rate Subordinated Debt, Due August 15, 2026 | Subordinated debentures        
Debt Instrument [Line Items]        
Subordinated debentures, net of issuance costs $ 75,000 $ 20,000    
Interest rate, stated percentage 5.75%      
Payment of subordinated debt $ 75,000      
Payment of interest $ 1,000      
6 Point 625 Percent Fixed to Floating Rate Subordinated Debt, Due 2032 | Subordinated debentures        
Debt Instrument [Line Items]        
Interest rate, stated percentage   6.625%    
Public offering   $ 20,000    
Maximum | First Midwest Financial Capital Trust I | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate        
Debt Instrument [Line Items]        
Effective interest rate   12.50%    
Crestmark Bancorp, Inc.        
Debt Instrument [Line Items]        
Effective interest rate   8.66%    
Long-term borrowings   $ 3,400    
Debt instrument, term   30 years    
Interest payment deferment period   5 years    
Crestmark Bancorp, Inc. | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate        
Debt Instrument [Line Items]        
Basis spread on variable rate   3.00%    
Crestmark Bancorp, Inc. | Tenor Spread Adjustment        
Debt Instrument [Line Items]        
Basis spread on variable rate   0.26161%