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SHORT-TERM AND LONG-TERM BORROWINGS - Long Term Debt Narrative (Details)
$ / shares in Units, $ in Thousands
 12 Months Ended
Sep. 23, 2023
USD ($)
Sep. 30, 2025
USD ($)
Period
$ / shares
shares
Sep. 30, 2024
USD ($)
Debt Instrument [Line Items]      
Subordinated debentures, net of issuance costs   $ 19,795 $ 19,693
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   $ 19,800  
Crestmark Bancorp, Inc.      
Debt Instrument [Line Items]      
Effective interest rate   7.24%  
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   8.03% 8.43%
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%