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SUBORDINATED DEBENTURES AND TRUST PREFERRED SECURITIES (Details) - First Midwest Financial Capital Trust I [Member]
 12 Months Ended
Sep. 30, 2015
Period
$ / shares
shares
Sep. 30, 2014
Subsidiary or Equity Method Investee [Line Items]    
Equity method investment, ownership percentage 100.00%  
Issuance of trust preferred securities (in shares) 10,000  
Number of authorized shares of trust preferred securities issued (in 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  
LIBOR [Member]    
Subsidiary or Equity Method Investee [Line Items]    
Basis spread on variable rate 3.75%  
Effective interest rate 4.28% 4.08%
Effective interest rate, maximum 12.50%