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Employee Stock Ownership and 401(k) Plan ("KSOP") (Details) (USD $)
 1 Months Ended 12 Months Ended 72 Months Ended
Jan. 31, 2008
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Jan. 31, 1998
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]            
ESOP shares earned, net of tax   $ (328,000) $ (271,000) $ (199,000)    
KSOP
            
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]            
Number of components in KSOP   2        
Required service period   1 year        
Employee minimum age requirement   21 years        
Award vesting period   6 years        
ESOP
            
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]            
Dividends used for debt service   120,000 0 0    
ESOP, shares distributed to participants         335,187  
ESOP, loan borrowed from employer           7,930,000
ESOP, shares purchased for plan 1,058,000          
ESOP, interest rate on employer loan   8.50%        
ESOP, interest expense on employer loan   206,000 237,000 266,000    
ESOP, amount outstanding on employer loan   2,183,000        
ESOP, fair value of unallocated shares   1,673,000 1,746,000 1,375,000 1,746,000  
ESOP shares earned, net of tax   242,000 202,000 165,000    
401(k)
            
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]            
401(k), employer safe harbor contribution (percent)   3.00%        
401(k), employer contributions   $ 302,000 $ 289,000 $ 283,000