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Employee Stock Ownership and 401(k) Plan ("KSOP") (Details)
 1 Months Ended 12 Months Ended 72 Months Ended
Jan. 31, 2008
shares
Sep. 30, 2015
USD ($)
component
Sep. 30, 2014
USD ($)
Sep. 30, 2013
USD ($)
Sep. 30, 2013
USD ($)
shares
Jan. 31, 1998
USD ($)
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]            
Earned ESOP shares   $ 336,000 $ 328,000 $ 271,000    
KSOP            
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]            
Number of components in KSOP | component   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   $ 170,000 72,000 0    
ESOP, shares distributed to participants | shares         379,819  
ESOP, loan borrowed from employer           $ 7,930,000
ESOP, shares purchased for plan | shares 1,058,000          
ESOP, interest rate on employer loan   8.50%        
ESOP, interest expense on employer loan   $ 173,000 206,000 237,000    
ESOP, amount outstanding on employer loan   1,766,000        
ESOP, fair value of unallocated shares   1,344,000 1,673,000 1,746,000 $ 1,746,000  
Earned ESOP shares   $ 203,000 242,000 202,000    
401(k)            
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]            
401(k), employer safe harbor contribution (percent)   3.00%        
401(k), employer contributions   $ 313,000 $ 302,000 $ 289,000