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Employee Stock Ownership and 401(k) Plan: Narrative (Details)
$ in Thousands
 1 Months Ended 12 Months Ended 108 Months Ended
Jan. 31, 1998
USD ($)
shares
Sep. 30, 2017
USD ($)
component
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
shares
401(k)          
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]          
401(k), employer safe harbor contribution (as a percent)   3.00%      
401(k), employer contributions   $ 358 $ 333 $ 313  
KSOP          
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]          
Number of components in KSOP | component   2      
Required service period (in years)   1 year      
Employee minimum age requirement (in years)   21 years      
Award vesting period (in years)   6 years      
ESOP          
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]          
ESOP, loan borrowed from employer $ 7,930        
ESOP, shares purchased for plan (in shares) | shares 1,058,000        
ESOP, interest rate on employer loan (as a percent)   8.50%      
ESOP, interest expense on employer loan   $ 96 136 173  
ESOP, amount outstanding on employer loan   821      
Dividends used for debt service   293 243 170  
ESOP, shares distributed to participants (in shares) | shares         515,430
ESOP, fair value of unallocated shares   1,658 1,389 1,344 $ 1,389
Earned ESOP shares   $ 495 $ 233 $ 203