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Employee Stock Ownership and 401(k) Plan: Narrative (Details)
$ in Thousands
 1 Months Ended 12 Months Ended 156 Months Ended
Jan. 31, 1998
USD ($)
shares
Sep. 30, 2020
USD ($)
component
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2020
shares
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]          
Earned ESOP shares   $ 31 $ 441 $ 882  
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   $ 908 743 379  
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)   18 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     9 53  
Dividends used for debt service     176 291  
ESOP, shares distributed to participants (in shares) | shares         642,302
ESOP, fair value of unallocated shares       551  
Earned ESOP shares     $ 318 $ 823