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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 |

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