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Employee Stock Ownership and 401(k) Plan: Narrative (Details) $ in Thousands | 1 Months Ended | 12 Months Ended | 144 Months Ended
--- | --- | --- | ---
Jan. 31, 1998 USD ($) shares | Sep. 30, 2019 USD ($) component | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2019 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 |  | $ 743 | $ 379 | $ 358 |
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 | 96 |
Dividends used for debt service |  | 176 | 291 | 293 |
ESOP, shares distributed to participants (in shares) | shares |  |  |  |  | 632,719
ESOP, fair value of unallocated shares |  |  | 551 | 1,658 |
Earned ESOP shares |  | $ 318 | $ 823 | $ 495 |

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- Definition Employee Stock Ownership Plan (ESOP), Debt Structure, Employer Loan, Amount + References No definition available. + Details
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- Definition Employee Stock Ownership Plan (ESOP), Debt Structure, Employer Loan, Interest Expense + References No definition available. + Details
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- Definition Employee Stock Ownership Plan (ESOP), Debt Structure, Employer Loan, Interest Rate + References No definition available. + Details
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