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Loans Receivable and Allowance for Loan Losses: Past Due Status of Loans (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Sep. 30, 2018
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Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | $ 3,925 |  | $ 2,556 |
Loans receivable, Non-Accrual | 3,033 | [1] | 1,317 | [2]
Loans receivable, Current | 895,225 |  | 735,002 |
Loans receivable | 899,150 |  | 737,558 |
30-59 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 193 |  | 1,223 |
60-89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 699 |  | 16 |
Past Due 90 Days or More and Still Accruing |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 0 |
Mortgage loans, one-to-four family |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 985 |  | 1,102 |
Loans receivable, Non-Accrual | 699 | [1] | 545 | [2]
Loans receivable, Current | 131,676 |  | 114,839 |
Loans receivable | 132,661 |  | 115,941 |
Mortgage loans, one-to-four family | 30-59 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 557 |
Mortgage loans, one-to-four family | 60-89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 286 |  | 0 |
Mortgage loans, one-to-four family | Past Due 90 Days or More and Still Accruing |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 0 |
Mortgage loans, multi-family |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 0 |
Loans receivable, Non-Accrual | 0 | [1] | 0 | [2]
Loans receivable, Current | 76,036 |  | 61,928 |
Loans receivable | 76,036 |  | 61,928 |
Mortgage loans, multi-family | 30-59 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 0 |
Mortgage loans, multi-family | 60-89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 0 |
Mortgage loans, multi-family | Past Due 90 Days or More and Still Accruing |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 0 |
Mortgage loans, commercial |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 1,091 |  | 574 |
Loans receivable, Non-Accrual | 779 | [1] | 0 | [2]
Loans receivable, Current | 418,026 |  | 344,539 |
Loans receivable | 419,117 |  | 345,113 |
Mortgage loans, commercial | 30-59 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 94 |  | 574 |
Mortgage loans, commercial | 60-89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 218 |  | 0 |
Mortgage loans, commercial | Past Due 90 Days or More and Still Accruing |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 0 |
Mortgage loans, construction - custom and owner/builder |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 0 |
Loans receivable, Non-Accrual | 0 | [1] | 0 | [2]
Loans receivable, Current | 75,411 |  | 67,024 |
Loans receivable | 75,411 |  | 67,024 |
Mortgage loans, construction - custom and owner/builder | 30-59 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 0 |
Mortgage loans, construction - custom and owner/builder | 60-89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 0 |
Mortgage loans, construction - custom and owner/builder | Past Due 90 Days or More and Still Accruing |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 0 |
Mortgage loans, construction - speculative one-to-four family |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 0 |
Loans receivable, Non-Accrual | 0 | [1] | 0 | [2]
Loans receivable, Current | 10,779 |  | 7,107 |
Loans receivable | 10,779 |  | 7,107 |
Mortgage loans, construction - speculative one-to-four family | 30-59 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 0 |
Mortgage loans, construction - speculative one-to-four family | 60-89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 0 |
Mortgage loans, construction - speculative one-to-four family | Past Due 90 Days or More and Still Accruing |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 0 |
Mortgage loans, construction - commercial |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 0 |
Loans receivable, Non-Accrual | 0 | [1] | 0 | [2]
Loans receivable, Current | 24,051 |  | 23,440 |
Loans receivable | 24,051 |  | 23,440 |
Mortgage loans, construction - commercial | 30-59 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 0 |
Mortgage loans, construction - commercial | 60-89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 0 |
Mortgage loans, construction - commercial | Past Due 90 Days or More and Still Accruing |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 0 |
Mortgage loans, construction - multi-family |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 0 |
Loans receivable, Non-Accrual | 0 | [1] | 0 | [2]
Loans receivable, Current | 19,256 |  | 5,983 |
Loans receivable | 19,256 |  | 5,983 |
Mortgage loans, construction - multi-family | 30-59 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 0 |
Mortgage loans, construction - multi-family | 60-89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 0 |
Mortgage loans, construction - multi-family | Past Due 90 Days or More and Still Accruing |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 0 |
Mortgage loans - construction - land development |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 0 |
Loans receivable, Non-Accrual | 0 | [1] | 0 | [2]
Loans receivable, Current | 1,803 |  | 1,567 |
Loans receivable | 1,803 |  | 1,567 |
Mortgage loans - construction - land development | 30-59 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 0 |
Mortgage loans - construction - land development | 60-89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 0 |
Mortgage loans - construction - land development | Past Due 90 Days or More and Still Accruing |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 0 |
Mortgage loans, land |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 402 |  | 283 |
Loans receivable, Non-Accrual | 204 | [1] | 243 | [2]
Loans receivable, Current | 30,368 |  | 25,263 |
Loans receivable | 30,770 |  | 25,546 |
Mortgage loans, land | 30-59 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 5 |  | 40 |
Mortgage loans, land | 60-89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 193 |  | 0 |
Mortgage loans, land | Past Due 90 Days or More and Still Accruing |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 0 |
Consumer loans, home equity and second mortgage |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 697 |  | 401 |
Loans receivable, Non-Accrual | 603 | [1] | 359 | [2]
Loans receivable, Current | 39,493 |  | 36,940 |
Loans receivable | 40,190 |  | 37,341 |
Consumer loans, home equity and second mortgage | 30-59 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 94 |  | 42 |
Consumer loans, home equity and second mortgage | 60-89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 0 |
Consumer loans, home equity and second mortgage | Past Due 90 Days or More and Still Accruing |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 0 |
Consumer loans, other |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 23 |  | 26 |
Loans receivable, Non-Accrual | 23 | [1] | 0 | [2]
Loans receivable, Current | 4,289 |  | 3,489 |
Loans receivable | 4,312 |  | 3,515 |
Consumer loans, other | 30-59 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 10 |
Consumer loans, other | 60-89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 16 |
Consumer loans, other | Past Due 90 Days or More and Still Accruing |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 0 |
Commercial business loans |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 727 |  | 170 |
Loans receivable, Non-Accrual | 725 | [1] | 170 | [2]
Loans receivable, Current | 64,037 |  | 42,883 |
Loans receivable | 64,764 |  | 43,053 |
Commercial business loans | 30-59 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 0 |
Commercial business loans | 60-89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 2 |  | 0 |
Commercial business loans | Past Due 90 Days or More and Still Accruing |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | $ 0 |  | $ 0 |
[1] | Includes non-accrual loans past due 90 days or more and other loans classified as non-accrual.
[2] | Includes non-accrual loans past due 90 days or more and other loans classified as non-accrual.

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