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Loans Receivable and Allowance for Loan Losses: Past Due Status of Loans (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Sep. 30, 2019
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Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | $ 3,748 |  | $ 3,925 |
Loans receivable, Non-Accrual | 2,905 | [1] | 3,033 | [2]
Loans receivable, Current | 1,029,977 |  | 895,225 |
Loans receivable | 1,033,725 |  | 899,150 |
30-59 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 52 |  | 193 |
60-89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 791 |  | 699 |
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 | 727 |  | 985 |
Loans receivable, Non-Accrual | 659 | [1] | 699 | [2]
Loans receivable, Current | 117,853 |  | 131,676 |
Loans receivable | 118,580 |  | 132,661 |
Mortgage loans, one-to-four family | 30-59 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 0 |
Mortgage loans, one-to-four family | 60-89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 68 |  | 286 |
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 | 85,053 |  | 76,036 |
Loans receivable | 85,053 |  | 76,036 |
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 | 1,377 |  | 1,091 |
Loans receivable, Non-Accrual | 858 | [1] | 779 | [2]
Loans receivable, Current | 452,197 |  | 418,026 |
Loans receivable | 453,574 |  | 419,117 |
Mortgage loans, commercial | 30-59 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 94 |
Mortgage loans, commercial | 60-89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 519 |  | 218 |
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 | 75,332 |  | 75,411 |
Loans receivable | 75,332 |  | 75,411 |
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 | 7,108 |  | 10,779 |
Loans receivable | 7,108 |  | 10,779 |
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 | 20,927 |  | 24,051 |
Loans receivable | 20,927 |  | 24,051 |
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 | 10,832 |  | 19,256 |
Loans receivable | 10,832 |  | 19,256 |
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 | 38 |  | 0 |
Loans receivable, Non-Accrual | 0 | [1] | 0 | [2]
Loans receivable, Current | 4,701 |  | 1,803 |
Loans receivable | 4,739 |  | 1,803 |
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 | 38 |  | 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 | 538 |  | 402 |
Loans receivable, Non-Accrual | 394 | [1] | 204 | [2]
Loans receivable, Current | 25,033 |  | 30,368 |
Loans receivable | 25,571 |  | 30,770 |
Mortgage loans, land | 30-59 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 5 |
Mortgage loans, land | 60-89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 144 |  | 193 |
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 | 577 |  | 697 |
Loans receivable, Non-Accrual | 555 | [1] | 603 | [2]
Loans receivable, Current | 31,500 |  | 39,493 |
Loans receivable | 32,077 |  | 40,190 |
Consumer loans, home equity and second mortgage | 30-59 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 94 |
Consumer loans, home equity and second mortgage | 60-89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 22 |  | 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 | 12 |  | 23 |
Loans receivable, Non-Accrual | 9 | [1] | 23 | [2]
Loans receivable, Current | 3,560 |  | 4,289 |
Loans receivable | 3,572 |  | 4,312 |
Consumer loans, other | 30-59 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 3 |  | 0 |
Consumer loans, other | 60-89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 0 |
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 | 479 |  | 727 |
Loans receivable, Non-Accrual | 430 | [1] | 725 | [2]
Loans receivable, Current | 69,061 |  | 64,037 |
Loans receivable | 69,540 |  | 64,764 |
Commercial business loans | 30-59 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 49 |  | 0 |
Commercial business loans | 60-89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 2 |
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 |
SBA PPP Loans |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  |  |
Loans receivable, Non-Accrual | 0 |  |  |
Loans receivable, Current | 126,820 |  |  |
Loans receivable | 126,820 |  |  |
SBA PPP Loans | 30-59 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  |  |
SBA PPP Loans | 60-89 Days Past Due |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  |  |
SBA PPP Loans | Past Due 90 Days or More and Still Accruing |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | $ 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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