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Loans Receivable and Allowance for Loan Losses: Past Due Status of Loans (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Sep. 30, 2016
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Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | $ 2,413 |  | $ 3,471 |
Loans receivable, Non-Accrual | 1,911 | [1] | 2,873 | [2]
Loans receivable, Current | 699,970 |  | 671,730 |
Loans receivable | 702,383 |  | 675,201 |
30-59 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 395 |  | 218 |
60-89 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 107 |  | 245 |
Past Due 90 Days or More and Still Accruing |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 135 |
Mortgage loans, one-to-four family |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 1,067 |  | 1,121 |
Loans receivable, Non-Accrual | 874 | [1] | 914 | [2]
Loans receivable, Current | 117,080 |  | 117,439 |
Loans receivable | 118,147 |  | 118,560 |
Mortgage loans, one-to-four family | 30-59 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 193 |  | 0 |
Mortgage loans, one-to-four family | 60-89 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 207 |
Mortgage loans, one-to-four family | Past Due 90 Days or More and Still Accruing |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 0 |
Mortgage loans, multi-family |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 0 |
Loans receivable, Non-Accrual | 0 | [1] | 0 | [2]
Loans receivable, Current | 58,607 |  | 62,303 |
Loans receivable | 58,607 |  | 62,303 |
Mortgage loans, multi-family | 30-59 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 0 |
Mortgage loans, multi-family | 60-89 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, 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, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 0 |
Mortgage loans, commercial |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 320 |  | 725 |
Loans receivable, Non-Accrual | 213 | [1] | 612 | [2]
Loans receivable, Current | 328,607 |  | 311,800 |
Loans receivable | 328,927 |  | 312,525 |
Mortgage loans, commercial | 30-59 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 113 |
Mortgage loans, commercial | 60-89 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 107 |  | 0 |
Mortgage loans, commercial | Past Due 90 Days or More and Still Accruing |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 0 |
Mortgage loans, construction - custom and owner/builder |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 367 |
Loans receivable, Non-Accrual | 0 | [1] | 367 | [2]
Loans receivable, Current | 63,538 |  | 51,662 |
Loans receivable | 63,538 |  | 52,029 |
Mortgage loans, construction - custom and owner/builder | 30-59 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, 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, Recorded Investment, 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, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 0 |
Mortgage loans, construction - speculative one-to-four family |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 0 |
Loans receivable, Non-Accrual | 0 | [1] | 0 | [2]
Loans receivable, Current | 4,639 |  | 4,074 |
Loans receivable | 4,639 |  | 4,074 |
Mortgage loans, construction - speculative one-to-four family | 30-59 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, 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, Recorded Investment, 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, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 0 |
Mortgage loans, construction - commercial |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 0 |
Loans receivable, Non-Accrual | 0 | [1] | 0 | [2]
Loans receivable, Current | 11,016 |  | 6,841 |
Loans receivable | 11,016 |  | 6,841 |
Mortgage loans, construction - commercial | 30-59 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 0 |
Mortgage loans, construction - commercial | 60-89 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, 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, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 0 |
Mortgage loans, construction - multi-family |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 0 |
Loans receivable, Non-Accrual | 0 | [1] | 0 | [2]
Loans receivable, Current | 6,912 |  | 11,539 |
Loans receivable | 6,912 |  | 11,539 |
Mortgage loans, construction - multi-family | 30-59 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 0 |
Mortgage loans, construction - multi-family | 60-89 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, 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, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 0 |
Mortgage loans, land |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 566 |  | 548 |
Loans receivable, Non-Accrual | 566 | [1] | 548 | [2]
Loans receivable, Current | 23,344 |  | 21,079 |
Loans receivable | 23,910 |  | 21,627 |
Mortgage loans, land | 30-59 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 0 |
Mortgage loans, land | 60-89 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 0 |
Mortgage loans, land | Past Due 90 Days or More and Still Accruing |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 0 |
Consumer loans, home equity and second mortgage |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 314 |  | 574 |
Loans receivable, Non-Accrual | 258 | [1] | 402 | [2]
Loans receivable, Current | 38,106 |  | 39,153 |
Loans receivable | 38,420 |  | 39,727 |
Consumer loans, home equity and second mortgage | 30-59 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 56 |  | 37 |
Consumer loans, home equity and second mortgage | 60-89 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, 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, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 135 |
Consumer loans, other |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 36 |  | 61 |
Loans receivable, Non-Accrual | 0 | [1] | 30 | [2]
Loans receivable, Current | 3,787 |  | 4,078 |
Loans receivable | 3,823 |  | 4,139 |
Consumer loans, other | 30-59 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 36 |  | 31 |
Consumer loans, other | 60-89 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, 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, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 0 |
Commercial business loans |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 110 |  | 75 |
Loans receivable, Non-Accrual | 0 | [1] | 0 | [2]
Loans receivable, Current | 44,334 |  | 41,762 |
Loans receivable | 44,444 |  | 41,837 |
Commercial business loans | 30-59 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 110 |  | 37 |
Commercial business loans | 60-89 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans receivable, Total Past Due | 0 |  | 38 |
Commercial business loans | Past Due 90 Days or More and Still Accruing |  |  |  |
Financing Receivable, Recorded Investment, 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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- Definition Financing receivables that are current. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953401-111524 + Details
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- Definition Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5111-111524 + Details
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