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Loans Receivable And Allowance For Loan Losses: Past Due Status of Loans (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Sep. 30, 2017
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Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | $ 3,287 | $ 2,413
Loans receivable, Non-Accrual | [1] | 1,932 | 1,911
Loans receivable, Current |  | 717,340 | 699,970
Loans receivable |  | 720,627 | 702,383
Mortgage loans, one-to-four family |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 1,048 | 1,067
Loans receivable, Non-Accrual | [1] | 801 | 874
Loans receivable, Current |  | 111,814 | 117,080
Loans receivable |  | 112,862 | 118,147
Mortgage loans, multi-family |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 0
Loans receivable, Non-Accrual | [1] | 0 | 0
Loans receivable, Current |  | 55,157 | 58,607
Loans receivable |  | 55,157 | 58,607
Mortgage loans, commercial |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 1,166 | 320
Loans receivable, Non-Accrual | [1] | 370 | 213
Loans receivable, Current |  | 340,679 | 328,607
Loans receivable |  | 341,845 | 328,927
Mortgage loans, construction - custom and owner/builder |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 0
Loans receivable, Non-Accrual | [1] | 0 | 0
Loans receivable, Current |  | 69,073 | 63,538
Loans receivable |  | 69,073 | 63,538
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 | [1] | 0 | 0
Loans receivable, Current |  | 3,968 | 4,639
Loans receivable |  | 3,968 | 4,639
Mortgage loans, construction – commercial |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 0
Loans receivable, Non-Accrual | [1] | 0 | 0
Loans receivable, Current |  | 17,788 | 11,016
Loans receivable |  | 17,788 | 11,016
Mortgage loans, construction - Multi-family |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 0
Loans receivable, Non-Accrual | [1] | 0 | 0
Loans receivable, Current |  | 12,613 | 6,912
Loans receivable |  | 12,613 | 6,912
Mortgage loans, construction - Land development |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 |
Loans receivable, Non-Accrual | [1] | 0 |
Loans receivable, Current |  | 1,484 |
Loans receivable |  | 1,484 |
Mortgage loans, land |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 508 | 566
Loans receivable, Non-Accrual | [1] | 395 | 566
Loans receivable, Current |  | 20,094 | 23,344
Loans receivable |  | 20,602 | 23,910
Consumer loans, home equity and second mortgage |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 261 | 314
Loans receivable, Non-Accrual | [1] | 185 | 258
Loans receivable, Current |  | 37,863 | 38,106
Loans receivable |  | 38,124 | 38,420
Consumer loans, other |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 36
Loans receivable, Non-Accrual | [1] | 0 | 0
Loans receivable, Current |  | 3,646 | 3,787
Loans receivable |  | 3,646 | 3,823
Commercial business loans |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 304 | 110
Loans receivable, Non-Accrual | [1] | 181 | 0
Loans receivable, Current |  | 43,161 | 44,334
Loans receivable |  | 43,465 | 44,444
30 to 59 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 1,084 | 395
30 to 59 Days Past Due | Mortgage loans, one-to-four family |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 193
30 to 59 Days Past Due | Mortgage loans, multi-family |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 0
30 to 59 Days Past Due | Mortgage loans, commercial |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 796 | 0
30 to 59 Days Past Due | Mortgage loans, construction - custom and owner/builder |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 0
30 to 59 Days Past Due | Mortgage loans, construction - speculative one-to-four family |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 0
30 to 59 Days Past Due | Mortgage loans, construction – commercial |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 0
30 to 59 Days Past Due | Mortgage loans, construction - Multi-family |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 0
30 to 59 Days Past Due | Mortgage loans, construction - Land development |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 |
30 to 59 Days Past Due | Mortgage loans, land |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 113 | 0
30 to 59 Days Past Due | Consumer loans, home equity and second mortgage |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 52 | 56
30 to 59 Days Past Due | Consumer loans, other |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 36
30 to 59 Days Past Due | Commercial business loans |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 123 | 110
60 to 89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 271 | 107
60 to 89 Days Past Due | Mortgage loans, one-to-four family |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 247 | 0
60 to 89 Days Past Due | Mortgage loans, multi-family |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 0
60 to 89 Days Past Due | Mortgage loans, commercial |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 107
60 to 89 Days Past Due | Mortgage loans, construction - custom and owner/builder |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 0
60 to 89 Days Past Due | Mortgage loans, construction - speculative one-to-four family |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 0
60 to 89 Days Past Due | Mortgage loans, construction – commercial |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 0
60 to 89 Days Past Due | Mortgage loans, construction - Multi-family |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 0
60 to 89 Days Past Due | Mortgage loans, construction - Land development |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 |
60 to 89 Days Past Due | Mortgage loans, land |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 0
60 to 89 Days Past Due | Consumer loans, home equity and second mortgage |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 24 | 0
60 to 89 Days Past Due | Consumer loans, other |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 0
60 to 89 Days Past Due | Commercial business loans |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 0
Past Due 90 Days or More and Still Accruing |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 0
Past Due 90 Days or More and Still Accruing | Mortgage loans, one-to-four family |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 0
Past Due 90 Days or More and Still Accruing | Mortgage loans, multi-family |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 0
Past Due 90 Days or More and Still Accruing | Mortgage loans, commercial |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 0
Past Due 90 Days or More and Still Accruing | Mortgage loans, construction - custom and owner/builder |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 0
Past Due 90 Days or More and Still Accruing | Mortgage loans, construction - speculative one-to-four family |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 0
Past Due 90 Days or More and Still Accruing | Mortgage loans, construction – commercial |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 0
Past Due 90 Days or More and Still Accruing | Mortgage loans, construction - Multi-family |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 0
Past Due 90 Days or More and Still Accruing | Mortgage loans, construction - Land development |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 |
Past Due 90 Days or More and Still Accruing | Mortgage loans, land |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 0
Past Due 90 Days or More and Still Accruing | Consumer loans, home equity and second mortgage |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 0
Past Due 90 Days or More and Still Accruing | Consumer loans, other |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 0
Past Due 90 Days or More and Still Accruing | Commercial business loans |  |  |
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.

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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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