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Loans Receivable And Allowance For Loan Losses: Past Due Status of Loans (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Sep. 30, 2016
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Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | $ 4,060 | $ 3,471
Loans receivable, Non-Accrual | [1] | 2,364 | 2,873
Loans receivable, Current |  | 677,107 | 671,730
Loans receivable |  | 681,167 | 675,201
Mortgage loans, one-to-four family |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 1,240 | 1,121
Loans receivable, Non-Accrual | [1] | 846 | 914
Loans receivable, Current |  | 118,245 | 117,439
Loans receivable |  | 119,485 | 118,560
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 |  | 52,062 | 62,303
Loans receivable |  | 52,062 | 62,303
Mortgage loans, commercial |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 410 | 725
Loans receivable, Non-Accrual | [1] | 0 | 612
Loans receivable, Current |  | 323,086 | 311,800
Loans receivable |  | 323,496 | 312,525
Mortgage loans, construction - custom and owner/builder |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 580 | 367
Loans receivable, Non-Accrual | [1] | 367 | 367
Loans receivable, Current |  | 52,968 | 51,662
Loans receivable |  | 53,548 | 52,029
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 |  | 3,118 | 4,074
Loans receivable |  | 3,118 | 4,074
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 |  | 6,860 | 6,841
Loans receivable |  | 6,860 | 6,841
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 |  | 15,457 | 11,539
Loans receivable |  | 15,457 | 11,539
Mortgage loans, land |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 967 | 548
Loans receivable, Non-Accrual | [1] | 735 | 548
Loans receivable, Current |  | 21,392 | 21,079
Loans receivable |  | 22,359 | 21,627
Consumer loans, home equity and second mortgage |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 769 | 574
Loans receivable, Non-Accrual | [1] | 387 | 402
Loans receivable, Current |  | 36,833 | 39,153
Loans receivable |  | 37,602 | 39,727
Consumer loans, other |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 60 | 61
Loans receivable, Non-Accrual | [1] | 29 | 30
Loans receivable, Current |  | 4,463 | 4,078
Loans receivable |  | 4,523 | 4,139
Commercial business loans |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 34 | 75
Loans receivable, Non-Accrual | [1] | 0 | 0
Loans receivable, Current |  | 42,623 | 41,762
Loans receivable |  | 42,657 | 41,837
30 to 59 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 1,409 | 218
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 |  | 394 | 0
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 |  | 299 | 113
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 |  | 213 | 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, land |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 232 | 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 |  | 206 | 37
30 to 59 Days Past Due | Consumer loans, other |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 31 | 31
30 to 59 Days Past Due | Commercial business loans |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 34 | 37
60 to 89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 152 | 245
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 |  | 0 | 207
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 |  | 111 | 0
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, 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 |  | 41 | 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 | 38
Past Due 90 Days or More and Still Accruing |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 135 | 135
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, 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 |  | 135 | 135
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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