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Loans Receivable and Allowance for Loan Losses: Financing Receivable Credit Quality Indicators (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Sep. 30, 2016
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable | $ 702,383 | $ 675,201
Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable | 682,391 | 644,423
Watch |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable | 8,956 | 10,677
Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable | 7,783 | 15,065
Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable | 3,253 | 5,036
Mortgage loans, one-to-four family |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable | 118,147 | 118,560
Mortgage loans, one-to-four family | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable | 115,481 | 115,131
Mortgage loans, one-to-four family | Watch |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable | 422 | 364
Mortgage loans, one-to-four family | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable | 644 | 661
Mortgage loans, one-to-four family | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable | 1,600 | 2,404
Mortgage loans, multi-family |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable | 58,607 | 62,303
Mortgage loans, multi-family | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable | 56,857 | 60,504
Mortgage loans, multi-family | Watch |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable | 0 | 0
Mortgage loans, multi-family | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable | 1,750 | 1,799
Mortgage loans, multi-family | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable | 0 | 0
Mortgage loans, commercial |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable | 328,927 | 312,525
Mortgage loans, commercial | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable | 318,717 | 292,756
Mortgage loans, commercial | Watch |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable | 6,059 | 8,411
Mortgage loans, commercial | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable | 3,540 | 10,746
Mortgage loans, commercial | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable | 611 | 612
Mortgage loans, construction - custom and owner/builder |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable | 63,538 | 52,029
Mortgage loans, construction - custom and owner/builder | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable | 63,210 | 51,432
Mortgage loans, construction - custom and owner/builder | Watch |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable | 328 | 229
Mortgage loans, construction - custom and owner/builder | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable | 0 | 0
Mortgage loans, construction - custom and owner/builder | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable | 0 | 368
Mortgage loans, construction - speculative one-to-four family |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable | 4,639 | 4,074
Mortgage loans, construction - speculative one-to-four family | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable | 4,639 | 4,074
Mortgage loans, construction - speculative one-to-four family | Watch |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable | 0 | 0
Mortgage loans, construction - speculative one-to-four family | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable | 0 | 0
Mortgage loans, construction - speculative one-to-four family | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable | 0 | 0
Mortgage loans, construction - commercial |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable | 11,016 | 6,841
Mortgage loans, construction - commercial | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable | 11,016 | 6,841
Mortgage loans, construction - commercial | Watch |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable | 0 | 0
Mortgage loans, construction - commercial | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable | 0 | 0
Mortgage loans, construction - commercial | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable | 0 | 0
Mortgage loans, construction - multi-family |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable | 6,912 | 11,539
Mortgage loans, construction - multi-family | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable | 6,912 | 11,539
Mortgage loans, construction - multi-family | Watch |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable | 0 | 0
Mortgage loans, construction - multi-family | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable | 0 | 0
Mortgage loans, construction - multi-family | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable | 0 | 0
Mortgage loans, land |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable | 23,910 | 21,627
Mortgage loans, land | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable | 20,528 | 18,010
Mortgage loans, land | Watch |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable | 1,022 | 1,043
Mortgage loans, land | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable | 1,794 | 1,859
Mortgage loans, land | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable | 566 | 715
Consumer loans, home equity and second mortgage |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable | 38,420 | 39,727
Consumer loans, home equity and second mortgage | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable | 37,828 | 38,261
Consumer loans, home equity and second mortgage | Watch |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable | 152 | 590
Consumer loans, home equity and second mortgage | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable | 0 | 0
Consumer loans, home equity and second mortgage | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable | 440 | 876
Consumer loans, other |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable | 3,823 | 4,139
Consumer loans, other | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable | 3,787 | 4,078
Consumer loans, other | Watch |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable | 0 | 0
Consumer loans, other | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable | 0 | 0
Consumer loans, other | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable | 36 | 61
Commercial business loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable | 44,444 | 41,837
Commercial business loans | Pass |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable | 43,416 | 41,797
Commercial business loans | Watch |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable | 973 | 40
Commercial business loans | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable | 55 | 0
Commercial business loans | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable | $ 0 | $ 0

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