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Loans Receivable And Allowance For Loan Losses: Schedule of loans evaluated individually for impairment and collectively evaluated for impairment in the allowance for loan losses (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Sep. 30, 2017 | Dec. 31, 2016 | Sep. 30, 2016
--- | --- | --- | --- | ---
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | $ 435 | $ 476 |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 9,130 | 9,077 |  |
Allowance for Loan Losses, Total | 9,565 | 9,553 | $ 9,843 | $ 9,826
Recorded Investment in Loans, Individually Evaluated for Impairment | 7,120 | 6,992 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 710,217 | 695,391 |  |
Loans receivable | 717,337 | 702,383 |  |
Mortgage loans, one-to-four family |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | 1 | 0 |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 1,124 | 1,082 |  |
Allowance for Loan Losses, Total | 1,125 | 1,082 | 1,177 | 1,239
Recorded Investment in Loans, Individually Evaluated for Impairment | 1,467 | 1,443 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 115,509 | 116,704 |  |
Loans receivable | 116,976 | 118,147 |  |
Mortgage loans, multi-family |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | 0 | 0 |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 430 | 447 |  |
Allowance for Loan Losses, Total | 430 | 447 | 400 | 473
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 | 0 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 61,366 | 58,607 |  |
Loans receivable | 61,366 | 58,607 |  |
Mortgage loans, commercial |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | 16 | 26 |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 4,077 | 4,158 |  |
Allowance for Loan Losses, Total | 4,093 | 4,184 | 4,523 | 4,384
Recorded Investment in Loans, Individually Evaluated for Impairment | 4,044 | 3,873 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 329,041 | 325,054 |  |
Loans receivable | 333,085 | 328,927 |  |
Mortgage loans, construction - custom and owner/builder |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | 0 | 0 |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 788 | 699 |  |
Allowance for Loan Losses, Total | 788 | 699 | 636 | 619
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 | 0 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 71,548 | 63,538 |  |
Loans receivable | 71,548 | 63,538 |  |
Mortgage loans, construction - speculative one-to-four family |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | 0 | 0 |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 75 | 128 |  |
Allowance for Loan Losses, Total | 75 | 128 | 100 | 130
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 | 0 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 2,723 | 4,639 |  |
Loans receivable | 2,723 | 4,639 |  |
Mortgage loans, construction – commercial |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | 0 | 0 |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 396 | 303 |  |
Allowance for Loan Losses, Total | 396 | 303 | 282 | 268
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 | 0 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 14,390 | 11,016 |  |
Loans receivable | 14,390 | 11,016 |  |
Mortgage loans, construction - Multi-family |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | 0 | 0 |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 228 | 173 |  |
Allowance for Loan Losses, Total | 228 | 173 | 385 | 316
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 | 0 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 9,109 | 6,912 |  |
Loans receivable | 9,109 | 6,912 |  |
Mortgage loans, land |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | 72 | 125 |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 708 | 793 |  |
Allowance for Loan Losses, Total | 780 | 918 | 836 | 820
Recorded Investment in Loans, Individually Evaluated for Impairment | 944 | 1,119 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 20,178 | 22,791 |  |
Loans receivable | 21,122 | 23,910 |  |
Consumer loans, home equity and second mortgage |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | 291 | 325 |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 667 | 658 |  |
Allowance for Loan Losses, Total | 958 | 983 | 859 | 939
Recorded Investment in Loans, Individually Evaluated for Impairment | 484 | 557 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 38,491 | 37,863 |  |
Loans receivable | 38,975 | 38,420 |  |
Consumer loans, other |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | 0 | 0 |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 129 | 121 |  |
Allowance for Loan Losses, Total | 129 | 121 | 156 | 156
Recorded Investment in Loans, Individually Evaluated for Impairment |  | 0 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 4,050 | 3,823 |  |
Loans receivable | 4,050 | 3,823 |  |
Commercial business loans |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | 55 | 0 |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 508 | 515 |  |
Allowance for Loan Losses, Total | 563 | 515 | $ 489 | $ 482
Recorded Investment in Loans, Individually Evaluated for Impairment | 181 | 0 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 43,812 | 44,444 |  |
Loans receivable | $ 43,993 | $ 44,444 |  |

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- Definition Loans Receivable, Including Loans Held-For-Sale and Loans in Process, Gross + References No definition available. + Details
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- Definition A valuation allowance for financing receivables that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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