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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 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016
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Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | $ 396 |  | $ 476 |  |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 9,148 |  | 9,077 |  |  |
Allowance for Loan Losses, Total | 9,544 | $ 9,565 | 9,553 | $ 9,590 | $ 9,843 | $ 9,826
Recorded Investment in Loans, Individually Evaluated for Impairment | 5,196 |  | 6,992 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 715,431 |  | 695,391 |  |  |
Loans receivable | 720,627 |  | 702,383 |  |  |
Mortgage loans, 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 | 1,060 |  | 1,082 |  |  |
Allowance for Loan Losses, Total | 1,060 | 1,125 | 1,082 | 1,126 | 1,177 | 1,239
Recorded Investment in Loans, Individually Evaluated for Impairment | 1,318 |  | 1,443 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 111,544 |  | 116,704 |  |  |
Loans receivable | 112,862 |  | 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 | 386 |  | 447 |  |  |
Allowance for Loan Losses, Total | 386 | 430 | 447 | 480 | 400 | 473
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 |  | 0 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 55,157 |  | 58,607 |  |  |
Loans receivable | 55,157 |  | 58,607 |  |  |
Mortgage loans, commercial |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | 0 |  | 26 |  |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 4,198 |  | 4,158 |  |  |
Allowance for Loan Losses, Total | 4,198 | 4,093 | 4,184 | 4,316 | 4,523 | 4,384
Recorded Investment in Loans, Individually Evaluated for Impairment | 2,578 |  | 3,873 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 339,267 |  | 325,054 |  |  |
Loans receivable | 341,845 |  | 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 | 705 |  | 699 |  |  |
Allowance for Loan Losses, Total | 705 | 788 | 699 | 695 | 636 | 619
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 |  | 0 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 69,073 |  | 63,538 |  |  |
Loans receivable | 69,073 |  | 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 | 99 |  | 128 |  |  |
Allowance for Loan Losses, Total | 99 | 75 | 128 | 85 | 100 | 130
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 |  | 0 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 3,968 |  | 4,639 |  |  |
Loans receivable | 3,968 |  | 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 | 445 |  | 303 |  |  |
Allowance for Loan Losses, Total | 445 | 396 | 303 | 268 | 282 | 268
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 |  | 0 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 17,788 |  | 11,016 |  |  |
Loans receivable | 17,788 |  | 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 | 284 |  | 173 |  |  |
Allowance for Loan Losses, Total | 284 | 228 | 173 | 96 | 385 | 316
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 |  | 0 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 12,613 |  | 6,912 |  |  |
Loans receivable | 12,613 |  | 6,912 |  |  |
Mortgage loans, construction - Land development |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | 0 |  |  |  |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 48 |  |  |  |  |
Allowance for Loan Losses, Total | 48 | 0 | 0 |  |  |
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 |  |  |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 1,484 |  |  |  |  |
Loans receivable | 1,484 |  |  |  |  |
Mortgage loans, land |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | 40 |  | 125 |  |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 651 |  | 793 |  |  |
Allowance for Loan Losses, Total | 691 | 780 | 918 | 947 | 836 | 820
Recorded Investment in Loans, Individually Evaluated for Impairment | 640 |  | 1,119 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 19,962 |  | 22,791 |  |  |
Loans receivable | 20,602 |  | 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 | 293 |  | 325 |  |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 652 |  | 658 |  |  |
Allowance for Loan Losses, Total | 945 | 958 | 983 | 957 | 859 | 939
Recorded Investment in Loans, Individually Evaluated for Impairment | 479 |  | 557 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 37,645 |  | 37,863 |  |  |
Loans receivable | 38,124 |  | 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 | 120 |  | 121 |  |  |
Allowance for Loan Losses, Total | 120 | 129 | 121 | 130 | 156 | 156
Recorded Investment in Loans, Individually Evaluated for Impairment |  |  | 0 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 3,646 |  | 3,823 |  |  |
Loans receivable | 3,646 |  | 3,823 |  |  |
Commercial business loans |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | 63 |  | 0 |  |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 500 |  | 515 |  |  |
Allowance for Loan Losses, Total | 563 | $ 563 | 515 | $ 490 | $ 489 | $ 482
Recorded Investment in Loans, Individually Evaluated for Impairment | 181 |  | 0 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 43,284 |  | 44,444 |  |  |
Loans receivable | $ 43,465 |  | $ 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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