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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 | Jun. 30, 2017 | Mar. 31, 2017 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Sep. 30, 2015
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Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | $ 429 |  | $ 776 |  |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 9,181 |  | 9,050 |  |  |
Allowance for Loan Losses, Total | 9,610 | $ 9,590 | 9,826 | $ 9,842 | $ 10,043 | $ 9,924
Recorded Investment in Loans, Individually Evaluated for Impairment | 7,167 |  | 16,237 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 691,910 |  | 658,964 |  |  |
Loans receivable | 699,077 |  | 675,201 |  |  |
Mortgage loans, one-to-four family |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | 0 |  | 70 |  |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 1,115 |  | 1,169 |  |  |
Allowance for Loan Losses, Total | 1,115 | 1,126 | 1,239 | 1,214 | 1,323 | 1,480
Recorded Investment in Loans, Individually Evaluated for Impairment | 1,469 |  | 2,264 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 120,236 |  | 116,296 |  |  |
Loans receivable | 121,705 |  | 118,560 |  |  |
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 | 464 |  | 473 |  |  |
Allowance for Loan Losses, Total | 464 | 480 | 473 | 348 | 315 | 392
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 |  | 0 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 61,051 |  | 62,303 |  |  |
Loans receivable | 61,051 |  | 62,303 |  |  |
Mortgage loans, commercial |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | 20 |  | 413 |  |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 4,317 |  | 3,971 |  |  |
Allowance for Loan Losses, Total | 4,337 | 4,316 | 4,384 | 3,974 | 4,083 | 4,065
Recorded Investment in Loans, Individually Evaluated for Impairment | 4,084 |  | 11,309 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 327,817 |  | 301,216 |  |  |
Loans receivable | 331,901 |  | 312,525 |  |  |
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 | 712 |  | 619 |  |  |
Allowance for Loan Losses, Total | 712 | 695 | 619 | 635 | 542 | 451
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 |  | 367 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 59,352 |  | 51,662 |  |  |
Loans receivable | 59,352 |  | 52,029 |  |  |
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 |  | 130 |  |  |
Allowance for Loan Losses, Total | 75 | 85 | 130 | 121 | 96 | 123
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 |  | 0 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 2,506 |  | 4,074 |  |  |
Loans receivable | 2,506 |  | 4,074 |  |  |
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 | 283 |  | 268 |  |  |
Allowance for Loan Losses, Total | 283 | 268 | 268 | 624 | 617 | 426
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 |  | 0 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 9,417 |  | 6,841 |  |  |
Loans receivable | 9,417 |  | 6,841 |  |  |
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 | 132 |  | 316 |  |  |
Allowance for Loan Losses, Total | 132 | 96 | 316 | 387 | 409 | 283
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 |  | 0 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 5,296 |  | 11,539 |  |  |
Loans receivable | 5,296 |  | 11,539 |  |  |
Mortgage loans, land |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | 89 |  | 53 |  |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 815 |  | 767 |  |  |
Allowance for Loan Losses, Total | 904 | 947 | 820 | 919 | 954 | 1,021
Recorded Investment in Loans, Individually Evaluated for Impairment | 1,054 |  | 1,268 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 23,279 |  | 20,359 |  |  |
Loans receivable | 24,333 |  | 21,627 |  |  |
Consumer loans, home equity and second mortgage |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | 320 |  | 227 |  |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 635 |  | 712 |  |  |
Allowance for Loan Losses, Total | 955 | 957 | 939 | 961 | 1,021 | 1,073
Recorded Investment in Loans, Individually Evaluated for Impairment | 560 |  | 999 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 35,760 |  | 38,728 |  |  |
Loans receivable | 36,320 |  | 39,727 |  |  |
Consumer loans, other |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | 0 |  | 13 |  |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 134 |  | 143 |  |  |
Allowance for Loan Losses, Total | 134 | 130 | 156 | 157 | 162 | 187
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 |  | 30 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 3,789 |  | 4,109 |  |  |
Loans receivable | 3,789 |  | 4,139 |  |  |
Commercial business loans |  |  |  |  |  |
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 | 499 |  | 482 |  |  |
Allowance for Loan Losses, Total | 499 | $ 490 | 482 | $ 502 | $ 521 | $ 423
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 |  | 0 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 43,407 |  | 41,837 |  |  |
Loans receivable | $ 43,407 |  | $ 41,837 |  |  |

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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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