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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 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014
--- | --- | --- | --- | ---
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | $ 476 | $ 776 |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 9,077 | 9,050 |  |
Allowance for Loan Losses, Total | 9,553 | 9,826 | $ 9,924 | $ 10,427
Recorded Investment in Loans, Individually Evaluated for Impairment | 6,992 | 16,237 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 695,391 | 658,964 |  |
Loans receivable | 702,383 | 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 | 1,082 | 1,169 |  |
Allowance for Loan Losses, Total | 1,082 | 1,239 | 1,480 | 1,650
Recorded Investment in Loans, Individually Evaluated for Impairment | 1,443 | 2,264 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 116,704 | 116,296 |  |
Loans receivable | 118,147 | 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 | 447 | 473 |  |
Allowance for Loan Losses, Total | 447 | 473 | 392 | 387
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 | 0 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 58,607 | 62,303 |  |
Loans receivable | 58,607 | 62,303 |  |
Mortgage loans, commercial |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | 26 | 413 |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 4,158 | 3,971 |  |
Allowance for Loan Losses, Total | 4,184 | 4,384 | 4,065 | 4,836
Recorded Investment in Loans, Individually Evaluated for Impairment | 3,873 | 11,309 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 325,054 | 301,216 |  |
Loans receivable | 328,927 | 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 | 699 | 619 |  |
Allowance for Loan Losses, Total | 699 | 619 | 451 | 450
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 | 367 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 63,538 | 51,662 |  |
Loans receivable | 63,538 | 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 | 128 | 130 |  |
Allowance for Loan Losses, Total | 128 | 130 | 123 | 52
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 | 0 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 4,639 | 4,074 |  |
Loans receivable | 4,639 | 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 | 303 | 268 |  |
Allowance for Loan Losses, Total | 303 | 268 | 426 | 78
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 | 0 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 11,016 | 6,841 |  |
Loans receivable | 11,016 | 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 | 173 | 316 |  |
Allowance for Loan Losses, Total | 173 | 316 | 283 | 25
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 | 0 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 6,912 | 11,539 |  |
Loans receivable | 6,912 | 11,539 |  |
Mortgage loans, land |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | 125 | 53 |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 793 | 767 |  |
Allowance for Loan Losses, Total | 918 | 820 | 1,021 | 1,434
Recorded Investment in Loans, Individually Evaluated for Impairment | 1,119 | 1,268 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 22,791 | 20,359 |  |
Loans receivable | 23,910 | 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 | 325 | 227 |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 658 | 712 |  |
Allowance for Loan Losses, Total | 983 | 939 | 1,073 | 879
Recorded Investment in Loans, Individually Evaluated for Impairment | 557 | 999 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 37,863 | 38,728 |  |
Loans receivable | 38,420 | 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 | 121 | 143 |  |
Allowance for Loan Losses, Total | 121 | 156 | 187 | 176
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 | 30 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 3,823 | 4,109 |  |
Loans receivable | 3,823 | 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 | 515 | 482 |  |
Allowance for Loan Losses, Total | 515 | 482 | $ 423 | $ 460
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 | 0 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 44,444 | 41,837 |  |
Loans receivable | $ 44,444 | $ 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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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The balance of financing receivables 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 (h) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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