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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, 2019 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
--- | --- | --- | --- | ---
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | $ 172 | $ 97 |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 9,518 | 9,433 |  |
Allowance for Loan Losses, Total | 9,690 | 9,530 | $ 9,553 | $ 9,826
Recorded Investment in Loans, Individually Evaluated for Impairment | 5,937 | 4,272 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 893,213 | 733,286 |  |
Loans receivable | 899,150 | 737,558 |  |
Mortgage loans, one-to-four family |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | 0 | 0 |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 1,167 | 1,086 |  |
Allowance for Loan Losses, Total | 1,167 | 1,086 | 1,082 | 1,239
Recorded Investment in Loans, Individually Evaluated for Impairment | 1,192 | 1,054 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 131,469 | 114,887 |  |
Loans receivable | 132,661 | 115,941 |  |
Mortgage loans, multi-family |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | 0 | 0 |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 481 | 433 |  |
Allowance for Loan Losses, Total | 481 | 433 | 447 | 473
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 | 0 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 76,036 | 61,928 |  |
Loans receivable | 76,036 | 61,928 |  |
Mortgage loans, commercial |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | 0 | 0 |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 4,154 | 4,248 |  |
Allowance for Loan Losses, Total | 4,154 | 4,248 | 4,184 | 4,384
Recorded Investment in Loans, Individually Evaluated for Impairment | 3,190 | 2,446 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 415,927 | 342,667 |  |
Loans receivable | 419,117 | 345,113 |  |
Mortgage loans, construction - custom and owner/builder |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | 0 | 0 |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 755 | 671 |  |
Allowance for Loan Losses, Total | 755 | 671 | 699 | 619
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 | 0 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 75,411 | 67,024 |  |
Loans receivable | 75,411 | 67,024 |  |
Mortgage loans, construction - speculative one-to-four family |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | 0 | 0 |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 212 | 178 |  |
Allowance for Loan Losses, Total | 212 | 178 | 128 | 130
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 | 0 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 10,779 | 7,107 |  |
Loans receivable | 10,779 | 7,107 |  |
Mortgage loans, construction - commercial |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | 0 | 0 |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 338 | 563 |  |
Allowance for Loan Losses, Total | 338 | 563 | 303 | 268
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 | 0 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 24,051 | 23,440 |  |
Loans receivable | 24,051 | 23,440 |  |
Mortgage loans, construction - multi-family |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | 0 | 0 |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 375 | 135 |  |
Allowance for Loan Losses, Total | 375 | 135 | 173 | 316
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 | 0 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 19,256 | 5,983 |  |
Loans receivable | 19,256 | 5,983 |  |
Mortgage loans - construction - land development |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | 0 | 0 |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 67 | 49 |  |
Allowance for Loan Losses, Total | 67 | 49 | 0 |
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 | 0 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 1,803 | 1,567 |  |
Loans receivable | 1,803 | 1,567 |  |
Mortgage loans, land |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | 27 | 34 |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 670 | 810 |  |
Allowance for Loan Losses, Total | 697 | 844 | 918 | 820
Recorded Investment in Loans, Individually Evaluated for Impairment | 204 | 243 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 30,566 | 25,303 |  |
Loans receivable | 30,770 | 25,546 |  |
Consumer loans, home equity and second mortgage |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | 0 | 0 |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 623 | 649 |  |
Allowance for Loan Losses, Total | 623 | 649 | 983 | 939
Recorded Investment in Loans, Individually Evaluated for Impairment | 603 | 359 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 39,587 | 36,982 |  |
Loans receivable | 40,190 | 37,341 |  |
Consumer loans, other |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | 17 | 0 |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 82 | 117 |  |
Allowance for Loan Losses, Total | 99 | 117 | 121 | 156
Recorded Investment in Loans, Individually Evaluated for Impairment | 23 | 0 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 4,289 | 3,515 |  |
Loans receivable | 4,312 | 3,515 |  |
Commercial business loans |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | 128 | 63 |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 594 | 494 |  |
Allowance for Loan Losses, Total | 722 | 557 | $ 515 | $ 482
Recorded Investment in Loans, Individually Evaluated for Impairment | 725 | 170 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 64,039 | 42,883 |  |
Loans receivable | $ 64,764 | $ 43,053 |  |

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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 Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118955202&loc=SL82895884-210446 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524 + Details
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