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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, 2020 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
--- | --- | --- | --- | ---
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | $ 41 | $ 172 |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 13,373 | 9,518 |  |
Allowance for Loan Losses, Total | 13,414 | 9,690 | $ 9,530 | $ 9,553
Recorded Investment in Loans, Individually Evaluated for Impairment | 5,773 | 5,937 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 1,027,952 | 893,213 |  |
Loans receivable | 1,033,725 | 899,150 |  |
Mortgage loans, one-to-four family |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | 3 | 0 |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 1,160 | 1,167 |  |
Allowance for Loan Losses, Total | 1,163 | 1,167 | 1,086 | 1,082
Recorded Investment in Loans, Individually Evaluated for Impairment | 1,143 | 1,192 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 117,437 | 131,469 |  |
Loans receivable | 118,580 | 132,661 |  |
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 | 718 | 481 |  |
Allowance for Loan Losses, Total | 718 | 481 | 433 | 447
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 | 0 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 85,053 | 76,036 |  |
Loans receivable | 85,053 | 76,036 |  |
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 | 7,144 | 4,154 |  |
Allowance for Loan Losses, Total | 7,144 | 4,154 | 4,248 | 4,184
Recorded Investment in Loans, Individually Evaluated for Impairment | 3,242 | 3,190 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 450,332 | 415,927 |  |
Loans receivable | 453,574 | 419,117 |  |
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 | 832 | 755 |  |
Allowance for Loan Losses, Total | 832 | 755 | 671 | 699
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 | 0 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 75,332 | 75,411 |  |
Loans receivable | 75,332 | 75,411 |  |
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 | 158 | 212 |  |
Allowance for Loan Losses, Total | 158 | 212 | 178 | 128
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 | 0 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 7,108 | 10,779 |  |
Loans receivable | 7,108 | 10,779 |  |
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 | 420 | 338 |  |
Allowance for Loan Losses, Total | 420 | 338 | 563 | 303
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 | 0 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 20,927 | 24,051 |  |
Loans receivable | 20,927 | 24,051 |  |
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 | 238 | 375 |  |
Allowance for Loan Losses, Total | 238 | 375 | 135 | 173
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 | 0 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 10,832 | 19,256 |  |
Loans receivable | 10,832 | 19,256 |  |
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 | 133 | 67 |  |
Allowance for Loan Losses, Total | 133 | 67 | 49 | 0
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 | 0 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 4,739 | 1,803 |  |
Loans receivable | 4,739 | 1,803 |  |
Mortgage loans, land |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | 0 | 27 |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 572 | 670 |  |
Allowance for Loan Losses, Total | 572 | 697 | 844 | 918
Recorded Investment in Loans, Individually Evaluated for Impairment | 394 | 204 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 25,177 | 30,566 |  |
Loans receivable | 25,571 | 30,770 |  |
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 | 593 | 623 |  |
Allowance for Loan Losses, Total | 593 | 623 | 649 | 983
Recorded Investment in Loans, Individually Evaluated for Impairment | 555 | 603 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 31,522 | 39,587 |  |
Loans receivable | 32,077 | 40,190 |  |
Consumer loans, other |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | 0 | 17 |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 71 | 82 |  |
Allowance for Loan Losses, Total | 71 | 99 | 117 | 121
Recorded Investment in Loans, Individually Evaluated for Impairment | 9 | 23 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 3,563 | 4,289 |  |
Loans receivable | 3,572 | 4,312 |  |
Commercial business loans |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | 38 | 128 |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 1,334 | 594 |  |
Allowance for Loan Losses, Total | 1,372 | 722 | $ 557 | $ 515
Recorded Investment in Loans, Individually Evaluated for Impairment | 430 | 725 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 69,110 | 64,039 |  |
Loans receivable | 69,540 | $ 64,764 |  |
SBA PPP Loans |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | 0 |  |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 0 |  |  |
Allowance for Loan Losses, Total | 0 |  |  |
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 126,820 |  |  |
Loans receivable | $ 126,820 |  |  |

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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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