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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, 2021 | Mar. 31, 2021 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019
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Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | $ 171 |  | $ 41 |  |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 13,298 |  | 13,373 |  |  |
Allowance for Loan Losses, Total | 13,469 | $ 13,434 | 13,414 | $ 12,894 | $ 11,890 | $ 9,690
Recorded Investment in Loans, Individually Evaluated for Impairment | 4,409 |  | 5,773 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 1,016,964 |  | 1,027,952 |  |  |
Loans receivable | 1,021,373 |  | 1,033,725 |  |  |
Mortgage loans, one-to-four family |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | 0 |  | 3 |  |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 1,142 |  | 1,160 |  |  |
Allowance for Loan Losses, Total | 1,142 | 1,151 | 1,163 | 1,163 | 1,149 | 1,167
Recorded Investment in Loans, Individually Evaluated for Impairment | 411 |  | 1,143 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 118,762 |  | 117,437 |  |  |
Loans receivable | 119,173 |  | 118,580 |  |  |
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 | 810 |  | 718 |  |  |
Allowance for Loan Losses, Total | 810 | 784 | 718 | 665 | 595 | 481
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 |  | 0 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 94,756 |  | 85,053 |  |  |
Loans receivable | 94,756 |  | 85,053 |  |  |
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 | 6,961 |  | 7,144 |  |  |
Allowance for Loan Losses, Total | 6,961 | 7,238 | 7,144 | 6,719 | 5,762 | 4,154
Recorded Investment in Loans, Individually Evaluated for Impairment | 2,753 |  | 3,242 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 456,136 |  | 450,332 |  |  |
Loans receivable | 458,889 |  | 453,574 |  |  |
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 | 604 |  | 832 |  |  |
Allowance for Loan Losses, Total | 604 | 695 | 832 | 807 | 697 | 755
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 |  | 0 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 57,309 |  | 75,332 |  |  |
Loans receivable | 57,309 |  | 75,332 |  |  |
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 | 184 |  | 158 |  |  |
Allowance for Loan Losses, Total | 184 | 148 | 158 | 164 | 204 | 212
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 |  | 0 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 9,263 |  | 7,108 |  |  |
Loans receivable | 9,263 |  | 7,108 |  |  |
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 | 758 |  | 420 |  |  |
Allowance for Loan Losses, Total | 758 | 714 | 420 | 304 | 423 | 338
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 |  | 0 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 37,007 |  | 20,927 |  |  |
Loans receivable | 37,007 |  | 20,927 |  |  |
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 | 448 |  | 238 |  |  |
Allowance for Loan Losses, Total | 448 | 323 | 238 | 318 | 394 | 375
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 |  | 0 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 22,397 |  | 10,832 |  |  |
Loans receivable | 22,397 |  | 10,832 |  |  |
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 | 31 |  | 133 |  |  |
Allowance for Loan Losses, Total | 31 | 19 | 133 | 107 | 80 | 67
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 |  | 0 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 1,151 |  | 4,739 |  |  |
Loans receivable | 1,151 |  | 4,739 |  |  |
Mortgage loans, land |  |  |  |  |  |
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 | 384 |  | 572 |  |  |
Allowance for Loan Losses, Total | 384 | 407 | 572 | 642 | 678 | 697
Recorded Investment in Loans, Individually Evaluated for Impairment | 169 |  | 394 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 18,120 |  | 25,177 |  |  |
Loans receivable | 18,289 |  | 25,571 |  |  |
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 | 551 |  | 593 |  |  |
Allowance for Loan Losses, Total | 551 | 552 | 593 | 632 | 656 | 623
Recorded Investment in Loans, Individually Evaluated for Impairment | 545 |  | 555 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 31,346 |  | 31,522 |  |  |
Loans receivable | 31,891 |  | 32,077 |  |  |
Consumer loans, other |  |  |  |  |  |
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 | 56 |  | 71 |  |  |
Allowance for Loan Losses, Total | 56 | 56 | 71 | 73 | 78 | 99
Recorded Investment in Loans, Individually Evaluated for Impairment | 18 |  | 9 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 2,707 |  | 3,563 |  |  |
Loans receivable | 2,725 |  | 3,572 |  |  |
Commercial business loans |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | 171 |  | 38 |  |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 1,369 |  | 1,334 |  |  |
Allowance for Loan Losses, Total | 1,540 | $ 1,347 | 1,372 | $ 1,300 | $ 1,174 | $ 722
Recorded Investment in Loans, Individually Evaluated for Impairment | 513 |  | 430 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 72,377 |  | 69,110 |  |  |
Loans receivable | 72,890 |  | 69,540 |  |  |
SBA PPP Loans |  |  |  |  |  |
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 | 0 |  | 0 |  |  |
Allowance for Loan Losses, Total | 0 |  | 0 |  |  |
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 |  | 0 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 95,633 |  | 126,820 |  |  |
Loans receivable | $ 95,633 |  | $ 126,820 |  |  |

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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=123577603&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)(2)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: 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=124255206&loc=SL82895884-210446 Reference 4: 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=124255953&loc=SL82919249-210447 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=124255953&loc=SL82919249-210447 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (a) -Subparagraph (3) Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (c) Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (a) -Subparagraph (1) + Details
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