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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 | Dec. 31, 2021 | Sep. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020
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Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | $ 254 | $ 247 |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 13,214 | 13,222 |  |
Allowance for Loan Losses, Total | 13,468 | 13,469 | $ 13,432 | $ 13,414
Recorded Investment in Loans, Individually Evaluated for Impairment | 5,214 | 5,224 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 1,006,800 | 981,842 |  |
Loans receivable | 1,012,014 | 987,066 |  |
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 | 1,237 | 1,154 |  |
Allowance for Loan Losses, Total | 1,237 | 1,154 | 1,135 | 1,163
Recorded Investment in Loans, Individually Evaluated for Impairment | 582 | 407 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 128,569 | 119,528 |  |
Loans receivable | 129,151 | 119,935 |  |
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 | 748 | 765 |  |
Allowance for Loan Losses, Total | 748 | 765 | 757 | 718
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 | 0 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 84,180 | 87,563 |  |
Loans receivable | 84,180 | 87,563 |  |
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 | 6,807 | 6,813 |  |
Allowance for Loan Losses, Total | 6,807 | 6,813 | 7,136 | 7,144
Recorded Investment in Loans, Individually Evaluated for Impairment | 3,037 | 3,143 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 494,324 | 467,507 |  |
Loans receivable | 497,361 | 470,650 |  |
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 | 671 | 644 |  |
Allowance for Loan Losses, Total | 671 | 644 | 770 | 832
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 | 0 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 63,748 | 61,003 |  |
Loans receivable | 63,748 | 61,003 |  |
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 | 153 | 188 |  |
Allowance for Loan Losses, Total | 153 | 188 | 182 | 158
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 | 0 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 8,760 | 9,657 |  |
Loans receivable | 8,760 | 9,657 |  |
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 | 593 | 784 |  |
Allowance for Loan Losses, Total | 593 | 784 | 558 | 420
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 | 0 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 32,290 | 38,931 |  |
Loans receivable | 32,290 | 38,931 |  |
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 | 460 | 436 |  |
Allowance for Loan Losses, Total | 460 | 436 | 186 | 238
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 | 0 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 27,122 | 22,888 |  |
Loans receivable | 27,122 | 22,888 |  |
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 | 157 | 124 |  |
Allowance for Loan Losses, Total | 157 | 124 | 123 | 133
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 | 0 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 7,594 | 5,502 |  |
Loans receivable | 7,594 | 5,502 |  |
Mortgage loans, land |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | 78 | 76 |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 357 | 394 |  |
Allowance for Loan Losses, Total | 435 | 470 | 474 | 572
Recorded Investment in Loans, Individually Evaluated for Impairment | 675 | 683 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 17,893 | 19,253 |  |
Loans receivable | 18,568 | 19,936 |  |
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 | 532 | 528 |  |
Allowance for Loan Losses, Total | 532 | 528 | 605 | 593
Recorded Investment in Loans, Individually Evaluated for Impairment | 456 | 516 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 33,919 | 32,472 |  |
Loans receivable | 34,375 | 32,988 |  |
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 | 48 | 50 |  |
Allowance for Loan Losses, Total | 48 | 50 | 57 | 71
Recorded Investment in Loans, Individually Evaluated for Impairment | 5 | 17 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 2,457 | 2,495 |  |
Loans receivable | 2,462 | 2,512 |  |
Commercial business loans |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | 176 | 171 |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 1,451 | 1,342 |  |
Allowance for Loan Losses, Total | 1,627 | 1,513 | $ 1,449 | $ 1,372
Recorded Investment in Loans, Individually Evaluated for Impairment | 459 | 458 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 84,547 | 74,121 |  |
Loans receivable | 85,006 | 74,579 |  |
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 | 21,397 | 40,922 |  |
Loans receivable | $ 21,397 | $ 40,922 |  |

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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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