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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, 2023 | Mar. 31, 2023 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Sep. 30, 2021
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Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | $ 123 |  | $ 127 |  |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 15,184 |  | 13,576 |  |  |
Allowance for Loan Losses, Total | 15,307 | $ 14,698 | 13,703 | $ 13,433 | $ 13,433 | $ 13,469
Recorded Investment in Loans, Individually Evaluated for Impairment | 4,190 |  | 4,532 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 1,276,721 |  | 1,145,918 |  |  |
Loans receivable | 1,280,911 |  | 1,150,450 |  |  |
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 | 2,178 |  | 1,658 |  |  |
Allowance for Loan Losses, Total | 2,178 | 2,052 | 1,658 | 1,356 | 1,247 | 1,154
Recorded Investment in Loans, Individually Evaluated for Impairment | 373 |  | 388 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 228,901 |  | 175,728 |  |  |
Loans receivable | 229,274 |  | 176,116 |  |  |
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 | 1,012 |  | 855 |  |  |
Allowance for Loan Losses, Total | 1,012 | 938 | 855 | 888 | 735 | 765
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 |  | 0 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 111,777 |  | 95,025 |  |  |
Loans receivable | 111,777 |  | 95,025 |  |  |
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 | 7,029 |  | 6,682 |  |  |
Allowance for Loan Losses, Total | 7,029 | 6,904 | 6,682 | 6,763 | 6,931 | 6,813
Recorded Investment in Loans, Individually Evaluated for Impairment | 2,988 |  | 2,988 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 554,027 |  | 533,662 |  |  |
Loans receivable | 557,015 |  | 536,650 |  |  |
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 | 799 |  | 675 |  |  |
Allowance for Loan Losses, Total | 799 | 726 | 675 | 733 | 686 | 644
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 |  | 0 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 78,739 |  | 67,091 |  |  |
Loans receivable | 78,739 |  | 67,091 |  |  |
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 | 110 |  | 130 |  |  |
Allowance for Loan Losses, Total | 110 | 121 | 130 | 93 | 126 | 188
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 |  | 0 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 7,037 |  | 8,364 |  |  |
Loans receivable | 7,037 |  | 8,364 |  |  |
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 | 291 |  | 343 |  |  |
Allowance for Loan Losses, Total | 291 | 267 | 343 | 354 | 463 | 784
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 |  | 0 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 24,300 |  | 29,059 |  |  |
Loans receivable | 24,300 |  | 29,059 |  |  |
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 | 692 |  | 447 |  |  |
Allowance for Loan Losses, Total | 692 | 662 | 447 | 328 | 436 | 436
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 |  | 0 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 52,941 |  | 34,354 |  |  |
Loans receivable | 52,941 |  | 34,354 |  |  |
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 | 233 |  | 233 |  |  |
Allowance for Loan Losses, Total | 233 | 245 | 233 | 239 | 126 | 124
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 |  | 0 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 13,810 |  | 13,582 |  |  |
Loans receivable | 13,810 |  | 13,582 |  |  |
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 | 389 |  | 397 |  |  |
Allowance for Loan Losses, Total | 389 | 363 | 397 | 360 | 377 | 470
Recorded Investment in Loans, Individually Evaluated for Impairment | 150 |  | 450 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 25,758 |  | 26,404 |  |  |
Loans receivable | 25,908 |  | 26,854 |  |  |
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 | 542 |  | 440 |  |  |
Allowance for Loan Losses, Total | 542 | 507 | 440 | 434 | 469 | 528
Recorded Investment in Loans, Individually Evaluated for Impairment | 390 |  | 394 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 39,618 |  | 34,793 |  |  |
Loans receivable | 40,008 |  | 35,187 |  |  |
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 | 51 |  | 42 |  |  |
Allowance for Loan Losses, Total | 51 | 47 | 42 | 51 | 44 | 50
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 |  | 3 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 2,469 |  | 2,125 |  |  |
Loans receivable | 2,469 |  | 2,128 |  |  |
Commercial business loans |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | 123 |  | 127 |  |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 1,858 |  | 1,674 |  |  |
Allowance for Loan Losses, Total | 1,981 | $ 1,866 | 1,801 | $ 1,834 | $ 1,793 | $ 1,513
Recorded Investment in Loans, Individually Evaluated for Impairment | 289 |  | 309 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 136,825 |  | 124,730 |  |  |
Loans receivable | 137,114 |  | 125,039 |  |  |
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 | 519 |  | 1,001 |  |  |
Loans receivable | $ 519 |  | $ 1,001 |  |  |

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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://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(4)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (a) -Subparagraph (1) -Publisher SEC Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (a) -Subparagraph (3) -Publisher SEC Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (c) -Publisher SEC Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479344/326-20-45-1 Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)(2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 11B -Subparagraph (c)(1) -SubTopic 10 -Topic 310 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-11B Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-13 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-13 + Details
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