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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 | Mar. 31, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | 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 | 14,575 |  | 13,576 |  |  |
Allowance for Loan Losses, Total | 14,698 | $ 14,229 | 13,703 | $ 13,433 | $ 13,468 | $ 13,469
Recorded Investment in Loans, Individually Evaluated for Impairment | 4,518 |  | 4,532 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 1,225,132 |  | 1,145,918 |  |  |
Loans receivable | 1,229,650 |  | 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 | 2,052 |  | 1,658 |  |  |
Allowance for Loan Losses, Total | 2,052 | 1,888 | 1,658 | 1,247 | 1,237 | 1,154
Recorded Investment in Loans, Individually Evaluated for Impairment | 378 |  | 388 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 216,261 |  | 175,728 |  |  |
Loans receivable | 216,639 |  | 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 | 938 |  | 855 |  |  |
Allowance for Loan Losses, Total | 938 | 871 | 855 | 735 | 748 | 765
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 |  | 0 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 103,870 |  | 95,025 |  |  |
Loans receivable | 103,870 |  | 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 | 6,904 |  | 6,682 |  |  |
Allowance for Loan Losses, Total | 6,904 | 6,794 | 6,682 | 6,931 | 6,807 | 6,813
Recorded Investment in Loans, Individually Evaluated for Impairment | 3,006 |  | 2,988 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 544,870 |  | 533,662 |  |  |
Loans receivable | 547,876 |  | 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 | 726 |  | 675 |  |  |
Allowance for Loan Losses, Total | 726 | 673 | 675 | 686 | 671 | 644
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 |  | 0 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 71,750 |  | 67,091 |  |  |
Loans receivable | 71,750 |  | 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 | 121 |  | 130 |  |  |
Allowance for Loan Losses, Total | 121 | 125 | 130 | 126 | 153 | 188
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 |  | 0 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 7,785 |  | 8,364 |  |  |
Loans receivable | 7,785 |  | 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 | 267 |  | 343 |  |  |
Allowance for Loan Losses, Total | 267 | 323 | 343 | 463 | 593 | 784
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 |  | 0 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 23,145 |  | 29,059 |  |  |
Loans receivable | 23,145 |  | 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 | 662 |  | 447 |  |  |
Allowance for Loan Losses, Total | 662 | 577 | 447 | 436 | 460 | 436
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 |  | 0 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 50,758 |  | 34,354 |  |  |
Loans receivable | 50,758 |  | 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 | 245 |  | 233 |  |  |
Allowance for Loan Losses, Total | 245 | 222 | 233 | 126 | 157 | 124
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 |  | 0 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 14,250 |  | 13,582 |  |  |
Loans receivable | 14,250 |  | 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 | 363 |  | 397 |  |  |
Allowance for Loan Losses, Total | 363 | 383 | 397 | 377 | 435 | 470
Recorded Investment in Loans, Individually Evaluated for Impairment | 459 |  | 450 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 24,061 |  | 26,404 |  |  |
Loans receivable | 24,520 |  | 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 | 507 |  | 440 |  |  |
Allowance for Loan Losses, Total | 507 | 493 | 440 | 469 | 532 | 528
Recorded Investment in Loans, Individually Evaluated for Impairment | 381 |  | 394 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 36,515 |  | 34,793 |  |  |
Loans receivable | 36,896 |  | 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 | 47 |  | 42 |  |  |
Allowance for Loan Losses, Total | 47 | 47 | 42 | 44 | 48 | 50
Recorded Investment in Loans, Individually Evaluated for Impairment | 1 |  | 3 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 2,282 |  | 2,125 |  |  |
Loans receivable | 2,283 |  | 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 | 1,743 |  | 1,674 |  |  |
Allowance for Loan Losses, Total | 1,866 | $ 1,833 | 1,801 | $ 1,793 | $ 1,627 | $ 1,513
Recorded Investment in Loans, Individually Evaluated for Impairment | 293 |  | 309 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 129,013 |  | 124,730 |  |  |
Loans receivable | 129,306 |  | 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 | 572 |  | 1,001 |  |  |
Loans receivable | $ 572 |  | $ 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://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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