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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, 2022 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
--- | --- | --- | --- | ---
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | $ 127 | $ 247 |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 13,576 | 13,222 |  |
Allowance for Loan Losses, Total | 13,703 | 13,469 | $ 13,414 | $ 9,690
Recorded Investment in Loans, Individually Evaluated for Impairment | 4,532 | 5,224 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 1,145,918 | 981,842 |  |
Loans receivable | 1,150,450 | 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 | 1,658 | 1,154 |  |
Allowance for Loan Losses, Total | 1,658 | 1,154 | 1,163 | 1,167
Recorded Investment in Loans, Individually Evaluated for Impairment | 388 | 407 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 175,728 | 119,528 |  |
Loans receivable | 176,116 | 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 | 855 | 765 |  |
Allowance for Loan Losses, Total | 855 | 765 | 718 | 481
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 | 0 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 95,025 | 87,563 |  |
Loans receivable | 95,025 | 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 | 6,682 | 6,813 |  |
Allowance for Loan Losses, Total | 6,682 | 6,813 | 7,144 | 4,154
Recorded Investment in Loans, Individually Evaluated for Impairment | 2,988 | 3,143 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 533,662 | 467,507 |  |
Loans receivable | 536,650 | 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 | 675 | 644 |  |
Allowance for Loan Losses, Total | 675 | 644 | 832 | 755
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 | 0 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 67,091 | 61,003 |  |
Loans receivable | 67,091 | 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 | 130 | 188 |  |
Allowance for Loan Losses, Total | 130 | 188 | 158 | 212
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 | 0 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 8,364 | 9,657 |  |
Loans receivable | 8,364 | 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 | 343 | 784 |  |
Allowance for Loan Losses, Total | 343 | 784 | 420 | 338
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 | 0 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 29,059 | 38,931 |  |
Loans receivable | 29,059 | 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 | 447 | 436 |  |
Allowance for Loan Losses, Total | 447 | 436 | 238 | 375
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 | 0 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 34,354 | 22,888 |  |
Loans receivable | 34,354 | 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 | 233 | 124 |  |
Allowance for Loan Losses, Total | 233 | 124 | 133 | 67
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 | 0 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 13,582 | 5,502 |  |
Loans receivable | 13,582 | 5,502 |  |
Mortgage loans, land |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | 0 | 76 |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 397 | 394 |  |
Allowance for Loan Losses, Total | 397 | 470 | 572 | 697
Recorded Investment in Loans, Individually Evaluated for Impairment | 450 | 683 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 26,404 | 19,253 |  |
Loans receivable | 26,854 | 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 | 440 | 528 |  |
Allowance for Loan Losses, Total | 440 | 528 | 593 | 623
Recorded Investment in Loans, Individually Evaluated for Impairment | 394 | 516 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 34,793 | 32,472 |  |
Loans receivable | 35,187 | 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 | 42 | 50 |  |
Allowance for Loan Losses, Total | 42 | 50 | 71 | 99
Recorded Investment in Loans, Individually Evaluated for Impairment | 3 | 17 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 2,125 | 2,495 |  |
Loans receivable | 2,128 | 2,512 |  |
Commercial business loans |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | 127 | 171 |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 1,674 | 1,342 |  |
Allowance for Loan Losses, Total | 1,801 | 1,513 | $ 1,372 | $ 722
Recorded Investment in Loans, Individually Evaluated for Impairment | 309 | 458 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 124,730 | 74,121 |  |
Loans receivable | 125,039 | 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 | 1,001 | 40,922 |  |
Loans receivable | $ 1,001 | $ 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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