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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, 2024 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
--- | --- | --- | --- | ---
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment |  | $ 123 |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment |  | 15,694 |  |
Allowance for Loan Losses, Total | $ 17,478 | 15,817 | $ 13,703 | $ 13,469
Recorded Investment in Loans, Individually Evaluated for Impairment |  | 4,009 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment |  | 1,319,355 |  |
Loans receivable |  | 1,323,364 |  |
Mortgage loans, one-to-four family |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment |  | 0 |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment |  | 2,417 |  |
Allowance for Loan Losses, Total | 2,632 | 2,417 | 1,658 | 1,154
Recorded Investment in Loans, Individually Evaluated for Impairment |  | 368 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment |  | 252,859 |  |
Loans receivable |  | 253,227 |  |
Mortgage loans, multi-family |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment |  | 0 |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment |  | 1,156 |  |
Allowance for Loan Losses, Total | 1,308 | 1,156 | 855 | 765
Recorded Investment in Loans, Individually Evaluated for Impairment |  | 0 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment |  | 127,176 |  |
Loans receivable |  | 127,176 |  |
Mortgage loans, commercial |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment |  | 0 |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment |  | 7,209 |  |
Allowance for Loan Losses, Total | 6,934 | 7,209 | 6,682 | 6,813
Recorded Investment in Loans, Individually Evaluated for Impairment |  | 2,973 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment |  | 565,292 |  |
Loans receivable |  | 568,265 |  |
Mortgage loans, construction - custom and owner/builder |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment |  | 0 |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment |  | 750 |  |
Allowance for Loan Losses, Total | 1,328 | 750 | 675 | 644
Recorded Investment in Loans, Individually Evaluated for Impairment |  | 0 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment |  | 73,239 |  |
Loans receivable |  | 73,239 |  |
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 |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment |  | 148 |  |
Allowance for Loan Losses, Total | 128 | 148 | 130 | 188
Recorded Investment in Loans, Individually Evaluated for Impairment |  | 0 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment |  | 9,361 |  |
Loans receivable |  | 9,361 |  |
Mortgage loans, construction - commercial |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment |  | 0 |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment |  | 316 |  |
Allowance for Loan Losses, Total | 537 | 316 | 343 | 784
Recorded Investment in Loans, Individually Evaluated for Impairment |  | 0 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment |  | 26,030 |  |
Loans receivable |  | 26,030 |  |
Mortgage loans, construction - multi-family |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment |  | 0 |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment |  | 602 |  |
Allowance for Loan Losses, Total | 456 | 602 | 447 | 436
Recorded Investment in Loans, Individually Evaluated for Impairment |  | 0 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment |  | 45,890 |  |
Loans receivable |  | 45,890 |  |
Mortgage loans - construction - land development |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment |  | 0 |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment |  | 274 |  |
Allowance for Loan Losses, Total | 335 | 274 | 233 | 124
Recorded Investment in Loans, Individually Evaluated for Impairment |  | 0 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment |  | 16,129 |  |
Loans receivable |  | 16,129 |  |
Mortgage loans, land |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment |  | 0 |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment |  | 406 |  |
Allowance for Loan Losses, Total | 793 | 406 | 397 | 470
Recorded Investment in Loans, Individually Evaluated for Impairment |  | 0 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment |  | 26,726 |  |
Loans receivable |  | 26,726 |  |
Consumer loans, home equity and second mortgage |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment |  | 0 |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment |  | 519 |  |
Allowance for Loan Losses, Total | 348 | 519 | 440 | 528
Recorded Investment in Loans, Individually Evaluated for Impairment |  | 382 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment |  | 37,899 |  |
Loans receivable |  | 38,281 |  |
Consumer loans, other |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment |  | 0 |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment |  | 53 |  |
Allowance for Loan Losses, Total | 39 | 53 | 42 | 50
Recorded Investment in Loans, Individually Evaluated for Impairment |  | 0 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment |  | 2,772 |  |
Loans receivable |  | 2,772 |  |
Commercial business loans |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment |  | 123 |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment |  | 1,844 |  |
Allowance for Loan Losses, Total | $ 2,640 | 1,967 | $ 1,801 | $ 1,513
Recorded Investment in Loans, Individually Evaluated for Impairment |  | 286 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment |  | 135,516 |  |
Loans receivable |  | 135,802 |  |
SBA PPP Loans |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment |  | 0 |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment |  | 0 |  |
Allowance for Loan Losses, Total |  | 0 |  |
Recorded Investment in Loans, Individually Evaluated for Impairment |  | 0 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment |  | 466 |  |
Loans receivable |  | $ 466 |  |

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- Definition Loans Receivable, Including Loans Held-For-Sale and Loans in Process, Gross + References No definition available. + Details
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- Definition Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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 + Details
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- Definition Amount of allowance for credit loss on financing receivable evaluated on collective basis. Excludes financing receivable evaluated on individual basis. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 6.L.5.a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480418/310-10-S99-4 Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11B -Subparagraph (g) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481962/310-10-50-11B Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 30 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479391/326-20-30-2 + Details
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- Definition Amount of allowance for credit loss on financing receivable evaluated on individual basis. Excludes financing receivable evaluated on collective basis. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 6.L.5.a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480418/310-10-S99-4 Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11B -Subparagraph (g) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481962/310-10-50-11B Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 30 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479391/326-20-30-2 + Details
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