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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, 2023 | Sep. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022
--- | --- | --- | --- | ---
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 | $ 16,655 | 15,817 | $ 14,229 | $ 13,703
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 |  |
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 | 2,096 | 2,417 | 1,888 | 1,658
Recorded Investment in Loans, Individually Evaluated for Impairment |  | 368 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment |  | 252,859 |  |
Loans receivable |  | 253,227 |  |
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 | 1,200 | 1,156 | 871 | 855
Recorded Investment in Loans, Individually Evaluated for Impairment |  | 0 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment |  | 127,176 |  |
Loans receivable |  | 127,176 |  |
Commercial real estate |  |  |  |
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 | 6,822 | 7,209 | 6,794 | 6,682
Recorded Investment in Loans, Individually Evaluated for Impairment |  | 2,973 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment |  | 565,292 |  |
Loans receivable |  | 568,265 |  |
Construction-custom & 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 | 1,234 | 750 | 673 | 675
Recorded Investment in Loans, Individually Evaluated for Impairment |  | 0 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment |  | 73,239 |  |
Loans receivable |  | 73,239 |  |
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 | 132 | 148 | 125 | 130
Recorded Investment in Loans, Individually Evaluated for Impairment |  | 0 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment |  | 9,361 |  |
Loans receivable |  | 9,361 |  |
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 | 430 | 316 | 323 | 343
Recorded Investment in Loans, Individually Evaluated for Impairment |  | 0 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment |  | 26,030 |  |
Loans receivable |  | 26,030 |  |
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 | 735 | 602 | 577 | 447
Recorded Investment in Loans, Individually Evaluated for Impairment |  | 0 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment |  | 45,890 |  |
Loans receivable |  | 45,890 |  |
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 | 298 | 274 | 222 | 233
Recorded Investment in Loans, Individually Evaluated for Impairment |  | 0 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment |  | 16,129 |  |
Loans receivable |  | 16,129 |  |
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 | 757 | 406 | 383 | 397
Recorded Investment in Loans, Individually Evaluated for Impairment |  | 0 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment |  | 26,726 |  |
Loans receivable |  | 26,726 |  |
Home equity |  |  |  |
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 | 286 | 519 | 493 | 440
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 | 46 | 53 | 47 | 42
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 |  |  |  |
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 | $ 2,619 | 1,967 | $ 1,833 | $ 1,801
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 |  |  |  |
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 The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 11B -Subparagraph (g) -SubTopic 10 -Topic 310 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-11B + Details
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- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 11B -Subparagraph (g) -SubTopic 10 -Topic 310 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-11B + Details
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