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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, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018
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Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | $ 63 |  | $ 172 |  |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 12,831 |  | 9,518 |  |  |
Allowance for Loan Losses, Total | 12,894 | $ 11,890 | 9,690 | $ 9,631 | $ 9,741 | $ 9,530
Recorded Investment in Loans, Individually Evaluated for Impairment | 5,891 |  | 5,937 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 1,026,485 |  | 893,213 |  |  |
Loans receivable | 1,032,376 |  | 899,150 |  |  |
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 | 1,163 |  | 1,167 |  |  |
Allowance for Loan Losses, Total | 1,163 | 1,149 | 1,167 | 1,118 | 1,154 | 1,086
Recorded Investment in Loans, Individually Evaluated for Impairment | 1,410 |  | 1,192 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 119,104 |  | 131,469 |  |  |
Loans receivable | 120,514 |  | 132,661 |  |  |
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 | 665 |  | 481 |  |  |
Allowance for Loan Losses, Total | 665 | 595 | 481 | 438 | 470 | 433
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 |  | 0 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 79,468 |  | 76,036 |  |  |
Loans receivable | 79,468 |  | 76,036 |  |  |
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 | 6,719 |  | 4,154 |  |  |
Allowance for Loan Losses, Total | 6,719 | 5,762 | 4,154 | 4,052 | 4,122 | 4,248
Recorded Investment in Loans, Individually Evaluated for Impairment | 3,267 |  | 3,190 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 452,187 |  | 415,927 |  |  |
Loans receivable | 455,454 |  | 419,117 |  |  |
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 | 807 |  | 755 |  |  |
Allowance for Loan Losses, Total | 807 | 697 | 755 | 702 | 666 | 671
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 |  | 0 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 73,011 |  | 75,411 |  |  |
Loans receivable | 73,011 |  | 75,411 |  |  |
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 | 164 |  | 212 |  |  |
Allowance for Loan Losses, Total | 164 | 204 | 212 | 221 | 249 | 178
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 |  | 0 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 7,412 |  | 10,779 |  |  |
Loans receivable | 7,412 |  | 10,779 |  |  |
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 | 304 |  | 338 |  |  |
Allowance for Loan Losses, Total | 304 | 423 | 338 | 384 | 384 | 563
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 |  | 0 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 19,793 |  | 24,051 |  |  |
Loans receivable | 19,793 |  | 24,051 |  |  |
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 | 318 |  | 375 |  |  |
Allowance for Loan Losses, Total | 318 | 394 | 375 | 367 | 272 | 135
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 |  | 0 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 14,430 |  | 19,256 |  |  |
Loans receivable | 14,430 |  | 19,256 |  |  |
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 | 107 |  | 67 |  |  |
Allowance for Loan Losses, Total | 107 | 80 | 67 | 126 | 244 | 49
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 |  | 0 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 3,161 |  | 1,803 |  |  |
Loans receivable | 3,161 |  | 1,803 |  |  |
Mortgage loans, land |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | 25 |  | 27 |  |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 617 |  | 670 |  |  |
Allowance for Loan Losses, Total | 642 | 678 | 697 | 656 | 649 | 844
Recorded Investment in Loans, Individually Evaluated for Impairment | 186 |  | 204 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 26,823 |  | 30,566 |  |  |
Loans receivable | 27,009 |  | 30,770 |  |  |
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 | 632 |  | 623 |  |  |
Allowance for Loan Losses, Total | 632 | 656 | 623 | 645 | 667 | 649
Recorded Investment in Loans, Individually Evaluated for Impairment | 586 |  | 603 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 33,819 |  | 39,587 |  |  |
Loans receivable | 34,405 |  | 40,190 |  |  |
Consumer loans, other |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | 0 |  | 17 |  |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 73 |  | 82 |  |  |
Allowance for Loan Losses, Total | 73 | 78 | 99 | 87 | 112 | 117
Recorded Investment in Loans, Individually Evaluated for Impairment | 10 |  | 23 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 3,542 |  | 4,289 |  |  |
Loans receivable | 3,552 |  | 4,312 |  |  |
Commercial business loans |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | 38 |  | 128 |  |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 1,262 |  | 594 |  |  |
Allowance for Loan Losses, Total | 1,300 | $ 1,174 | 722 | $ 835 | $ 752 | $ 557
Recorded Investment in Loans, Individually Evaluated for Impairment | 432 |  | 725 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 71,154 |  | 64,039 |  |  |
Loans receivable | 71,586 |  | $ 64,764 |  |  |
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 | 122,581 |  |  |  |  |
Loans receivable | $ 122,581 |  |  |  |  |

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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=118936363&loc=SL6953423-111524 Reference 2: 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=118955202&loc=SL82895884-210446 Reference 3: 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=119407570&loc=SL82919249-210447 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 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=119407570&loc=SL82919249-210447 + Details
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