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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, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019
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Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | $ 73 |  | $ 41 |  |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 13,361 |  | 13,373 |  |  |
Allowance for Loan Losses, Total | 13,434 | $ 13,432 | 13,414 | $ 11,890 | $ 9,882 | $ 9,690
Recorded Investment in Loans, Individually Evaluated for Impairment | 5,169 |  | 5,773 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 1,045,947 |  | 1,027,952 |  |  |
Loans receivable | 1,051,116 |  | 1,033,725 |  |  |
Mortgage loans, one-to-four family |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | 0 |  | 3 |  |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 1,151 |  | 1,160 |  |  |
Allowance for Loan Losses, Total | 1,151 | 1,135 | 1,163 | 1,149 | 1,065 | 1,167
Recorded Investment in Loans, Individually Evaluated for Impairment | 896 |  | 1,143 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 116,288 |  | 117,437 |  |  |
Loans receivable | 117,184 |  | 118,580 |  |  |
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 | 784 |  | 718 |  |  |
Allowance for Loan Losses, Total | 784 | 757 | 718 | 595 | 499 | 481
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 |  | 0 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 92,435 |  | 85,053 |  |  |
Loans receivable | 92,435 |  | 85,053 |  |  |
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 | 7,238 |  | 7,144 |  |  |
Allowance for Loan Losses, Total | 7,238 | 7,136 | 7,144 | 5,762 | 4,410 | 4,154
Recorded Investment in Loans, Individually Evaluated for Impairment | 3,028 |  | 3,242 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 458,938 |  | 450,332 |  |  |
Loans receivable | 461,966 |  | 453,574 |  |  |
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 | 695 |  | 832 |  |  |
Allowance for Loan Losses, Total | 695 | 770 | 832 | 697 | 754 | 755
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 |  | 0 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 62,973 |  | 75,332 |  |  |
Loans receivable | 62,973 |  | 75,332 |  |  |
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 | 148 |  | 158 |  |  |
Allowance for Loan Losses, Total | 148 | 182 | 158 | 204 | 248 | 212
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 |  | 0 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 7,336 |  | 7,108 |  |  |
Loans receivable | 7,336 |  | 7,108 |  |  |
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 | 714 |  | 420 |  |  |
Allowance for Loan Losses, Total | 714 | 558 | 420 | 423 | 403 | 338
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 |  | 0 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 34,217 |  | 20,927 |  |  |
Loans receivable | 34,217 |  | 20,927 |  |  |
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 | 323 |  | 238 |  |  |
Allowance for Loan Losses, Total | 323 | 186 | 238 | 394 | 333 | 375
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 |  | 0 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 15,739 |  | 10,832 |  |  |
Loans receivable | 15,739 |  | 10,832 |  |  |
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 | 19 |  | 133 |  |  |
Allowance for Loan Losses, Total | 19 | 123 | 133 | 80 | 48 | 67
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 |  | 0 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 623 |  | 4,739 |  |  |
Loans receivable | 623 |  | 4,739 |  |  |
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 | 407 |  | 572 |  |  |
Allowance for Loan Losses, Total | 407 | 474 | 572 | 678 | 654 | 697
Recorded Investment in Loans, Individually Evaluated for Impairment | 173 |  | 394 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 18,868 |  | 25,177 |  |  |
Loans receivable | 19,041 |  | 25,571 |  |  |
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 | 552 |  | 593 |  |  |
Allowance for Loan Losses, Total | 552 | 605 | 593 | 656 | 609 | 623
Recorded Investment in Loans, Individually Evaluated for Impairment | 537 |  | 555 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 31,489 |  | 31,522 |  |  |
Loans receivable | 32,026 |  | 32,077 |  |  |
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 | 56 |  | 71 |  |  |
Allowance for Loan Losses, Total | 56 | 57 | 71 | 78 | 87 | 99
Recorded Investment in Loans, Individually Evaluated for Impairment | 8 |  | 9 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 2,748 |  | 3,563 |  |  |
Loans receivable | 2,756 |  | 3,572 |  |  |
Commercial business loans |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | 73 |  | 38 |  |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 1,274 |  | 1,334 |  |  |
Allowance for Loan Losses, Total | 1,347 | 1,449 | 1,372 | $ 1,174 | $ 772 | $ 722
Recorded Investment in Loans, Individually Evaluated for Impairment | 527 |  | 430 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 66,118 |  | 69,110 |  |  |
Loans receivable | 66,645 |  | 69,540 |  |  |
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 | 0 |  |  |
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 |  | 0 |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 138,175 |  | 126,820 |  |  |
Loans receivable | $ 138,175 |  | $ 126,820 |  |  |

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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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