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Loans Receivable And Allowance For Loan Losses: Past Due Status of Loans (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Sep. 30, 2019
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Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | $ 3,552 | $ 3,925
Loans receivable, Non-Accrual | [1] | 3,015 | 3,033
Loans receivable, Current |  | 1,028,824 | 895,225
Loans receivable |  | 1,032,376 | 899,150
Mortgage loans, one-to-four family |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 927 | 985
Loans receivable, Non-Accrual | [1] | 927 | 699
Loans receivable, Current |  | 119,587 | 131,676
Loans receivable |  | 120,514 | 132,661
Mortgage loans, multi-family |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 0
Loans receivable, Non-Accrual | [1] | 0 | 0
Loans receivable, Current |  | 79,468 | 76,036
Loans receivable |  | 79,468 | 76,036
Mortgage loans, commercial |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 1,412 | 1,091
Loans receivable, Non-Accrual | [1] | 875 | 779
Loans receivable, Current |  | 454,042 | 418,026
Loans receivable |  | 455,454 | 419,117
Mortgage loans, construction - custom and owner/builder |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 0
Loans receivable, Non-Accrual | [1] | 0 | 0
Loans receivable, Current |  | 73,011 | 75,411
Loans receivable |  | 73,011 | 75,411
Mortgage loans, construction - speculative one-to-four family |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 0
Loans receivable, Non-Accrual | [1] | 0 | 0
Loans receivable, Current |  | 7,412 | 10,779
Loans receivable |  | 7,412 | 10,779
Mortgage loans, construction – commercial |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 0
Loans receivable, Non-Accrual | [1] | 0 | 0
Loans receivable, Current |  | 19,793 | 24,051
Loans receivable |  | 19,793 | 24,051
Mortgage loans, construction - Multi-family |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 0
Loans receivable, Non-Accrual | [1] | 0 | 0
Loans receivable, Current |  | 14,430 | 19,256
Loans receivable |  | 14,430 | 19,256
Mortgage loans, construction - Land development |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 0
Loans receivable, Non-Accrual | [1] | 0 | 0
Loans receivable, Current |  | 3,161 | 1,803
Loans receivable |  | 3,161 | 1,803
Mortgage loans, land |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 185 | 402
Loans receivable, Non-Accrual | [1] | 185 | 204
Loans receivable, Current |  | 26,824 | 30,368
Loans receivable |  | 27,009 | 30,770
Consumer loans, home equity and second mortgage |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 586 | 697
Loans receivable, Non-Accrual | [1] | 586 | 603
Loans receivable, Current |  | 33,819 | 39,493
Loans receivable |  | 34,405 | 40,190
Consumer loans, other |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 10 | 23
Loans receivable, Non-Accrual | [1] | 10 | 23
Loans receivable, Current |  | 3,542 | 4,289
Loans receivable |  | 3,552 | 4,312
Commercial business loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 432 | 727
Loans receivable, Non-Accrual | [1] | 432 | 725
Loans receivable, Current |  | 71,154 | 64,037
Loans receivable |  | 71,586 | 64,764
SBA PPP Loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 |
Loans receivable, Non-Accrual |  | 0 |
Loans receivable, Current |  | 122,581 |
Loans receivable |  | 122,581 |
30 to 59 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 193
30 to 59 Days Past Due | Mortgage loans, one-to-four family |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 0
30 to 59 Days Past Due | Mortgage loans, multi-family |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 0
30 to 59 Days Past Due | Mortgage loans, commercial |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 94
30 to 59 Days Past Due | Mortgage loans, construction - custom and owner/builder |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 0
30 to 59 Days Past Due | Mortgage loans, construction - speculative one-to-four family |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 0
30 to 59 Days Past Due | Mortgage loans, construction – commercial |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 0
30 to 59 Days Past Due | Mortgage loans, construction - Multi-family |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 0
30 to 59 Days Past Due | Mortgage loans, construction - Land development |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 0
30 to 59 Days Past Due | Mortgage loans, land |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 5
30 to 59 Days Past Due | Consumer loans, home equity and second mortgage |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 94
30 to 59 Days Past Due | Consumer loans, other |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 0
30 to 59 Days Past Due | Commercial business loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 0
30 to 59 Days Past Due | SBA PPP Loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 |
60 to 89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 537 | 699
60 to 89 Days Past Due | Mortgage loans, one-to-four family |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 286
60 to 89 Days Past Due | Mortgage loans, multi-family |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 0
60 to 89 Days Past Due | Mortgage loans, commercial |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 537 | 218
60 to 89 Days Past Due | Mortgage loans, construction - custom and owner/builder |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 0
60 to 89 Days Past Due | Mortgage loans, construction - speculative one-to-four family |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 0
60 to 89 Days Past Due | Mortgage loans, construction – commercial |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 0
60 to 89 Days Past Due | Mortgage loans, construction - Multi-family |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 0
60 to 89 Days Past Due | Mortgage loans, construction - Land development |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 0
60 to 89 Days Past Due | Mortgage loans, land |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 193
60 to 89 Days Past Due | Consumer loans, home equity and second mortgage |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 0
60 to 89 Days Past Due | Consumer loans, other |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 0
60 to 89 Days Past Due | Commercial business loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 2
60 to 89 Days Past Due | SBA PPP Loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 |
Past Due 90 Days or More and Still Accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 0
Past Due 90 Days or More and Still Accruing | Mortgage loans, one-to-four family |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 0
Past Due 90 Days or More and Still Accruing | Mortgage loans, multi-family |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 0
Past Due 90 Days or More and Still Accruing | Mortgage loans, commercial |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 0
Past Due 90 Days or More and Still Accruing | Mortgage loans, construction - custom and owner/builder |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 0
Past Due 90 Days or More and Still Accruing | Mortgage loans, construction - speculative one-to-four family |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 0
Past Due 90 Days or More and Still Accruing | Mortgage loans, construction – commercial |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 0
Past Due 90 Days or More and Still Accruing | Mortgage loans, construction - Multi-family |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 0
Past Due 90 Days or More and Still Accruing | Mortgage loans, construction - Land development |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 0
Past Due 90 Days or More and Still Accruing | Mortgage loans, land |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 0
Past Due 90 Days or More and Still Accruing | Consumer loans, home equity and second mortgage |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 0
Past Due 90 Days or More and Still Accruing | Consumer loans, other |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 0
Past Due 90 Days or More and Still Accruing | Commercial business loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | $ 0
Past Due 90 Days or More and Still Accruing | SBA PPP Loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | $ 0 |
[1] | Includes non-accrual loans past due 90 days or more and other loans classified as non-accrual.

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