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Loans Receivable And Allowance For Loan Losses: Past Due Status of Loans (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Sep. 30, 2019
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Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | $ 3,433 | $ 3,925
Loans receivable, Non-Accrual | [1] | 3,216 | 3,033
Loans receivable, Current |  | 918,808 | 895,225
Loans receivable |  | 922,241 | 899,150
Mortgage loans, one-to-four family |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 941 | 985
Loans receivable, Non-Accrual | [1] | 941 | 699
Loans receivable, Current |  | 124,344 | 131,676
Loans receivable |  | 125,285 | 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 |  | 81,298 | 76,036
Loans receivable |  | 81,298 | 76,036
Mortgage loans, commercial |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 1,038 | 1,091
Loans receivable, Non-Accrual | [1] | 947 | 779
Loans receivable, Current |  | 443,238 | 418,026
Loans receivable |  | 444,276 | 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 |  | 69,298 | 75,411
Loans receivable |  | 69,298 | 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 |  | 9,507 | 10,779
Loans receivable |  | 9,507 | 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 |  | 25,803 | 24,051
Loans receivable |  | 25,803 | 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 |  | 18,753 | 19,256
Loans receivable |  | 18,753 | 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 |  | 2,265 | 1,803
Loans receivable |  | 2,265 | 1,803
Mortgage loans, land |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 193 | 402
Loans receivable, Non-Accrual | [1] | 193 | 204
Loans receivable, Current |  | 29,140 | 30,368
Loans receivable |  | 29,333 | 30,770
Consumer loans, home equity and second mortgage |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 581 | 697
Loans receivable, Non-Accrual | [1] | 581 | 603
Loans receivable, Current |  | 38,391 | 39,493
Loans receivable |  | 38,972 | 40,190
Consumer loans, other |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 12 | 23
Loans receivable, Non-Accrual | [1] | 11 | 23
Loans receivable, Current |  | 3,817 | 4,289
Loans receivable |  | 3,829 | 4,312
Commercial business loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 668 | 727
Loans receivable, Non-Accrual | [1] | 543 | 725
Loans receivable, Current |  | 72,954 | 64,037
Loans receivable |  | 73,622 | 64,764
30 to 59 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 217 | 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 |  | 91 | 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 |  | 1 | 0
30 to 59 Days Past Due | Commercial business loans |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 125 | 0
60 to 89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 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 |  | 0 | 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
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
[1] | Includes non-accrual loans past due 90 days or more and other loans classified as non-accrual.

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