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Loans Receivable And Allowance For Loan Losses: Past Due Status of Loans (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Sep. 30, 2018
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Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | $ 3,575 | $ 2,556
Loans receivable, Non-Accrual | [1] | 2,745 | 1,317
Loans receivable, Current |  | 882,306 | 735,002
Loans receivable |  | 885,881 | 737,558
Mortgage loans, one-to-four family |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 568 | 1,102
Loans receivable, Non-Accrual | [1] | 568 | 545
Loans receivable, Current |  | 129,845 | 114,839
Loans receivable |  | 130,413 | 115,941
Mortgage loans, multi-family |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 0
Loans receivable, Non-Accrual | [1] | 0 | 0
Loans receivable, Current |  | 74,816 | 61,928
Loans receivable |  | 74,816 | 61,928
Mortgage loans, commercial |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 1,300 | 574
Loans receivable, Non-Accrual | [1] | 844 | 0
Loans receivable, Current |  | 415,923 | 344,539
Loans receivable |  | 417,223 | 345,113
Mortgage loans, construction - custom and owner/builder |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 0
Loans receivable, Non-Accrual | [1] | 0 | 0
Loans receivable, Current |  | 66,622 | 67,024
Loans receivable |  | 66,622 | 67,024
Mortgage loans, construction - speculative one-to-four family |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 0
Loans receivable, Non-Accrual | [1] | 0 | 0
Loans receivable, Current |  | 11,296 | 7,107
Loans receivable |  | 11,296 | 7,107
Mortgage loans, construction – commercial |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 0
Loans receivable, Non-Accrual | [1] | 0 | 0
Loans receivable, Current |  | 27,752 | 23,440
Loans receivable |  | 27,752 | 23,440
Mortgage loans, construction - Multi-family |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 0
Loans receivable, Non-Accrual | [1] | 0 | 0
Loans receivable, Current |  | 13,595 | 5,983
Loans receivable |  | 13,595 | 5,983
Mortgage loans, construction - Land development |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 228 | 0
Loans receivable, Non-Accrual | [1] | 0 | 0
Loans receivable, Current |  | 7,177 | 1,567
Loans receivable |  | 7,405 | 1,567
Mortgage loans, land |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 472 | 283
Loans receivable, Non-Accrual | [1] | 461 | 243
Loans receivable, Current |  | 21,999 | 25,263
Loans receivable |  | 22,471 | 25,546
Consumer loans, home equity and second mortgage |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 378 | 401
Loans receivable, Non-Accrual | [1] | 342 | 359
Loans receivable, Current |  | 41,231 | 36,940
Loans receivable |  | 41,609 | 37,341
Consumer loans, other |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 15 | 26
Loans receivable, Non-Accrual | [1] | 15 | 0
Loans receivable, Current |  | 4,590 | 3,489
Loans receivable |  | 4,605 | 3,515
Commercial business loans |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 614 | 170
Loans receivable, Non-Accrual | [1] | 515 | 170
Loans receivable, Current |  | 67,460 | 42,883
Loans receivable |  | 68,074 | 43,053
30 to 59 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 794 | 1,223
30 to 59 Days Past Due | Mortgage loans, one-to-four family |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 557
30 to 59 Days Past Due | Mortgage loans, multi-family |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 0
30 to 59 Days Past Due | Mortgage loans, commercial |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 456 | 574
30 to 59 Days Past Due | Mortgage loans, construction - custom and owner/builder |  |  |
Financing Receivable, Recorded Investment, 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, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 0
30 to 59 Days Past Due | Mortgage loans, construction – commercial |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 0
30 to 59 Days Past Due | Mortgage loans, construction - Multi-family |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 0
30 to 59 Days Past Due | Mortgage loans, construction - Land development |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 228 | 0
30 to 59 Days Past Due | Mortgage loans, land |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 11 | 40
30 to 59 Days Past Due | Consumer loans, home equity and second mortgage |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 42
30 to 59 Days Past Due | Consumer loans, other |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 10
30 to 59 Days Past Due | Commercial business loans |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 99 | 0
60 to 89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 36 | 16
60 to 89 Days Past Due | Mortgage loans, one-to-four family |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 0
60 to 89 Days Past Due | Mortgage loans, multi-family |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 0
60 to 89 Days Past Due | Mortgage loans, commercial |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 0
60 to 89 Days Past Due | Mortgage loans, construction - custom and owner/builder |  |  |
Financing Receivable, Recorded Investment, 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, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 0
60 to 89 Days Past Due | Mortgage loans, construction – commercial |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 0
60 to 89 Days Past Due | Mortgage loans, construction - Multi-family |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 0
60 to 89 Days Past Due | Mortgage loans, construction - Land development |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 0
60 to 89 Days Past Due | Mortgage loans, land |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 0
60 to 89 Days Past Due | Consumer loans, home equity and second mortgage |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 36 | 0
60 to 89 Days Past Due | Consumer loans, other |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 16
60 to 89 Days Past Due | Commercial business loans |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans receivable, Total Past Due |  | 0 | 0
Past Due 90 Days or More and Still Accruing |  |  |
Financing Receivable, Recorded Investment, 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, Recorded Investment, 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, Recorded Investment, 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, Recorded Investment, 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, Recorded Investment, 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, Recorded Investment, 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, Recorded Investment, 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, Recorded Investment, 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, Recorded Investment, 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, Recorded Investment, 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, Recorded Investment, 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, Recorded Investment, 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, Recorded Investment, 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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- Definition Financing receivables that are current. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953401-111524 + Details
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- Definition Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5111-111524 + Details
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