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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 | Dec. 31, 2018 | Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017
--- | --- | --- | --- | ---
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | $ 137 | $ 97 |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 9,396 | 9,433 |  |
Allowance for Loan Losses, Total | 9,533 | 9,530 | $ 9,565 | $ 9,553
Recorded Investment in Loans, Individually Evaluated for Impairment | 4,531 | 4,272 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 864,947 | 733,286 |  |
Loans receivable | 869,478 | 737,558 |  |
Mortgage loans, one-to-four family |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | 0 | 0 |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 1,159 | 1,086 |  |
Allowance for Loan Losses, Total | 1,159 | 1,086 | 1,125 | 1,082
Recorded Investment in Loans, Individually Evaluated for Impairment | 1,014 | 1,054 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 129,205 | 114,887 |  |
Loans receivable | 130,219 | 115,941 |  |
Mortgage loans, multi-family |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | 0 | 0 |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 449 | 433 |  |
Allowance for Loan Losses, Total | 449 | 433 | 430 | 447
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 | 0 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 72,076 | 61,928 |  |
Loans receivable | 72,076 | 61,928 |  |
Mortgage loans, commercial |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | 0 | 0 |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 4,239 | 4,248 |  |
Allowance for Loan Losses, Total | 4,239 | 4,248 | 4,093 | 4,184
Recorded Investment in Loans, Individually Evaluated for Impairment | 2,436 | 2,446 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 423,708 | 342,667 |  |
Loans receivable | 426,144 | 345,113 |  |
Mortgage loans, construction - custom and owner/builder |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | 0 | 0 |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 643 | 671 |  |
Allowance for Loan Losses, Total | 643 | 671 | 788 | 699
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 | 0 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 64,313 | 67,024 |  |
Loans receivable | 64,313 | 67,024 |  |
Mortgage loans, construction - speculative one-to-four family |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | 0 | 0 |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 206 | 178 |  |
Allowance for Loan Losses, Total | 206 | 178 | 75 | 128
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 | 0 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 9,221 | 7,107 |  |
Loans receivable | 9,221 | 7,107 |  |
Mortgage loans, construction – commercial |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | 0 | 0 |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 386 | 563 |  |
Allowance for Loan Losses, Total | 386 | 563 | 396 | 303
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 | 0 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 25,883 | 23,440 |  |
Loans receivable | 25,883 | 23,440 |  |
Mortgage loans, construction - Multi-family |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | 0 | 0 |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 209 | 135 |  |
Allowance for Loan Losses, Total | 209 | 135 | 228 | 173
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 | 0 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 9,333 | 5,983 |  |
Loans receivable | 9,333 | 5,983 |  |
Mortgage loans, construction - Land development |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | 0 | 0 |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 143 | 49 |  |
Allowance for Loan Losses, Total | 143 | 49 |  |
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 | 0 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 6,442 | 1,567 |  |
Loans receivable | 6,442 | 1,567 |  |
Mortgage loans, land |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | 79 | 34 |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 678 | 810 |  |
Allowance for Loan Losses, Total | 757 | 844 | 780 | 918
Recorded Investment in Loans, Individually Evaluated for Impairment | 396 | 243 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 22,338 | 25,303 |  |
Loans receivable | 22,734 | 25,546 |  |
Consumer loans, home equity and second mortgage |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | 0 | 0 |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 666 | 649 |  |
Allowance for Loan Losses, Total | 666 | 649 | 958 | 983
Recorded Investment in Loans, Individually Evaluated for Impairment | 386 | 359 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 40,082 | 36,982 |  |
Loans receivable | 40,468 | 37,341 |  |
Consumer loans, other |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | 0 | 0 |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 101 | 117 |  |
Allowance for Loan Losses, Total | 101 | 117 | 129 | 121
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 | 0 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 4,443 | 3,515 |  |
Loans receivable | 4,443 | 3,515 |  |
Commercial business loans |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | 58 | 63 |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 517 | 494 |  |
Allowance for Loan Losses, Total | 575 | 557 | $ 563 | $ 515
Recorded Investment in Loans, Individually Evaluated for Impairment | 299 | 170 |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 57,903 | 42,883 |  |
Loans receivable | $ 58,202 | $ 43,053 |  |

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- Definition Loans Receivable, Including Loans Held-For-Sale and Loans in Process, Gross + References No definition available. + Details
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- Definition A valuation allowance for financing receivables that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition The balance of financing receivables that were collectively evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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