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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 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2017 | Mar. 31, 2015
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Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | $ 259 |  | $ 97 |  |  |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 9,372 |  | 9,433 |  |  |  |
Allowance for Loan Losses, Total | 9,631 | $ 9,741 | 9,530 | $ 9,532 | $ 9,544 | $ 9,553 |
Recorded Investment in Loans, Individually Evaluated for Impairment | 6,266 |  | 4,272 |  |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 880,185 |  | 733,286 |  |  |  |
Loans receivable | 886,451 |  | 737,558 |  |  |  |
Mortgage loans, 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 | 1,118 |  | 1,086 |  |  |  |
Allowance for Loan Losses, Total | 1,118 | 1,154 | 1,086 | 1,027 | 1,060 | 1,082 |
Recorded Investment in Loans, Individually Evaluated for Impairment | 1,220 |  | 1,054 |  |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 127,830 |  | 114,887 |  |  |  |
Loans receivable | 129,050 |  | 115,941 |  |  |  |
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 | 438 |  | 433 |  |  |  |
Allowance for Loan Losses, Total | 438 | 470 | 433 | 407 | 386 | 447 |
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 |  | 0 |  |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 70,374 |  | 61,928 |  |  |  |
Loans receivable | 70,374 |  | 61,928 |  |  |  |
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 | 4,052 |  | 4,248 |  |  |  |
Allowance for Loan Losses, Total | 4,052 | 4,122 | 4,248 | 4,183 | 4,198 | 4,184 |
Recorded Investment in Loans, Individually Evaluated for Impairment | 3,255 |  | 2,446 |  |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 415,523 |  | 342,667 |  |  |  |
Loans receivable | 418,778 |  | 345,113 |  |  |  |
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 | 702 |  | 671 |  |  |  |
Allowance for Loan Losses, Total | 702 | 666 | 671 | 667 | 705 | 699 |
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 |  | 0 |  |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 70,237 |  | 67,024 |  |  |  |
Loans receivable | 70,237 |  | 67,024 |  |  |  |
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 | 221 |  | 178 |  |  |  |
Allowance for Loan Losses, Total | 221 | 249 | 178 | 133 | 99 | 128 |
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 |  | 0 |  |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 10,545 |  | 7,107 |  |  |  |
Loans receivable | 10,545 |  | 7,107 |  |  |  |
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 | 384 |  | 563 |  |  |  |
Allowance for Loan Losses, Total | 384 | 384 | 563 | 519 | 445 | 303 |
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 |  | 0 |  |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 27,567 |  | 23,440 |  |  |  |
Loans receivable | 27,567 |  | 23,440 |  |  |  |
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 | 367 |  | 135 |  |  |  |
Allowance for Loan Losses, Total | 367 | 272 | 135 | 147 | 284 | 173 |
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 |  | 0 |  |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 18,418 |  | 5,983 |  |  |  |
Loans receivable | 18,418 |  | 5,983 |  |  |  |
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 | 126 |  | 49 |  |  |  |
Allowance for Loan Losses, Total | 126 | 244 | 49 | 80 | 48 |  | $ 0
Recorded Investment in Loans, Individually Evaluated for Impairment | 0 |  | 0 |  |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 2,990 |  | 1,567 |  |  |  |
Loans receivable | 2,990 |  | 1,567 |  |  |  |
Mortgage loans, land |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | 37 |  | 34 |  |  |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 619 |  | 810 |  |  |  |
Allowance for Loan Losses, Total | 656 | 649 | 844 | 744 | 691 | 918 |
Recorded Investment in Loans, Individually Evaluated for Impairment | 422 |  | 243 |  |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 26,231 |  | 25,303 |  |  |  |
Loans receivable | 26,653 |  | 25,546 |  |  |  |
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 | 645 |  | 649 |  |  |  |
Allowance for Loan Losses, Total | 645 | 667 | 649 | 946 | 945 | 983 |
Recorded Investment in Loans, Individually Evaluated for Impairment | 606 |  | 359 |  |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 41,598 |  | 36,982 |  |  |  |
Loans receivable | 42,204 |  | 37,341 |  |  |  |
Consumer loans, other |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | 8 |  | 0 |  |  |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 79 |  | 117 |  |  |  |
Allowance for Loan Losses, Total | 87 | 112 | 117 | 121 | 120 | 121 |
Recorded Investment in Loans, Individually Evaluated for Impairment | 14 |  | 0 |  |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 4,436 |  | 3,515 |  |  |  |
Loans receivable | 4,450 |  | 3,515 |  |  |  |
Commercial business loans |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |
Allowance for Loan Losses, Individually Evaluated for Impairment | 214 |  | 63 |  |  |  |
Allowance for Loan Losses, Collectively Evaluated for Impairment | 621 |  | 494 |  |  |  |
Allowance for Loan Losses, Total | 835 | $ 752 | 557 | $ 558 | $ 563 | $ 515 |
Recorded Investment in Loans, Individually Evaluated for Impairment | 749 |  | 170 |  |  |  |
Recorded Investment in Loans, Collectively Evaluated for Impairment | 64,436 |  | 42,883 |  |  |  |
Loans receivable | $ 65,185 |  | $ 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 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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