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Loans Receivable And Allowance For Loan Losses: Schedule of Loans receivable and Loans held for sale (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Sep. 30, 2018
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans receivable | $ 970,073 | $ 820,795 |
Undisbursed portion of construction loans in process | 100,595 | 83,237 |
Deferred loan origination fees, net | 2,875 | 2,637 |
Allowance for loan losses | 9,533 | 9,530 |
Less: Loans in process, Deferred fees and Allowance for loan losses | 113,003 | 95,404 |
Loans receivable, net | $ 857,070 | $ 725,391 | [1]
Ratio of loan category to total loans receivable (percent) | 100.00% | 100.02239% |
Total mortgage loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Mortgage loans | $ 866,960 | $ 736,886 |
Ratio of loan category to total loans receivable (percent) | 89.30% | 89.80% |
Mortgage loans, one-to-four family |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Mortgage loans | $ 130,219 | $ 115,941 |
Ratio of loan category to total loans receivable (percent) | 13.40% | 14.10% |
Mortgage loans excluded | $ 2,988 | $ 1,785 |
Mortgage loans, multi-family |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Mortgage loans | $ 72,076 | $ 61,928 |
Ratio of loan category to total loans receivable (percent) | 7.40% | 7.50% |
Mortgage loans, commercial |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Mortgage loans | $ 426,144 | $ 345,113 |
Ratio of loan category to total loans receivable (percent) | 43.90% | 42.00% |
Mortgage loans, construction - custom and owner/builder |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Mortgage loans | $ 119,214 | $ 119,555 |
Ratio of loan category to total loans receivable (percent) | 12.30% | 14.60% |
Mortgage loans, construction - speculative one-to-four family |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Mortgage loans | $ 17,934 | $ 15,433 |
Ratio of loan category to total loans receivable (percent) | 1.90% | 1.90% |
Mortgage loans, construction – commercial |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Mortgage loans | $ 42,416 | $ 39,590 |
Ratio of loan category to total loans receivable (percent) | 4.40% | 4.80% |
Mortgage loans, construction - Multi-family |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Mortgage loans | $ 25,645 | $ 10,740 |
Ratio of loan category to total loans receivable (percent) | 2.60% | 1.30% |
Mortgage loans, construction - Land development |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Mortgage loans | $ 10,578 | $ 3,040 |
Ratio of loan category to total loans receivable (percent) | 1.10% | 0.40% |
Mortgage loans, land |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Mortgage loans | $ 22,734 | $ 25,546 |
Ratio of loan category to total loans receivable (percent) | 2.30% | 3.10% |
Total consumer loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Consumer loans | $ 44,911 | $ 40,856 |
Ratio of loan category to total loans receivable (percent) | 4.70% | 5.00% |
Consumer loans, home equity and second mortgage |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Consumer loans | $ 40,468 | $ 37,341 |
Ratio of loan category to total loans receivable (percent) | 4.20% | 4.50% |
Consumer loans, other |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Consumer loans | $ 4,443 | $ 3,515 |
Ratio of loan category to total loans receivable (percent) | 0.50% | 0.50% |
Commercial business loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial business loans | $ 58,202 | $ 43,053 |
Ratio of loan category to total loans receivable (percent) | 6.00% | 5.20% |
Consumer loans excluded | $ 0 | $ 0 |
[1] | Derived from audited consolidated financial statements.

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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + 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 Reference 2: 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 6.L.1) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544 + Details
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