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Federal Income Taxes: Narrative (Details) - USD ($) | 3 Months Ended | 12 Months Ended
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Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |
Effective tax rate |  |  |  |  |  |  |  |  | 24.50% |  |
Change in tax rate, income tax expense (benefit) |  |  |  |  |  |  |  |  | $ 2,210,000 |  |
Provision for income taxes | $ 1,639,000 | $ 1,552,000 | $ 1,277,000 | $ 1,433,000 | $ 1,370,000 | $ 1,334,000 | $ 1,216,000 | $ 1,781,000 | 5,901,000 | $ 5,701,000 | $ 7,076,000
Income taxes receivable | 1,210,000 |  |  |  | 151,000 |  |  |  | 1,210,000 | 151,000 |
Deferred tax assets, valuation allowance | $ 0 |  |  |  | $ 0 |  |  |  | $ 0 | $ 0 |
Deferred Tax Asset |  |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |
Provision for income taxes |  |  |  | $ 548,000 |  |  |  |  |  |  |

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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109238882&loc=d3e38679-109324 + Details
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