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Federal Income Taxes: Narrative (Details) - USD ($) | 3 Months Ended | 12 Months Ended
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Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
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 | $ 1,635,000 | $ 1,463,000 | $ 1,225,000 | $ 1,715,000 | $ 1,639,000 | $ 1,552,000 | $ 1,277,000 | $ 1,433,000 | $ 6,038,000 | $ 5,901,000 | 5,701,000
Income taxes receivable | 781,000 |  |  |  | 1,210,000 |  |  |  | 781,000 | 1,210,000 |
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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