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Federal Income Taxes: Narrative (Details) - USD ($)	3 Months Ended								12 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
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	$ 1,370,000	$ 1,334,000	$ 1,216,000	$ 1,781,000	$ 1,748,000	$ 2,188,000	$ 1,568,000	$ 1,572,000	5,701,000	$ 7,076,000	$ 4,901,000
Income taxes receivable	151,000				559,000				151,000	559,000
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

Tax Cuts and Jobs Act of 2017, Change in Tax Rate, Deferred Tax Asset, Income Tax Expense (Benefit)

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Carrying amount as of the balance sheet date of income taxes previously overpaid to tax authorities (such as U.S. Federal, state and local tax authorities) representing refunds of overpayments or recoveries based on agreed-upon resolutions of disputes. Also called income tax refund receivable.

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