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Federal Income Taxes: Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	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 Disclosure [Abstract]
Expected federal income tax provision at statutory rate									$ 5,500	$ 7,435	$ 5,160
Net impact of the Tax Act									548	0	0
BOLI income									(134)	(191)	(189)
Dividends on ESOP									(71)	(102)	(83)
Stock options tax effect									(157)	(188)	0
Other, net									15	122	13
Provision for income taxes	$ 1,370	$ 1,334	$ 1,216	$ 1,781	$ 1,748	$ 2,188	$ 1,568	$ 1,572	$ 5,701	$ 7,076	$ 4,901

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Effective Income Tax Rate Reconciliation, Tax Cuts and Jobs Act of 2017, Amount\

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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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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to deduction for dividend paid to employee stock ownership plan.

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