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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, 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 Disclosure [Abstract]
Expected federal income tax provision at statutory rate									$ 6,365	$ 6,283	$ 5,500
Net impact of the Tax Act									0	0	548
BOLI income									(124)	(345)	(134)
Dividends on ESOP									(75)	(73)	(71)
Stock options tax effect									(33)	(87)	(157)
Other, net									(95)	123	15
Provision for income taxes	$ 1,635	$ 1,463	$ 1,225	$ 1,715	$ 1,639	$ 1,552	$ 1,277	$ 1,433	$ 6,038	$ 5,901	$ 5,701

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Amount of reported income tax expense (benefit) in excess of (less than) expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operations, attributable to Tax Cuts and Jobs Act.

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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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