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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, 2025	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Income Tax Disclosure [Abstract]
Expected federal income tax provision at statutory rate									$ 7,609	$ 6,385	$ 7,139
BOLI income									(357)	(135)	(148)
Dividends on Employee Stock Ownership Plan ("ESOP") stock									(58)	(58)	(71)
Stock-based compensation tax effect									(95)	(37)	(66)
Other, net									(29)	(32)	22
Provision for income taxes	$ 1,861	$ 1,790	$ 1,705	$ 1,714	$ 1,572	$ 1,535	$ 1,470	$ 1,546	$ 7,070	$ 6,123	$ 6,876

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