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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, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Income Tax Disclosure [Abstract]
Expected federal income tax provision at statutory rate									$ 6,385	$ 7,139	$ 6,208
BOLI income									(135)	(148)	(129)
Dividends on Employee Stock Ownership Plan ("ESOP") stock									(58)	(71)	(70)
Stock based compensation tax effect									(37)	(66)	(34)
Other, net									(32)	22	(13)
Provision for income taxes	$ 1,572	$ 1,535	$ 1,470	$ 1,546	$ 1,624	$ 1,666	$ 1,705	$ 1,881	$ 6,123	$ 6,876	$ 5,962

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