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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, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Income Tax Disclosure [Abstract]                      
Expected federal income tax provision at statutory rate                 $ 6,208 $ 7,230 $ 6,365
BOLI income                 (129) (125) (124)
Dividends on ESOP                 (70) (88) (75)
Stock options tax effect                 (34) (167) (33)
Other, net                 (13) (5) (95)
Provision for income taxes $ 1,785 $ 1,472 $ 1,316 $ 1,389 $ 1,525 $ 1,786 $ 1,651 $ 1,883 $ 5,962 $ 6,845 $ 6,038