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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, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Income Tax Disclosure [Abstract]                      
Expected federal income tax provision at statutory rate                 $ 6,283 $ 5,500 $ 7,435
Net impact of the Tax Act                 0 548 0
BOLI income                 (345) (134) (191)
Dividends on ESOP                 (73) (71) (102)
Stock options tax effect                 (87) (157) (188)
Other, net                 123 15 122
Provision for income taxes $ 1,639 $ 1,552 $ 1,277 $ 1,433 $ 1,370 $ 1,334 $ 1,216 $ 1,781 $ 5,901 $ 5,701 $ 7,076