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Federal Income Taxes: Schedule of Components of Income Tax Expense (Benefit) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Income Tax Disclosure [Abstract]                      
Federal                 $ 4,900 $ 6,656 $ 4,618
State                 4 35 0
Deferred                 797 385 283
Provision for income taxes $ 1,370 $ 1,334 $ 1,216 $ 1,781 $ 1,748 $ 2,188 $ 1,568 $ 1,572 $ 5,701 $ 7,076 $ 4,901