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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, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Income Tax Disclosure [Abstract]                      
Expected federal income tax provision at statutory rate                 $ 7,435 $ 5,160 $ 4,268
BOLI income                 (191) (189) (184)
Dividends on ESOP                 (102) (83) (58)
Other - net                 (66) 13 166
Provision for income taxes $ 1,748 $ 2,188 $ 1,568 $ 1,572 $ 1,255 $ 1,250 $ 1,175 $ 1,221 $ 7,076 $ 4,901 $ 4,192