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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, 2014
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Income Tax Disclosure [Abstract]                      
Current                 $ 3,996 $ 2,349 $ 1,737
Deferred                 196 451 777
Provision $ 1,563 $ 776 $ 1,128 $ 676 $ 825 $ 685 $ 537 $ 802 $ 4,192 $ 2,800 $ 2,514