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Stock Compensation Plans: Stock Option Activity (Details) - $ / shares
 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Number of Shares      
Options outstanding, beginning of period (in shares) 380,120 373,130 341,300
Options granted (in shares) 45,950 58,250 55,750
Options exercised (in shares) (40,100) (46,310) (21,020)
Options forfeited (in shares) (5,150) (4,950) (2,900)
Options outstanding, end of period (in shares) 380,820 380,120 373,130
Weighted Average Exercise Price      
Options outstanding, beginning of period (in dollars per share) $ 13.23 $ 9.82 $ 8.73
Options granted (in dollars per share) 31.80 29.69 15.67
Options exercised (in dollars per share) 7.92 7.17 7.56
Options forfeited (in dollars per share) 13.39 6.28 9.96
Options outstanding, end of period (in dollars per share) $ 16.03 $ 13.23 $ 9.82