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Stock Compensation Plans: Stock Option Activity (Details) - $ / shares
 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Number of Shares      
Options outstanding, beginning of period (in shares) 380,820 380,120 373,130
Options granted (in shares) 46,840 45,950 58,250
Options exercised (in shares) (43,856) (40,100) (46,310)
Options forfeited (in shares) (5,500) (5,150) (4,950)
Options outstanding, end of period (in shares) 378,304 380,820 380,120
Weighted Average Exercise Price      
Options outstanding, beginning of period (in dollars per share) $ 16.03 $ 13.23 $ 9.82
Options granted (in dollars per share) 27.14 31.80 29.69
Options exercised (in dollars per share) 9.14 7.92 7.17
Options forfeited (in dollars per share) 19.89 13.39 6.28
Options outstanding, end of period (in dollars per share) $ 18.15 $ 16.03 $ 13.23