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Stock Compensation Plans: Stock Option Activity (Details) - $ / shares
 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Number of Shares      
Options outstanding, beginning of period (in shares) 378,304 380,820 380,120
Options granted (in shares) 69,150 46,840 45,950
Options exercised (in shares) (37,975) (43,856) (40,100)
Options forfeited (in shares) (14,130) (5,500) (5,150)
Options outstanding, end of period (in shares) 395,349 378,304 380,820
Weighted Average Exercise Price      
Options outstanding, beginning of period (in dollars per share) $ 18.15 $ 16.03 $ 13.23
Options granted (in dollars per share) 17.01 27.14 31.80
Options exercised (in dollars per share) 10.31 9.14 7.92
Options forfeited (in dollars per share) 25.36 19.89 13.39
Options outstanding, end of period (in dollars per share) $ 18.45 $ 18.15 $ 16.03