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Stock Compensation Plans: Disclosure of Share-based Compensation Arrangements by Share-based Payment Award (Details) - $ / shares
9 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Shares:    
Options outstanding, beginning of period (shares) 373,130 341,300
Exercised (shares) (39,810) (16,220)
Forfeited (shares) (4,950) (2,900)
Options outstanding, end of period (shares) 328,370 322,180
Weighted Average Exercise Price (in dollars per share):    
Options outstanding, beginning of period (dollars per share) $ 9.82 $ 8.73
Exercised (dollars per share) 6.65 7.88
Forfeited (dollars per share) 6.28 9.96
Options outstanding, end of period (dollars per share) $ 10.26 $ 8.76