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Stock Compensation Plans: Disclosure of Share-based Compensation Arrangements by Share-based Payment Award (Details) - $ / shares
3 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Shares:    
Options outstanding, beginning of period (shares) 380,120 373,130
Exercised (shares) (6,250) (12,700)
Forfeited (shares) (4,300) 0
Options outstanding, end of period (shares) 369,570 360,430
Weighted Average Exercise Price (in dollars per share):    
Options outstanding, beginning of period (dollars per share) $ 13.23 $ 9.82
Exercised (dollars per share) 9.65 6.31
Forfeited (dollars per share) 11.66 0.00
Options outstanding, end of period (dollars per share) $ 13.31 $ 9.94