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Net Income Per Common Share: Schedule of Earnings per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Earnings Per Share, Basic [Abstract]        
Numerator – net income $ 5,049 $ 6,114 $ 11,701 $ 11,729
Denominator – weighted average common shares outstanding (in shares) 8,344,201 8,310,074 8,342,828 8,301,550
Basic net income per common share (in dollars per share) $ 0.61 $ 0.74 $ 1.40 $ 1.41
Earnings Per Share, Diluted [Abstract]        
Effect of dilutive stock options (in shares) [1] 112,458 154,576 123,066 159,588
Weighted average common shares and common stock equivalents (in shares) 8,456,659 8,464,650 8,465,894 8,461,138
Diluted net income per common share (in dollars per share) $ 0.60 $ 0.72 $ 1.38 $ 1.39
Stock Options        
Earnings Per Share, Diluted [Abstract]        
Antidilutive securities excluded from computation of earnings per share (in shares) 138,362 102,150 121,497 102,504
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