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Net Income Per Common Share: Schedule of Earnings per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Earnings Per Share, Basic [Abstract]        
Numerator – net income $ 5,924 $ 6,306 $ 17,928 $ 20,476
Denominator – weighted average common shares outstanding (in shares) 8,004,552 8,156,831 8,067,068 8,203,255
Basic net income per common share (in dollars per share) $ 0.74 $ 0.77 $ 2.22 $ 2.50
Earnings Per Share, Diluted [Abstract]        
Effect of dilutive stock options (in shares) 34,793 57,144 41,975 75,824
Weighted average common shares and common stock equivalents (in shares) 8,039,345 8,213,975 8,109,043 8,279,079
Diluted net income per common share (in dollars per share) $ 0.74 $ 0.77 $ 2.21 $ 2.47
Stock Options        
Earnings Per Share, Diluted [Abstract]        
Antidilutive securities excluded from computation of earnings per share (in shares) 240,820 256,503 233,081 203,823