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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, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Earnings Per Share, Basic [Abstract]        
Numerator – net income $ 7,100 $ 5,924 $ 20,715 $ 17,928
Denominator – weighted average common shares outstanding (in shares) 7,893,308 8,004,552 7,929,626 8,067,068
Basic net income per common share (in dollars per share) $ 0.90 $ 0.74 $ 2.61 $ 2.22
Earnings Per Share, Diluted [Abstract]        
Effect of dilutive stock options (in shares) 28,454 34,793 33,786 41,975
Weighted average common shares and common stock equivalents (in shares) 7,921,762 8,039,345 7,963,412 8,109,043
Diluted net income per common share (in dollars per share) $ 0.90 $ 0.74 $ 2.60 $ 2.21
Stock Options        
Earnings Per Share, Diluted [Abstract]        
Antidilutive securities excluded from computation of earnings per share (in shares) 137,720 240,820 120,049 233,081