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Net Income Per Common Share: Schedule of Earnings per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Earnings Per Share, Basic [Abstract]                      
Net income to common shareholders                 $ 29,161 $ 24,283 $ 27,118
Denominator – weighted average common shares outstanding (shares)                 7,917,193 8,038,674 8,175,898
Basic net income per common share (in dollars per share) $ 1.07 $ 0.90 $ 0.85 $ 0.86 $ 0.80 $ 0.74 $ 0.71 $ 0.78 $ 3.68 $ 3.02 $ 3.32
Diluted net income per common share computation                      
Effect of dilutive stock options (shares)                 35,433 41,708 72,283
Weighted average common shares outstanding-assuming dilution (shares)                 7,952,626 8,080,382 8,248,181
Diluted net income per common share (in dollars per share) $ 1.07 $ 0.90 $ 0.85 $ 0.86 $ 0.79 $ 0.74 $ 0.70 $ 0.77 $ 3.67 $ 3.01 $ 3.29