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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, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Earnings Per Share, Basic [Abstract]                      
Net income to common shareholders                 $ 23,600 $ 27,583 $ 24,269
Denominator – weighted average common shares outstanding (shares)                 8,304,002 8,340,983 8,326,600
Basic net income per common share (in dollars per share) $ 0.86 $ 0.69 $ 0.64 $ 0.66 $ 0.72 $ 0.84 $ 0.87 $ 0.88 $ 2.84 $ 3.31 $ 2.91
Diluted net income per common share computation                      
Effect of dilutive stock options (shares)                 79,333 103,350 95,886
Weighted average common shares outstanding-assuming dilution (shares)                 8,383,335 8,444,333 8,422,486
Diluted net income per common share (in dollars per share) $ 0.85 $ 0.69 $ 0.63 $ 0.65 $ 0.71 $ 0.83 $ 0.86 $ 0.87 $ 2.82 $ 3.27 $ 2.88