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EARNINGS PER COMMON SHARE (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2022
Mar. 31, 2021
EARNINGS PER COMMON SHARE        
Antidilutive stock options (in shares) 0 0 0 0
Earnings Per Share, Basic [Abstract]        
Net income $ 5,860 $ 2,055 $ 12,397 $ 3,574
Weighted average common shares outstanding (in shares) 5,753,513 4,193,682 5,657,179 4,187,239
Basic earnings per common share (in dollars per share) $ 1.02 $ 0.49 $ 2.19 $ 0.85
Earnings Per Share, Diluted [Abstract]        
Net income $ 5,860 $ 2,055 $ 12,397 $ 3,574
Weighted average common shares outstanding for basic earnings per common share (in shares) 5,753,513 4,193,682 5,657,179 4,187,239
Add: dilutive effects of assumed exercises of stock options (in shares) 96,329 65,339 96,108 65,039
Average shares and dilutive potential common shares (in shares) 5,849,842 4,259,021 5,753,287 4,252,278
Diluted earnings per common share (in dollars per share) $ 1.00 $ 0.48 $ 2.15 $ 0.84