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Nature of Operations and Summary of Significant Accounting Policies - Basic and Diluted EPS (Detail) - USD ($)
12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Earnings Per Share [Abstract]    
Net Income $ 14,558,000 $ 14,666,000
Basic earnings per common share:    
Basic earnings per share $ 0.99 $ 1
Diluted earnings per common share:    
Diluted earnings per share $ 0.99 $ 1
Common Stock [Member]    
Earnings Per Share [Abstract]    
Net Income $ 14,558,000 $ 14,666,000
Weighted average common shares outstanding - Basic 14,658,000 14,658,000
Weighted average common shares outstanding - Diluted 14,658,000 14,658,000
Basic earnings per common share:    
Basic earnings per share $ 0.99 $ 1
Diluted earnings per common share:    
Diluted earnings per share $ 0.99 $ 1