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Principles of Consolidation (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
May 31, 2021
Oct. 31, 2020
Dec. 31, 2019
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Jun. 30, 2022
Mar. 31, 2022
Nov. 30, 2019
PRINCIPLES OF CONSOLIDATION                    
Number of shares additional issued 500 500                
Additional Shares exercised 500 500                
Trust Company                    
PRINCIPLES OF CONSOLIDATION                    
Number of shares issued     1,500              
Number of stock options exercised     1,500              
Non controlling Interest                 $ 234,000  
Net income attributable to the noncontrolling interest       $ 2,000 $ 5,000 $ 4,000 $ 7,000      
Trust Company | Riverview Bank                    
PRINCIPLES OF CONSOLIDATION                    
Ownership percentage       100.00%   100.00%   97.30%   100.00%
Trust Company | Riverview Trust Company's President And Chief Executive Officer                    
PRINCIPLES OF CONSOLIDATION                    
Noncontrolling interest percentage       2.70%   2.70%