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Document and Entity Information (USD $)
 12 Months Ended
Mar. 31, 2013
May 31, 2013
Sep. 30, 2012
Document and Entity Information:      
Entity Registrant Name RIVERVIEW BANCORP INC    
Document Type 10-K    
Document Period End Date Mar. 31, 2013    
Amendment Flag false    
Entity Central Index Key 0001041368    
Current Fiscal Year End Date --03-31    
Entity Common Stock, Shares Outstanding   22,471,890  
Entity Filer Category Smaller Reporting Company    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Well-known Seasoned Issuer No    
Document Fiscal Year Focus 2013    
Document Fiscal Period Focus FY    
Entity Public Float     $ 30,786,489