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Document and Entity Information
 9 Months Ended
Dec. 31, 2014
Feb. 12, 2015
Document and Entity Information:    
Entity Registrant Name RIVERVIEW BANCORP INC  
Document Type 10-Q  
Document Period End Date Dec. 31, 2014  
Amendment Flag false  
Entity Central Index Key 0001041368  
Current Fiscal Year End Date --03-31  
Entity Common Stock, Shares Outstanding   22,471,890dei_EntityCommonStockSharesOutstanding
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 2015  
Document Fiscal Period Focus Q3