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Document and Entity Information (USD $)
 9 Months Ended
Dec. 31, 2012
Document and Entity Information:  
Entity Registrant Name RIVERVIEW BANCORP INC
Document Type 10-Q
Document Period End Date Dec. 31, 2012
Amendment Flag false
Entity Central Index Key 0001041368
Current Fiscal Year End Date --03-31
Entity Common Stock, Shares Outstanding 22,471,890
Entity Public Float $ 37,977,494
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 Q3