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Document and Entity Information (USD $)
 3 Months Ended
Dec. 31, 2011
Document and Entity Information  
Entity Registrant Name RIVERVIEW BANCORP INC
Document Type 10-Q
Document Period End Date Dec. 31, 2011
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 $ 53,258,379
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 2012
Document Fiscal Period Focus Q3