XML 78 R1.htm IDEA: XBRL DOCUMENT v3.20.1
Document and Entity Information - USD ($)
 12 Months Ended
Mar. 31, 2020
Jun. 17, 2020
Sep. 30, 2019
Document and Entity Information:      
Document Type 10-K    
Document Period End Date Mar. 31, 2020    
Entity Registrant Name RIVERVIEW BANCORP INC    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 167,883,081
Entity Common Stock, Shares Outstanding   22,253,385  
Entity Central Index Key 0001041368    
Current Fiscal Year End Date --03-31    
Document Fiscal Year Focus 2020    
Document Fiscal Period Focus FY    
Amendment Flag false    
Trading Symbol rvsb