XML 16 R1.htm IDEA: XBRL DOCUMENT v3.21.2
Document and Entity Information - USD ($)
 12 Months Ended
Mar. 31, 2021
Jun. 18, 2021
Sep. 30, 2020
Document and Entity Information:      
Document Type 10-K    
Document Period End Date Mar. 31, 2021    
Entity Registrant Name RIVERVIEW BANCORP INC    
Title of 12(b) Security Common Stock, Par Value $0.01 per share    
Trading Symbol RVSB    
Security Exchange Name NASDAQ    
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 Common Stock, Shares Outstanding   22,351,235  
Entity Central Index Key 0001041368    
Current Fiscal Year End Date --03-31    
Document Fiscal Year Focus 2021    
Document Fiscal Period Focus FY    
Amendment Flag false    
Entity Public Float     $ 92,695,375