XML 11 R1.htm IDEA: XBRL DOCUMENT v3.20.4
Document and Entity Information - shares
 9 Months Ended
Dec. 31, 2020
Feb. 11, 2021
Document and Entity Information:    
Document Type 10-Q  
Document Period End Date Dec. 31, 2020  
Entity Registrant Name RIVERVIEW BANCORP INC  
Title of 12(b) Security Common Stock  
Security Exchange Name NASDAQ  
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   22,345,235
Entity Central Index Key 0001041368  
Current Fiscal Year End Date --03-31  
Document Fiscal Year Focus 2021  
Document Fiscal Period Focus Q3  
Amendment Flag false  
Trading Symbol RVSB