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Document and Entity Information - shares
 6 Months Ended
Sep. 30, 2025
Nov. 07, 2025
Document and Entity Information:    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Sep. 30, 2025  
Document Transition Report false  
Securities Act File Number 000-22957  
Entity Registrant Name RIVERVIEW BANCORP INC  
Entity Incorporation, State or Country Code WA  
Entity Tax Identification Number 91-1838969  
Entity Address, Address Line One 900 Washington St.  
Entity Address, Address Line Two Ste. 900  
Entity Address, City or Town Vancouver  
Entity Address, State or Province WA  
Entity Address, Postal Zip Code 98660  
City Area Code 360  
Local Phone Number 693-6650  
Title of 12(b) Security Common Stock  
Trading Symbol RVSB  
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   20,750,376
Entity Central Index Key 0001041368  
Current Fiscal Year End Date --03-31  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q2  
Amendment Flag false