Document and Entity Information - shares	3 Months Ended
	Jun. 30, 2022	Aug. 12, 2022
Document and Entity Information:
Document Type	10-Q
Document Period End Date	Jun. 30, 2022
Document Quarterly Report	true
Document Transition Report	false
Entity 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		22,943,160
Entity Central Index Key	0001041368
Current Fiscal Year End Date	--03-31
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q1
Amendment Flag	false