Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2018	Nov. 06, 2018
Document and Entity Information:
Entity Registrant Name	AMERICAN RIVER BANKSHARES
Document Type	10-Q
Document Period End Date	Sep. 30, 2018
Amendment Flag	false
Entity Central Index Key	0001108236
Current Fiscal Year End Date	--12-31
Entity Common Stock, Shares Outstanding		5,868,637
Entity Filer Category	Accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Current Reporting Status	Yes
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q3