Document And Entity Information	6 Months Ended
	Jun. 30, 2013	Aug. 06, 2013
Document and Entity Information [Abstract]
Entity Registrant Name	AMERICAN RIVER BANKSHARES
Entity Central Index Key	0001108236
Trading Symbol	amrb
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		8,833,562
Document Type	10-Q
Document Period End Date	Jun. 30, 2013
Amendment Flag	false
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q2