Document And Entity Information	9 Months Ended
	Sep. 30, 2012	Nov. 08, 2012
Document And Entity Information [Abstract]
Document Type	10-Q
Document Period End Date	Sep. 30, 2012
Amendment Flag	false
Entity Registrant Name	NORTHRIM BANCORP INC
Entity Central Index Key	0001163370
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	Q3
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Common Stock, Shares Outstanding		6,476,834
Trading Symbol	NRIM