Document And Entity Information	3 Months Ended
	Mar. 31, 2015	May 08, 2015
Document And Entity Information [Abstract]
Document Type	10-Q
Document Period End Date	Mar. 31, 2015
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	2015
Document Fiscal Period Focus	Q1
Entity Common Stock, Shares Outstanding		6,854,189
Trading Symbol	NRIM