Document And Entity Information - shares	3 Months Ended
	Mar. 31, 2016	May. 09, 2016
Document And Entity Information [Abstract]
Document Type	10-Q
Document Period End Date	Mar. 31, 2016
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	2016
Document Fiscal Period Focus	Q1
Entity Common Stock, Shares Outstanding		6,877,140
Trading Symbol	NRIM