Document And Entity Information - shares	3 Months Ended
	Mar. 31, 2020	May 05, 2020
Cover [Abstract]
Entity Interactive Data Current	Yes
Entity Address, Address Line One	3111 C Street
Document Quarterly Report	true
Document Type	10-Q
Entity Incorporation, State or Country Code	AK
Document Period End Date	Mar. 31, 2020
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	2020
Entity Common Stock, Shares Outstanding		6,366,100
Entity Emerging Growth Company	false
Entity Small Business	true
Entity Shell Company	false
Entity Current Reporting Status	Yes
Entity Tax Identification Number	92-0175752
Document Transition Report	false
Entity File Number	000-33501
Entity Address, City or Town	Anchorage
Entity Address, State or Province	AK
Entity Address, Postal Zip Code	99503
City Area Code	907
Local Phone Number	562-0062
Document Fiscal Period Focus	Q1