Cover - USD ($)	12 Months Ended
	Dec. 31, 2021	Mar. 04, 2022	Jun. 30, 2021
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2021
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	000-33501
Entity Registrant Name	NORTHRIM BANCORP, INC.
Entity Incorporation, State or Country Code	AK
Entity Tax Identification Number	92-0175752
Entity Address, Address Line One	3111 C Street
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
Title of 12(g) Security	Common Stock, $1.00 par value
Security Exchange Name	NASDAQ
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Public Float			$ 258,025,106
Entity Common Stock, Shares Outstanding		5,941,885
Documents Incorporated by Reference	Portions of the registrant's Proxy Statement on Schedule 14A, relating to the registrant’s annual meeting of shareholders to be held on May 26, 2022, are incorporated by reference into Part III of this Form 10-K.
Amendment Flag	false
Entity Central Index Key	0001163370
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	FY
Trading Symbol	NRIM