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Cover - USD ($)
 12 Months Ended
Dec. 31, 2023
Mar. 08, 2024
Jun. 30, 2023
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2023    
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 false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 212,552,889
Entity Common Stock, Shares Outstanding   5,499,578  
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 23, 2024, are incorporated by reference into Part III of this Form 10-K.
    
Amendment Flag false    
Entity Central Index Key 0001163370    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY    
Trading Symbol NRIM