Subsequent Events	6 Months Ended
Jun. 30, 2026
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On July 22, 2026, the Company announced that it entered into an Agreement and Plan of Merger (the “Merger Agreement”) by and among Northrim, Whitewater Sub, Inc., a wholly owned subsidiary of the Company (“Merger Sub”), and PBCO Financial Corporation (“PBCO”), pursuant to which the Company will acquire PBCO in an all-stock transaction. Upon the terms and subject to the conditions set forth in the Merger Agreement, (i) PBCO will merge with and into Merger Sub, with Merger Sub surviving the merger, (ii) immediately following the merger of PBCO and Merger Sub, and as a part of a single integrated transaction, Merger Sub will merge with and into the Company, with the Company continuing as the surviving entity, and (iii) promptly following such merger, Northrim Bank (the “Bank”) and People’s Bank of Commerce, a wholly owned subsidiary of PBCO, will merge (the “Bank Merger”), with the Bank continuing as the surviving bank. Pursuant to the terms of the Merger Agreement, PBCO shareholders will receive 1.160 shares of the Company’s common stock for each PBCO share they own. Following closing, PBCO shareholders will own approximately 21% of the outstanding common stock of the Company. The combined company will have approximately $4.2 billion in assets and will expand the Company’s banking footprint into Oregon. The closing of the merger is subject to approvals from the Federal Reserve, the FDIC, the Oregon Department of Consumer and Business Services, Division of Financial Regulation, the Alaska Department of Commerce, Community, and Economic Development, Division of Banking and Securities, the shareholders of the Company, and the shareholders of PBCO.

On July 22, 2026, the Company announced that it entered into an Agreement and Plan of Merger (the “Merger Agreement”) by and among Northrim, Whitewater Sub, Inc., a wholly owned subsidiary of the Company (“Merger Sub”), and PBCO Financial Corporation (“PBCO”), pursuant to which the Company will acquire PBCO in an all-stock transaction. Upon the terms and subject to the conditions set forth in the Merger Agreement, (i) PBCO will merge with and into Merger Sub, with Merger Sub surviving the merger, (ii) immediately following the merger of PBCO and Merger Sub, and as a part of a single integrated transaction, Merger Sub will merge with and into the Company, with the Company continuing as the surviving entity, and (iii) promptly following such merger, Northrim Bank (the “Bank”) and People’s Bank of Commerce, a wholly owned subsidiary of PBCO, will merge (the “Bank Merger”), with the Bank continuing as the surviving bank. Pursuant to the terms of the Merger Agreement, PBCO shareholders will receive 1.160 shares of the Company’s common stock for each PBCO share they own. Following closing, PBCO shareholders will own approximately 21% of the outstanding common stock of the Company. The combined company will have approximately $4.2 billion in assets and will expand the Company’s banking footprint into Oregon. The closing of the merger is subject to approvals from the Federal Reserve, the FDIC, the Oregon Department of Consumer and Business Services, Division of Financial Regulation, the Alaska Department of Commerce, Community, and Economic Development, Division of Banking and Securities, the shareholders of the Company, and the shareholders of PBCO.