Basis of Presentation and Significant Accounting Policies (Policies)	3 Months Ended
Mar. 31, 2026
Accounting Policies [Abstract]
Consolidation	The Company prepares its consolidated financial statements in conformity with accounting principles generally accepted in the United States of America (“U.S. GAAP”). The accompanying consolidated financial statements have not been audited, and they include the accounts of the Company and its wholly-owned subsidiaries, and the wholly owned subsidiaries of Northrim Bank (the “Bank”). Significant intercompany balances have been eliminated in consolidation. As of December 31, 2024, the Company had one wholly-owned business trust subsidiary, Northrim Statutory Trust 2 (“Trust 2”), that was formed to issue trust preferred securities and related common securities of Trust 2. The Company has not consolidated the accounts of Trust 2 in its consolidated financial statements in accordance with U.S. GAAP. As a result, the junior subordinated debentures issued by the Company to Trust 2 are reflected on the Company’s consolidated balance sheet as junior subordinated debentures. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included. The Company determined that it operates in three primary operating segments: Community Banking, Home Mortgage Lending, and Specialty Finance. The Company has evaluated subsequent events and transactions for potential recognition or disclosure. Operating results for the interim period ended March 31, 2026 are not necessarily indicative of the results anticipated for the year ending December 31, 2026. These consolidated financial statements should be read in conjunction with the Company’s Annual Report on Form 10-K for the year ended December 31, 2025. The Company’s significant accounting policies are discussed in Note 1 to the audited consolidated financial statements included in the Company's Annual Report on Form 10-K for the year ended December 31, 2025. There have been no significant changes in our application of these accounting policies in 2026, except for the addition of the following item.
Basis of Presentation	The Company prepares its consolidated financial statements in conformity with accounting principles generally accepted in the United States of America (“U.S. GAAP”). The accompanying consolidated financial statements have not been audited, and they include the accounts of the Company and its wholly-owned subsidiaries, and the wholly owned subsidiaries of Northrim Bank (the “Bank”). Significant intercompany balances have been eliminated in consolidation. As of December 31, 2024, the Company had one wholly-owned business trust subsidiary, Northrim Statutory Trust 2 (“Trust 2”), that was formed to issue trust preferred securities and related common securities of Trust 2. The Company has not consolidated the accounts of Trust 2 in its consolidated financial statements in accordance with U.S. GAAP. As a result, the junior subordinated debentures issued by the Company to Trust 2 are reflected on the Company’s consolidated balance sheet as junior subordinated debentures. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included. The Company determined that it operates in three primary operating segments: Community Banking, Home Mortgage Lending, and Specialty Finance. The Company has evaluated subsequent events and transactions for potential recognition or disclosure. Operating results for the interim period ended March 31, 2026 are not necessarily indicative of the results anticipated for the year ending December 31, 2026. These consolidated financial statements should be read in conjunction with the Company’s Annual Report on Form 10-K for the year ended December 31, 2025. The Company’s significant accounting policies are discussed in Note 1 to the audited consolidated financial statements included in the Company's Annual Report on Form 10-K for the year ended December 31, 2025. There have been no significant changes in our application of these accounting policies in 2026, except for the addition of the following item.
Subordinated Debt	Subordinated Debt: The Company’s subordinated debt is recorded at its contractual principal amount net of unamortized debt issuance costs and original issue discounts or premiums, if any. The debt is subordinate in right of payment to all existing and future senior indebtedness of the Company, as defined in the related indenture or credit agreement. Debt issuance costs incurred in connection with subordinated debt are deferred and presented as a direct deduction from the carrying amount of the related debt and are amortized over the term of the debt using the effective interest method. Interest expense related to subordinated debt includes cash interest and the amortization of debt issuance costs and is recognized in interest expense in the consolidated statements of income.
Reclassification of Prior Period Presentation	Reclassification of Prior Period Presentation Certain prior year amounts have been reclassified for consistency with the current period presentation. These reclassifications had no effect on the reported results of operations or total shareholders' equity.
Recent Accounting Pronouncements	Recent Accounting Pronouncements Accounting pronouncements to be implemented in future periods In November 2024, the FASB issued ASU 2024-03, Disaggregation of Income Statement Expenses (“ASU 2024-03”). This updated mandates that public business entities provide detailed disclosures in the notes to the financial statements, breaking down specific expense categories such as purchases of inventory, employee compensation, depreciation, intangible asset amortization, and depreciation, depletion, and amortization recognized as part of oil- and gas-producing activities included in each relevant expense cation. The objective is to enhance transparency, enabling investors to gain a clearer understanding of the nature and impact of these expenses on the Company's financial performance. ASU 2024-03 is effective for annual reporting periods beginning after December 15, 2026 and may be applied on a prospective or retrospective basis. The Company intends to adopt ASU 2024-03 prospectively and does not believe that the adoption will have a material impact on the Company's consolidated financial statements. In November 2025, the FASB issued ASU 2025‑08, Financial Instruments—Credit Losses (Topic 326): Purchased Loans (“ASU 2025-08”). The amendments in ASU 2025‑08 are intended to simplify and improve the accounting for acquired loans under the Current Expected Credit Losses (“CECL”) model by expanding the use of the “gross‑up” approach currently applied only to purchased credit deteriorated (“PCD”) assets. Under prior generally accepted accounting principles, entities were required to distinguish between PCD and non‑PCD acquired loans, resulting in differing Day 1 accounting and concerns about complexity, comparability, and perceived double‑counting of credit losses for non‑PCD loans. ASU 2025‑08 creates a new category of “purchased seasoned loans,” defined as acquired loans—in a business combination or acquired more than 90 days after origination—other than credit cards, that meet certain criteria. These loans must now be accounted for using the gross‑up approach. This method requires an entity to recognize an allowance for expected credit losses at the acquisition date with a corresponding increase to the loan’s amortized cost basis, eliminating Day 1 credit loss expense while reducing subsequent interest income. Existing guidance for PCD assets remains unchanged. ASU 2025‑08 is effective for the Company for interim and annual reporting periods beginning after December 15, 2026 and must be applied prospectively to loans acquired after the adoption date. Early adoption is permitted. The Company is currently evaluating the impact of ASU 2025‑08 but does not expect the adoption to have a material effect on its consolidated financial statements. In November 2025, FASB issued ASU 2025‑09, Derivatives and Hedging (Topic 815): Hedge Accounting Improvements (“ASU 2025‑09”). The amendments in ASU 2025‑09 clarify and expand certain aspects of hedge accounting to better align financial reporting with the economics of an entity’s risk‑management activities. The ASU addresses stakeholder feedback following the implementation of prior hedge accounting guidance and issues arising from the global transition away from LIBOR. The amendments include targeted improvements across several areas of hedge accounting. Among the key changes, ASU 2025‑09 (i) expands the ability to aggregate forecasted transactions with similar risk exposures in cash flow hedges, (ii) introduces a model that facilitates hedge accounting for forecasted interest payments on “choose‑your‑rate” debt instruments, (iii) broadens hedge accounting for forecasted purchases and sales of nonfinancial assets, and (iv) updates guidance related to net written options used as hedging instruments. These improvements are intended to reduce complexity, increase consistency, and enhance the decision‑usefulness of hedge accounting outcomes. ASU 2025‑09 is effective for the Company for fiscal years beginning after December 15, 2026, including interim periods within those fiscal years. Early adoption is permitted. The Company is currently evaluating the impact of ASU 2025‑09 and does not expect the adoption to have a material effect on its consolidated financial statements. In December 2025, the FASB issued ASU 2025‑11, Interim Reporting (Topic 270): Narrow‑Scope Improvements (“ASU 2025‑11”). The amendments are intended to improve the clarity and navigability of interim reporting requirements within Topic 270 by clarifying when interim reporting guidance applies, enhancing the organization of required interim disclosures, and specifying the form and content of interim financial statements. The guidance responds to stakeholder feedback that existing interim reporting requirements were difficult to navigate because of the historical origins and accumulated amendments within Topic 270. ASU 2025‑11 adds a disclosure principle requiring entities to disclose events that occur after the end of the most recent annual reporting period that have a material impact on the entity. The amendments also introduce a comprehensive list of required interim disclosures drawn from various Codification topics and clarify the presentation requirements for interim financial statements, including condensed financial statements and accompanying footnotes. Importantly, the ASU does not change the fundamental nature of interim reporting nor expand or reduce existing disclosure requirements; rather, it improves clarity and consistency across entities that issue interim financial statements in accordance with generally accepted accounting principles. ASU 2025‑11 is effective for the Company for interim reporting periods within annual reporting periods beginning after December 15, 2027. Early adoption is permitted, and the amendments may be applied either prospectively or retrospectively. The Company is currently evaluating the impact of ASU 2025‑11 and does not expect the adoption to have a material effect on its consolidated financial statements. In December 2025, the FASB issued ASU 2025‑12, Codification Improvements (“ASU 2025‑12”). This Update is part of the FASB’s ongoing project to address stakeholder‑identified issues in the Accounting Standards Codification. The amendments consist of technical corrections, clarifications, and other incremental improvements intended to enhance the clarity, consistency, and usability of U.S. GAAP. These Codification improvements are not expected to significantly affect current accounting practices or impose substantial costs on most entities. The amendments span a wide range of Topics and include clarifications to diluted earnings‑per‑share calculations, updates to disclosure requirements for certain lease receivables, refinements to the calculation of reference amounts for beneficial interests, clarification of permissible methods for treasury stock retirements, and guidance regarding the transfer and measurement of receivables arising from contracts with customers. Although the updates are largely non‑substantive, certain clarifications may affect how entities apply existing guidance where the prior Codification language was ambiguous or inconsistent. ASU 2025‑12 is effective for the Company for annual reporting periods beginning after December 15, 2026, including interim periods within those annual periods. Early adoption is permitted. The Company is currently evaluating the impact of ASU 2025‑12 and does not expect the adoption to have a material effect on its consolidated financial statements.

Basis of Presentation and Significant Accounting Policies (Policies)

3 Months Ended

Mar. 31, 2026

The Company prepares its consolidated financial statements in conformity with accounting principles generally accepted in the United States of America (“U.S. GAAP”). The accompanying consolidated financial statements have not been audited, and they include the accounts of the Company and its wholly-owned subsidiaries, and the wholly owned subsidiaries of Northrim Bank (the “Bank”). Significant intercompany balances have been eliminated in consolidation. As of December 31, 2024, the Company had one wholly-owned business trust subsidiary, Northrim Statutory Trust 2 (“Trust 2”), that was formed to issue trust preferred securities and related common securities of Trust 2. The Company has not consolidated the accounts of Trust 2 in its consolidated financial statements in accordance with U.S. GAAP. As a result, the junior subordinated debentures issued by the Company to Trust 2 are reflected on the Company’s consolidated balance sheet as junior subordinated debentures.

In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included. The Company determined that it operates in three primary operating segments: Community Banking, Home Mortgage Lending, and Specialty Finance. The Company has evaluated subsequent events and transactions for potential recognition or disclosure. Operating results for the interim period ended March 31, 2026 are not necessarily indicative of the results anticipated for the year ending December 31, 2026. These consolidated financial statements should be read in conjunction with the Company’s Annual Report on Form 10-K for the year ended December 31, 2025.

The Company’s significant accounting policies are discussed in Note 1 to the audited consolidated financial statements included in the Company's Annual Report on Form 10-K for the year ended December 31, 2025. There have been no significant changes in our application of these accounting policies in 2026, except for the addition of the following item.

Basis of Presentation

Subordinated Debt

Subordinated Debt: The Company’s subordinated debt is recorded at its contractual principal amount net of unamortized debt issuance costs and original issue discounts or premiums, if any. The debt is subordinate in right of payment to all existing and future senior indebtedness of the Company, as defined in the related indenture or credit agreement. Debt issuance costs incurred in connection with subordinated debt are deferred and presented as a direct deduction from the carrying amount of the related debt and are amortized over the term of the debt using the effective interest method. Interest expense related to subordinated debt includes cash interest and the amortization of debt issuance costs and is recognized in interest expense in the consolidated statements of income.

Reclassification of Prior Period Presentation

Certain prior year amounts have been reclassified for consistency with the current period presentation. These reclassifications had no effect on the reported results of operations or total shareholders' equity.

Recent Accounting Pronouncements

Accounting pronouncements to be implemented in future periods

In November 2024, the FASB issued ASU 2024-03, Disaggregation of Income Statement Expenses (“ASU 2024-03”). This updated mandates that public business entities provide detailed disclosures in the notes to the financial statements, breaking down specific expense categories such as purchases of inventory, employee compensation, depreciation, intangible asset amortization, and depreciation, depletion, and amortization recognized as part of oil- and gas-producing activities included in each relevant expense cation. The objective is to enhance transparency, enabling investors to gain a clearer understanding of the nature and impact of these expenses on the Company's financial performance. ASU 2024-03 is effective for annual reporting periods beginning after December 15, 2026 and may be applied on a prospective or retrospective basis. The Company intends to adopt ASU 2024-03 prospectively and does not believe that the adoption will have a material impact on the Company's consolidated financial statements.

In November 2025, the FASB issued ASU 2025‑08, Financial Instruments—Credit Losses (Topic 326): Purchased Loans (“ASU 2025-08”). The amendments in ASU 2025‑08 are intended to simplify and improve the accounting for acquired loans under the Current Expected Credit Losses (“CECL”) model by expanding the use of the “gross‑up” approach currently applied only to purchased credit deteriorated (“PCD”) assets. Under prior generally accepted accounting principles, entities were required to distinguish between PCD and non‑PCD acquired loans, resulting in differing Day 1 accounting and concerns about complexity, comparability, and perceived double‑counting of credit losses for non‑PCD loans. ASU 2025‑08 creates a new category of “purchased seasoned loans,” defined as acquired loans—in a business combination or acquired more than 90 days after origination—other than credit cards, that meet certain criteria. These loans must now be accounted for using the gross‑up approach. This method requires an entity to recognize an allowance for expected credit losses at the acquisition date with a corresponding increase to the loan’s amortized cost basis, eliminating Day 1 credit loss expense while reducing subsequent interest income. Existing guidance for PCD assets remains unchanged. ASU 2025‑08 is effective for the Company for interim and annual reporting periods beginning after December 15, 2026 and must be applied prospectively to loans acquired after the adoption date. Early adoption is permitted. The Company is currently evaluating the impact of ASU 2025‑08 but does not expect the adoption to have a material effect on its consolidated financial statements.

In November 2025, FASB issued ASU 2025‑09, Derivatives and Hedging (Topic 815): Hedge Accounting Improvements (“ASU 2025‑09”). The amendments in ASU 2025‑09 clarify and expand certain aspects of hedge accounting to better align financial reporting with the economics of an entity’s risk‑management activities. The ASU addresses stakeholder feedback following the implementation of prior hedge accounting guidance and issues arising from the global transition away from LIBOR. The amendments include targeted improvements across several areas of hedge accounting. Among the key changes, ASU 2025‑09 (i) expands the ability to aggregate forecasted transactions with similar risk exposures in cash flow hedges, (ii) introduces a model that facilitates hedge accounting for forecasted interest payments on “choose‑your‑rate” debt instruments, (iii) broadens hedge accounting for forecasted purchases and sales of nonfinancial assets, and (iv) updates guidance related to net written options used as hedging instruments. These improvements are intended to reduce complexity, increase consistency, and enhance the decision‑usefulness of hedge accounting outcomes. ASU 2025‑09 is effective for the Company for fiscal years beginning after December 15, 2026, including interim periods within those fiscal years. Early adoption is permitted. The Company is currently evaluating the impact of ASU 2025‑09 and does not expect the adoption to have a material effect on its consolidated financial statements.

In December 2025, the FASB issued ASU 2025‑11, Interim Reporting (Topic 270): Narrow‑Scope Improvements (“ASU 2025‑11”). The amendments are intended to improve the clarity and navigability of interim reporting requirements within Topic 270 by clarifying when interim reporting guidance applies, enhancing the organization of required interim disclosures, and specifying the form and content of interim financial statements. The guidance responds to stakeholder feedback that existing interim reporting requirements were difficult to navigate because of the historical origins and accumulated amendments within Topic 270. ASU 2025‑11 adds a disclosure principle requiring entities to disclose events that occur after the end of the most recent annual reporting period that have a material impact on the entity. The amendments also introduce a comprehensive list of required interim disclosures drawn from various Codification topics and clarify the presentation requirements for interim financial statements, including condensed financial statements and accompanying footnotes. Importantly, the ASU does not change the fundamental nature of interim reporting nor expand or reduce existing disclosure requirements; rather, it improves clarity and consistency across entities that issue interim financial statements in accordance with generally accepted accounting principles. ASU 2025‑11 is effective for the Company for interim reporting periods within annual reporting periods beginning after December 15, 2027. Early adoption is permitted, and the amendments may be applied either prospectively or retrospectively. The Company is currently evaluating the impact of ASU 2025‑11 and does not expect the adoption to have a material effect on its consolidated financial statements.

In December 2025, the FASB issued ASU 2025‑12, Codification Improvements (“ASU 2025‑12”). This Update is part of the FASB’s ongoing project to address stakeholder‑identified issues in the Accounting Standards Codification. The amendments consist of technical corrections, clarifications, and other incremental improvements intended to enhance the clarity, consistency, and usability of U.S. GAAP. These Codification improvements are not expected to significantly affect current accounting practices or impose substantial costs on most entities. The amendments span a wide range of Topics and include clarifications to diluted earnings‑per‑share calculations, updates to disclosure requirements for certain lease receivables, refinements to the calculation of reference amounts for beneficial interests, clarification of permissible methods for treasury stock retirements, and guidance regarding the transfer and measurement of receivables arising from contracts with customers. Although the updates are largely non‑substantive, certain clarifications may affect how entities apply existing guidance where the prior Codification language was ambiguous or inconsistent. ASU 2025‑12 is effective for the Company for annual reporting periods beginning after December 15, 2026, including interim periods within those annual periods. Early adoption is permitted. The Company is currently evaluating the impact of ASU 2025‑12 and does not expect the adoption to have a material effect on its consolidated financial statements.