Organization and Summary of Significant Accounting Policies	6 Months Ended
	Jun. 30, 2025
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Summary of Significant Accounting Policies	Organization and Summary of Significant Accounting Policies Organization and Nature of Operations Chain Bridge Bancorp, Inc. (the “Company”) is a Delaware corporation and a publicly traded bank holding company whose Class A common stock is listed on the New York Stock Exchange under the symbol “CBNA.” The Company serves as the registered bank holding company for Chain Bridge Bank, National Association (the “Bank”), its wholly-owned subsidiary. The Company does not own or control any other subsidiaries and conducts substantially all of its business through the Bank. Both the Company and Bank have their headquarters and sole executive office in McLean, Virginia. The Bank is a national banking association chartered by the OCC under the National Bank Act. The Bank commenced operations on August 6, 2007, following receipt of its Charter No. 24755 from the OCC. The Bank is a member of the FDIC under Certificate No. 58595 and is also a Federal Reserve member bank, as required of national banks. In 2020, the Bank opened its Trust & Wealth department following authorization from the OCC to exercise full fiduciary powers in accordance with 12 U.S.C. § 92a. The Bank uses a branchless operating model that integrates digital banking channels with in-person services at its headquarters in McLean, Virginia. It offers a broad range of commercial and personal banking services, including deposit accounts, multiple types of loan products, trust administration, wealth management, and asset custody. The Bank’s core deposit products include noninterest-bearing and interest-bearing checking accounts, as well as savings accounts. Its lending portfolio currently consists primarily of real-estate secured loans, with a significant portion being loans secured by first liens on single family residential properties in the Washington, D.C. area. The Bank offers tailored financial solutions to individuals, families, businesses, non-profit organizations, and political organizations nationwide. The term “political organizations” refers to: campaign committees; party committees; separate segregated funds (including trade association political action committees (“PACs”) and corporate PACs); non-connected committees (including independent expenditure-only committees (“Super PACs”), committees maintaining separate accounts for direct contributions and independent expenditures (“Hybrid PACs”), and committees other than authorized campaign committees, or those affiliated with such committees that are maintained or controlled by a candidate or federal officeholder (collectively, “Leadership PACs”)); and other tax-exempt organizations under Section 527 of the Internal Revenue Code. Basis of Presentation The accompanying unaudited interim consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) for interim financial information. The statements do not include all of the information and footnotes required by GAAP for complete financial statements. In the opinion of the Company’s management, all adjustments, consisting only of normal recurring adjustments, which are necessary for a fair presentation of the consolidated financial statements, have been included. These unaudited interim consolidated financial statements should be read in conjunction with the Company’s audited consolidated financial statements for the year ended December 31, 2024 and the accompanying notes thereto, included in the Company’s Annual Report on Form 10-K, filed with the SEC on March 21, 2025 (“Form 10-K”). The results of operations for the three and six months ended June 30, 2025 are not necessarily indicative of the results to be expected for any other interim period or for the full year. Principles of Consolidation The consolidated financial statements include the accounts of Chain Bridge Bancorp, Inc. and its wholly-owned subsidiary, Chain Bridge Bank, National Association. All significant intercompany balances and transactions have been eliminated in consolidation. Reclassification Certain amounts reported in the prior year may be reclassified to conform to the current year’s presentation. Certain expenses, previously included in the “marketing and business development costs” component of noninterest expense on the consolidated statements of income, have been reclassified to the “other operating expenses” component of noninterest expense to provide comparability between periods. None of those reclassifications had an impact on stockholders’ equity or net income. There were no other reclassifications for the periods reported. Segment Reporting The Company operates as a single reportable segment. The Company’s chief operating decision-makers, including senior management and the Board of Directors, evaluate financial performance and allocate resources on a consolidated basis. Although the Company offers a variety of financial products and services, including deposit accounts, loans, treasury management, and trust and wealth management services, management considers these activities to be components of a single business unit. Individual financial results of specific product lines or services are not separately reviewed by senior management for the purpose of making operating decisions. Accordingly, the Company has determined that it operates in one reportable segment under applicable accounting guidance. Significant Accounting Policies The accounting and reporting policies of the Company are in accordance with GAAP and conform to general practices within the banking industry. The Company’s significant accounting policies are described in Note 1 of the “Notes to the Consolidated Financial Statements” included in the audited consolidated financial statements for the fiscal year ended December 31, 2024, contained within the Company’s Form 10-K. There have been no significant changes to the application of significant accounting policies since December 31, 2024. In preparing financial statements in conformity with GAAP, management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities as of the date of the balance sheet and reported amounts of revenues and expenses during the reporting period. Estimates are evaluated on an ongoing basis. Actual results could differ from those estimates. Material estimates that are particularly susceptible to significant change in the near term relate to the determination of the allowance for credit losses (“ACL”) on loans and fair value of investment securities. Recent Accounting Pronouncements In December 2023, the FASB issued ASU 2023-09, “Income Taxes (Topic 740): Improvements to Income Tax Disclosures.” The amendments in this ASU require an entity to disclose specific categories in the rate reconciliation and provide additional information for reconciling items that meet a quantitative threshold, which is greater than five percent of the amount computed by multiplying pretax income by the entity’s applicable statutory rate, on an annual basis. Additionally, the amendments in this ASU require an entity to disclose the amount of income taxes paid (net of refunds received) disaggregated by federal, state, and foreign taxes and the amount of income taxes paid (net of refunds received) disaggregated by individual jurisdictions that are equal to or greater than five percent of total income taxes paid (net of refunds received). Lastly, the amendments in this ASU require an entity to disclose income (or loss) from continuing operations before income tax expense (or benefit) disaggregated between domestic and foreign and income tax expense (or benefit) from continuing operations disaggregated by federal, state, and foreign. This ASU is effective for annual periods beginning after December 15, 2024. Early adoption is permitted. The amendments should be applied on a prospective basis; however, retrospective application is permitted. The Company does not expect the adoption of ASU 2023-09 to have a material impact on its consolidated financial statements for the year ended December 31, 2025. In November 2024, the FASB issued ASU 2024-03, “Income Statement—Reporting Comprehensive Income—Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses.” ASU 2024-03 requires public companies to disclose, in the notes to the financial statements, specific information about certain costs and expenses at each interim and annual reporting period. This includes disclosing amounts related to employee compensation, depreciation, and intangible asset amortization. In addition, public companies will need to provide qualitative description of the amounts remaining in relevant expense captions that are not separately disaggregated quantitatively. ASU 2024-03 is effective for public business entities for annual reporting periods beginning after December 15, 2026, and interim reporting periods beginning after December 15, 2027. Implementation of ASU 2024-03 may be applied prospectively or retrospectively. The Company does not expect the adoption of ASU 2024-03 to have a material impact on its consolidated financial statements. In January 2025, the FASB issued ASU 2025-01, “Income Statement – Reporting Comprehensive Income – Expense Disaggregation Disclosures (Subtopic 220-40): Clarifying the Effective Date.” ASU 2025-01 amends the effective date of ASU 2024-03 to clarify that all public business entities are required to adopt the guidance in annual reporting periods beginning after December 15, 2026, and interim periods within annual reporting periods beginning after December 15, 2027. Early adoption of ASU 2024-03 is permitted. The Company does not expect the adoption of ASU 2025-01 to have a material impact on its consolidated financial statements. Other accounting standards that have been issued by the FASB or other standard setting bodies are not currently expected to have material effect on the Company’s financial position, results of operations or cash flows.