Organization and Summary of Significant Accounting Policies	9 Months Ended
	Sep. 30, 2024
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 is the registered bank holding company for Chain Bridge Bank, National Association (the “Bank”). Both the Company and Bank have their headquarters and sole executive office in McLean, Virginia. The Bank operates a model that combines electronic banking channels with its physical banking headquarters in McLean, Virginia, allowing it to serve clients nationally. The Bank provides a wide range of commercial and personal banking services, including deposit accounts, mortgage financing, various loan products, trust administration, wealth management, and asset custody. The core deposit products offered by the Bank include noninterest-bearing and interest-bearing checking accounts, along with savings accounts. The Bank’s lending portfolio is comprised primarily of mortgage-related loans, with the majority being consumer residential mortgages in the Washington, D.C. area. The Bank offers tailored solutions to individuals, families, businesses, non-profit organizations, and political organizations. 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 therewith, maintained or controlled by a candidate or federal officeholder (“Leadership PACs”)), and other tax-exempt 527 organizations. 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, 2023 and the notes thereto. The results of operations for the nine months ended September 30, 2024 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 prior years may be reclassified to conform to the current year’s presentation. There were no reclassifications for the periods reported. 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 the Note 1 of the “Notes to the Consolidated Financial Statements” included in the audited consolidated financial statements for the fiscal year ended December 31, 2023. There have been no significant changes to the application of significant accounting policies since December 31, 2023. 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 held to maturity debt securities. Recent Accounting Pronouncements In December 2023, the Financial Accounting Standards Board (“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. 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. 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.