XML 17 R1.htm IDEA: XBRL DOCUMENT v3.25.1
Cover Page - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Mar. 20, 2025
Document Information [Line Items]    
Document Type 10-K  
Document Annual Report true  
Document Period End Date Dec. 31, 2024  
Current Fiscal Year End Date --12-31  
Document Transition Report false  
Entity File Number 001-42302  
Entity Registrant Name Chain Bridge Bancorp, Inc.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 20-4957796  
Entity Address, Address Line One 1445-A  
Entity Address, Address Line Two Laughlin Avenue  
Entity Address, City or Town McLean  
Entity Address, State or Province VA  
Entity Address, Postal Zip Code 22101  
City Area Code 703  
Local Phone Number 748-2005  
Title of 12(b) Security Class A common stock, par value $0.01 per share  
Trading Symbol CBNA  
Security Exchange Name NYSE  
Entity Well-known Seasoned Issuer No  
Entity Voluntary Filers No  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company true  
Entity Ex Transition Period true  
ICFR Auditor Attestation Flag false  
Document Financial Statement Error Correction [Flag] false  
Entity Shell Company false  
Entity Public Float $ 75,948  
Documents Incorporated by Reference Portions of Chain Bridge Bancorp, Inc.’s Proxy Statement to be filed with the United States Securities and Exchange Commission in connection with Chain Bridge Bancorp, Inc.’s 2025 Annual Meeting of Stockholders are incorporated by reference into Part III of this Form 10-K.  
Entity Central Index Key 0001392272  
Amendment Flag false  
Document Fiscal Year Focus 2024  
Document Fiscal Period Focus FY  
Class A Common Stock    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   3,119,317
Class B Common Stock    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   3,442,500