v3.22.0.1
Cover Page - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Mar. 11, 2022
Jun. 30, 2021
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2021    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 001-38671    
Entity Registrant Name CAPITAL BANCORP, INC    
Entity Incorporation, State or Country Code MD    
Entity Tax Identification Number 52-2083046    
Entity Address, Address Line One 2275 Research Boulevard    
Entity Address, Address Line Two Suite 600    
Entity Address, City or Town Rockville    
Entity Address, State or Province MD    
Entity Address, Postal Zip Code 20850    
City Area Code 301    
Local Phone Number 468-8848    
Title of 12(b) Security Common Stock, par value $0.01 per share    
Trading Symbol CBNK    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company true    
Entity Ex Transition Period true    
ICFR Auditor Attestation Flag false    
Entity Shell Company false    
Entity Public Float     $ 158.2
Entity Common Stock, Shares Outstanding   13,999,609  
Documents Incorporated by Reference
DOCUMENTS INCORPORATED BY REFERENCE
The information required by Items 10, 11, 12, 13 and 14 of Part III of this Annual Report on Form 10-K will be found in the Company’s definitive proxy statement for its 2021 Annual Meeting of Stockholders, to be filed pursuant to Regulation 14A under the Securities Exchange Act of 1934, as amended, and such information is incorporated herein by this reference.
    
Amendment Flag false    
Document Fiscal Year Focus 2021    
Document Fiscal Period Focus FY    
Entity Central Index Key 0001419536