Cover Page - shares	6 Months Ended
	Jun. 30, 2022	Aug. 05, 2022
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2022
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
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
Entity Shell Company	false
Title of 12(b) Security	Common Stock, par value $0.01 per share
Trading Symbol	CBNK
Security Exchange Name	NASDAQ
Entity Common Stock, Shares Outstanding		14,034,490
Amendment Flag	false
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q2
Entity Central Index Key	0001419536
Current Fiscal Year End Date	--12-31