Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2023	Aug. 11, 2023
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2023
Document Fiscal Period Focus	Q2
Document Fiscal Year Focus	2023
Entity Registrant Name	ECB Bancorp, Inc.
Entity Central Index Key	0001914605
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Common Stock, Shares Outstanding		9,175,247
Title of 12(b) Security	Common Stock, $0.01 par value
Trading Symbol	ECBK
Security Exchange Name	NASDAQ
Document Quarterly Report	true
Document Transition Report	false
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Shell Company	false
Entity File Number	001-41456
Entity Tax Identification Number	88-1502079
Entity Address, Address Line One	419 Broadway
Entity Address, City or Town	Everett
Entity Address, State or Province	MA
Entity Address, Postal Zip Code	02149
City Area Code	617
Local Phone Number	387-1110
Entity Incorporation, State or Country Code	MD