v3.25.2
Document And Entity Information - shares
 6 Months Ended
Jun. 30, 2025
Aug. 07, 2025
Document Information [Line Items]    
Entity Central Index Key 0001914605  
Entity Registrant Name ECB Bancorp, Inc. /MD/  
Amendment Flag false  
Current Fiscal Year End Date --12-31  
Document Fiscal Period Focus Q2  
Document Fiscal Year Focus 2025  
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2025  
Document Transition Report false  
Entity File Number 001-41456  
Entity Incorporation, State or Country Code MD  
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  
Title of 12(b) Security Common Stock, $0.01 par value  
Trading Symbol ECBK  
Security Exchange Name NASDAQ  
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 false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   8,851,046