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Cover Page
 12 Months Ended
Dec. 31, 2023
Document Information [Line Items]  
Document Type S-4/A
Amendment Flag false
Entity Registrant Name Atlantic Coastal Acquisition Corp. II
Entity Central Index Key 0001893219
Entity Filer Category Non-accelerated Filer
Entity Incorporation, State or Country Code DE
Entity Address, Address Line One 6 St Johns Lane, Floor 5
Entity Address, City or Town New York
Entity Address, State or Province NY
Entity Address, Postal Zip Code 10013
Entity Tax Identification Number 87-1013956
City Area Code 248
Local Phone Number 890-7200
Entity Small Business true
Entity Emerging Growth Company true
Entity Ex Transition Period false
Entity Primary SIC Number 6770
Business Contact [Member]  
Document Information [Line Items]  
Entity Address, Address Line One 6 St Johns Lane, Floor 5
Entity Address, City or Town New York
Entity Address, State or Province NY
Entity Address, Postal Zip Code 10013
City Area Code 248
Local Phone Number 890-7200
Contact Personnel Name Shahraab Ahmad