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Cover Page - shares
 3 Months Ended
Mar. 31, 2022
May 20, 2022
Document Information [Line Items]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Mar. 31, 2022  
Document Fiscal Year Focus 2022  
Document Fiscal Period Focus Q1  
Current Fiscal Year End Date --12-31  
Entity Registrant Name Atlantic Coastal Acquisition Corp. II  
Entity Central Index Key 0001893219  
Entity Filer Category Non-accelerated Filer  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Document Quarterly Report true  
Document Transition Report false  
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 File Number 001-41224  
Entity Tax Identification Number 85-1013956  
City Area Code 248  
Local Phone Number 890-7200  
Entity Small Business true  
Entity Emerging Growth Company true  
Entity Ex Transition Period false  
Entity Shell Company true  
Title of 12(b) Security Shares of Series A common stock included as part of the units  
Trading Symbol ACAB  
Security Exchange Name NASDAQ  
Capital Units [Member]    
Document Information [Line Items]    
Title of 12(b) Security Units, each consisting of one share of Series A common stock, $0.0001 par value, and one-half of one redeemable warrant  
Trading Symbol ACABU  
Security Exchange Name NASDAQ  
Warrant [Member]    
Document Information [Line Items]    
Title of 12(b) Security Warrants included as part of the units, each whole warrant exercisable for one share of Series A common stock at an exercise price of $11.50  
Trading Symbol ACABW  
Security Exchange Name NASDAQ  
Series A common stock    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   30,000,000
Series B common stock    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   7,500,000