v3.25.2
Document and Entity Information - shares
6 Months Ended
Jun. 30, 2025
Jul. 31, 2025
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2025  
Document Transition Report false  
Securities Act File Number 1-12431  
Entity Registrant Name Unity Bancorp, Inc.  
Entity Incorporation, State or Country Code NJ  
Entity Tax Identification Number 22-3282551  
Entity Address, Address Line One 64 Old Highway 22  
Entity Address, City or Town Clinton  
Entity Address, State or Province NJ  
Entity Address, Postal Zip Code 08809  
City Area Code 800  
Local Phone Number 618-2265  
Title of 12(b) Security Common stock  
Trading Symbol UNTY  
Security Exchange Name NASDAQ  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   10,033,030
Entity Central Index Key 0000920427  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2025  
Document Fiscal Period Focus Q2  
Amendment Flag false