v3.26.1
Fair Value Measurement - Summary of Level within Fair Value Hierarchy, Plan's Assets at Fair Value (Details) - EBP 001 - USD ($)
Dec. 31, 2025
Dec. 31, 2024
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value $ 21,419,952 $ 17,956,566
Unity Bancorp, Inc. Common Stock    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 1,915,875 1,672,817
Mutual Funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 7,583,459 6,023,064
Common Collective Trusts, at Net Asset Value    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 4,697,346 3,841,627
Pooled Separate Accounts, at Net Asset Value    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 7,223,272 6,419,058
Level 1    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 9,499,334 7,695,881
Level 1 | Unity Bancorp, Inc. Common Stock    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 1,915,875 1,672,817
Level 1 | Mutual Funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 7,583,459 6,023,064
Level 1 | Common Collective Trusts, at Net Asset Value    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 0 0
Level 1 | Pooled Separate Accounts, at Net Asset Value    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 0 0
Level 2    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 0 0
Level 2 | Unity Bancorp, Inc. Common Stock    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 0 0
Level 2 | Mutual Funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 0 0
Level 2 | Common Collective Trusts, at Net Asset Value    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 0 0
Level 2 | Pooled Separate Accounts, at Net Asset Value    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 0 0
Level 3    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 0 0
Level 3 | Unity Bancorp, Inc. Common Stock    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 0 0
Level 3 | Mutual Funds    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 0 0
Level 3 | Common Collective Trusts, at Net Asset Value    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value 0 0
Level 3 | Pooled Separate Accounts, at Net Asset Value    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments at fair value $ 0 $ 0