75000 - Document - Document and Entity Information link:presentationLink link:calculationLink link:definitionLink 75010 - Statement - Statements of Net Assets Available for Benefits link:presentationLink link:calculationLink link:definitionLink 75020 - Statement - Statement of Changes in Net Assets Available for Benefits link:presentationLink link:calculationLink link:definitionLink 75030 - Disclosure - Description of Plan link:presentationLink link:calculationLink link:definitionLink 75040 - Disclosure - Summary of Significant Accounting Policies link:presentationLink link:calculationLink link:definitionLink 75050 - Disclosure - Notes Receivable from Participants link:presentationLink link:calculationLink link:definitionLink 75060 - Disclosure - Plan Termination link:presentationLink link:calculationLink link:definitionLink 75070 - Disclosure - Party in Interest Transactions link:presentationLink link:calculationLink link:definitionLink 75080 - Disclosure - Tax Status link:presentationLink link:calculationLink link:definitionLink 75090 - Disclosure - Fair Value Measurement link:presentationLink link:calculationLink link:definitionLink 75100 - Disclosure - Guaranteed Investment Contract with Empower link:presentationLink link:calculationLink link:definitionLink 75110 - Disclosure - Risks and Uncertainties link:presentationLink link:calculationLink link:definitionLink 75120 - Disclosure - Schedule H link:presentationLink link:calculationLink link:definitionLink 75130 - Disclosure - Summary of Significant Accounting Policies (Policies) link:presentationLink link:calculationLink link:definitionLink 75140 - Disclosure - Fair Value Measurement (Tables) link:presentationLink link:calculationLink link:definitionLink 75150 - Disclosure - Schedule H (Tables) link:presentationLink link:calculationLink link:definitionLink 75160 - Disclosure - Description of Plan - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 75170 - Disclosure - Notes Receivable from Participants - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 75180 - Disclosure - Tax Status - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 75190 - Disclosure - Fair Value Measurement - Summary of Level within Fair Value Hierarchy, Plan's Assets at Fair Value (Details) link:presentationLink link:calculationLink link:definitionLink 75200 - Disclosure - Guaranteed Investment Contract with Empower - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 75210 - Disclosure - Schedule H, Line 4(a) - Schedule of Delinquent Participant Contributions (Details) link:presentationLink link:calculationLink link:definitionLink 75220 - Disclosure - Schedule H, Line 4(i) - Schedule of Assets (Held at End of Year) (Details) link:presentationLink link:calculationLink link:definitionLink 75220 - Disclosure - Schedule H, Line 4(i) - Schedule of Assets (Held at End of Year) (Details) [Default] link:presentationLink link:calculationLink link:definitionLink EBP, Change in Net Asset Available for Benefit, Increase [Abstract] Additions of net assets attributed to: EBP, Change in Net Asset Available for Benefit, Decrease from Payment to Participant Benefits paid to participants Benefits paid to participants EBP, Allocation Status [Domain] Fair Value, Inputs, Level 2 [Member] Level 2 EBP, Related Party and Party-in-Interest Transactions [Line Items] Document Fiscal Period Focus EBP, Tax Status [Abstract] EBP, Description of Plan [Text Block] Description of Plan Interest income on notes receivable from participants EBP, Change in Net Asset Available for Benefit, Increase from Interest Income on Note Receivable from Participant Interest income on notes receivable from participants Investment, Identifier [Axis] Administrative expenses EBP, Change in Net Asset Available for Benefit, Decrease from Administrative Expense Administrative expenses EBP, Description of Plan [Line Items] EBP, Debt, Interest Rate Prime rate EBP, Employer Contribution, Matching Percentage Participants' contributions EBP, Investment, Issuer Name [Extensible Enumeration] EBP, Investment, Fair Value and NAV [Abstract] EBP, Accounting Policy [Line Items] Employee Benefit Plan Notes Receivable from Participants Abstract Employee Benefit Plan Notes Receivable from Participants. EBP, Schedule of Asset Held for Investment [Table] EBP, Statement of Net Asset Available for Benefit [Line Items] Match True-Up Contribution Match True-Up Contribution [Member] Match true-up contribution, member. EBP, Allocation Status [Axis] Employee Benefit Plan Guaranteed Investment Contract with Empower Abstract Employee Benefit Plan Guaranteed Investment Contract with Empower. Maximum loan amount EBP, Note Receivable from Participant, Account, Maximum Borrowing, Amount Common Collective Trusts, at Net Asset Value Common Collective Trust [Member] Common Collective Trusts Amendment Flag Employer contributions EBP, Change in Net Asset Available for Benefit, Increase from Employer Contribution, Cash and Noncash EBP, Change in Net Asset Available for Benefit, Increase from Employer Contribution, Cash and Noncash, Total Deductions from net assets attributed to: EBP, Change in Net Asset Available for Benefit, Decrease [Abstract] EBP, Note Receivable from Participant, Account, Minimum Borrowing, Amount Minimum loan amount Payment of Benefits EBP, Payment to Participant [Policy Text Block] Total investments EBP, Investment, Excluding Plan Interest in Master Trust, Fair and Contract Value EBP, Schedule of Delinquent Participant Contribution [Line Items] Contributions receivable EBP, Participant Contribution, Receivable EBP, Schedule of Asset Held for Investment [Line Items] Fair Value Hierarchy and NAV [Axis] EBP, Investment, Current Value, Type [Extensible Enumeration] Investment Type [Axis] Document Type Entity Central Index Key Forfeited non-vested accounts amount Employee Benefit Plan Forfeited Non-Vested Accounts Amount Employee benefit plan forfeited non-vested accounts amount. Investment Valuation and Income Recognition EBP, Investment [Policy Text Block] EBP, Accounting Policy [Table] Basis of Presentation EBP, Basis of Accounting [Policy Text Block] Uncertain tax positions taken Employee benefit plan, uncertain tax positions taken Employee benefit plan, uncertain tax positions taken. EBP, Description of Plan [Table] Contributions Pending Correction in Voluntary Fiduciary Correction Program EBP, Schedule of Delinquent Participant Contribution, Pending Correction in VFCP EBP, Employer, Common Stock [Member] Unity Bancorp, Inc. Common Stock Interest and dividends EBP, Change in Net Asset Available for Benefit, Increase from Interest and Dividend Income on Investment EBP, Change in Net Asset Available for Benefit, Increase from Interest and Dividend Income on Investment, Total Two Percenatge of Eligible Compensation [Member] 2% of eligible compensation, member. 2% of Eligible Compensation EBP, Investment, Excluding Plan Interest in Master Trust, Cost Cost EBP, Investment, Fair Value [Abstract] Investments, at fair value: (See note 7) Notes Receivable from Participants Employee Benefit Plan Notes Receivable from Participants [Text Block] Employee Benefit Plan Notes Receivable from Participants. Minimum [Member] Minimum EBP, Related Party and Party-in-Interest Transactions [Text Block] Party in Interest Transactions Total additions EBP, Change in Net Asset Available for Benefit, Increase Level 3 Fair Value, Inputs, Level 3 [Member] Total contributions EBP, Change in Net Asset Available for Benefit, Increase from Contribution EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] EBP, Schedule of Delinquent Participant Contribution, Transferred Late to Plan Participant Contributions Transferred Late to Plan Employee Benefit Plan Guaranteed Investment Contract With Empower [Table] Employee Benefit Plan Guaranteed Investment Contract With Empower. EBP, Expense [Policy Text Block] Administrative Expenses EBP, Statement of Net Asset Available for Benefit [Abstract] EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Excluding Rollover Employee contributions EBP, Change in Net Asset Available for Benefit, Increase from Contribution [Abstract] Contributions: EBP, Tax Determination Letter, Date Tax determination letter date Percentage increase per year of participant's pre-tax elective deferrals EBP, Participant Contribution, Automatic, Deferral Rate EBP, Tax Qualification Status [Extensible Enumeration] EBP, Related Party and Party-in-Interest Transactions [Abstract] EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value, Ending Balance EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value, Beginning Balance EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value, Total Total investments at fair value Investments, at fair value Employee Benefit Plan Notes Receivable From Participants [Line Items] Employee Benefit Plan Notes Receivable From Participants. EBP, Use of Estimate [Policy Text Block] Use of Estimates Mutual Fund [Member] Mutual Funds Entity [Domain] Additions: Additions [Abstract] Additions abstract. EBP, Summary of Accounting Policy [Text Block] Summary of Significant Accounting Policies Pooled Separate Accounts, at Net Asset Value EBP, Pooled Separate Account [Member] Pooled Separate Accounts EBP, Investment, Fair Value and NAV [Text Block] Fair Value Measurement EBP, Description of Plan and Accounting Change [Abstract] Participant loans, current value EBP, Asset Held for Investment, Participant Loan, after Deemed Distribution EBP, Statement of Change in Net Asset Available for Benefit [Line Items] Statistical Measurement [Domain] EBP, Note Receivable from Participant Notes receivable from participants Document Period End Date EBP, Risk and Uncertainty [Table] Fair Value Hierarchy and NAV [Domain] EBP, Related Party and Party-in-Interest Transactions [Table] EBP, Plan Termination [Text Block] Plan Termination Percentage of eligible participants automatically enrolled in plan Employee Benefit Plan Percentage Of Eligible Participants Automatically Enrolled In Plan Employee benefit plan percentage of eligible participants automatically enrolled in plan. EBP, Subsequent Event [Policy Text Block] Subsequent Events Participants Contributions [Member] Participants contributions member. Participants Contributions EBP, Schedule of Delinquent Participant Contribution, Corrected Total Fully Corrected Under Voluntary Fiduciary Correction Program and PTE 2002-51 Cover [Abstract] Investments [Domain] Investment income: EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Income (Loss) on Investment [Abstract] EBP, Risk and Uncertainty [Abstract] Four Percentage of Eligible Compensation [Member] 4% of eligible compensation, member. 4% of Eligible Compensation Employee Benefit Plan Minimum Guaranteed Interest Rate Employee Benefit Plan Minimum Guaranteed Interest Rate. Minimum guaranteed interest rate EBP, Net Asset Available for Benefit Balance, end of year Balance, beginning of year Net assets available for benefits Summary of Level within Fair Value Hierarchy, Plan's Assets at Fair Value EBP, Investment, Fair Value and NAV [Table Text Block] Employee Benefit Plan Retirement Age Employee benefit plan retirement age. Retirement age EBP, Net Asset Available for Benefit [Abstract] Net assets available for benefits: EBP, Schedule of Asset Held for Investment [Abstract] EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value Current Value EBP, Note Receivable from Participant [Policy Text Block] Notes Receivable from Participants EBP, Schedule of Asset Held for Investment [Table Text Block] Schedule of Assets (Held at End of Year) EBP, Statement of Net Asset Available for Benefit [Table] Document Fiscal Year Focus Net appreciation in fair value of investments EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Gain (Loss) on Investment EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Gain (Loss) on Investment, Total Eligible compensation EBP, Employer Contribution, Participant Compensation Matched, Percentage EBP, Statement of Change in Net Asset Available for Benefit [Table] EBP, Investment, Contract Value [Abstract] Investments, at contract value: (See note 8) EBP, Contribution [Policy Text Block] Contributions Employee Benefit Plan Notes Receivable from Participants [Table] Employee Benefit Plan Notes Receivable from Participants. Safe Harbor Basic Matching Contributions [Member] Safe harbor basic matching contributions, member. Safe Harbor Basic Matching Contributions EBP, Schedule of Delinquent Participant Contribution [Abstract] EBP, Participant Contribution, Pretax, Maximum Annual Compensation to Total Compensation, Percentage Percentage of base compensation upto which participant can contribute Plan number EBP, Plan Number EBP, Investment, Fair Value and NAV [Line Items] Legal Entity [Axis] Employee Benefit Plan Age Before End of Plan Year Eligible to make Catch-Up Contributions Employee benefit plan age before end of plan year eligible to make catch-up contributions. Age before end of plan year eligible to make catch-up contributions EBP, Risk and Uncertainty [Line Items] EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Income (Loss) on Investment Net investment income Employee Benefit Plan Guaranteed Investment Contract With Empower [Line Items] Employee Benefit Plan Guaranteed Investment Contract With Empower [Line Items] Employee Benefit Plan Participant Deferrals and Repayments on Notes Receivable Employee benefit plan participant deferrals and repayments on notes receivable. Participant deferrals and repayments on notes receivable EBP, Investment, Fair Value and NAV [Table] EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Rollover Employee rollovers EBP 001 EBP 001 [Member] EBP 001 member. EBP, Accounting Policy, Accounting Standard Update, and Change in Accounting Principle [Abstract] EBP, Asset Held for Investment EBP, Asset Held for Investment, Total Current Value Employee Benefit Plan Income Tax Expense (Benefit) Employee Benefit Plan Income Tax Expense (Benefit). Provision for income taxes Tax Status EBP, Tax Status [Text Block] Contributions not Corrected EBP, Schedule of Delinquent Participant Contribution, Not Corrected Maximum [Member] Maximum Statistical Measurement [Axis] EBP, Statement of Change in Net Asset Available for Benefit [Abstract] Contributions Corrected Outside of Voluntary Fiduciary Correction Program EBP, Schedule of Delinquent Participant Contribution, Corrected Outside VFCP Entity Registrant Name Employee Benefit Plan Participant Age For Distribution Not Subject To Penalty Employee benefit plan participant age for distribution not subject to penalty. Age requirement for penalty free distribution Interest rates for loans to participants (as a percent) EBP, Asset Held for Investment, Participant Loan, Interest Rate Participant Loans Interest Rate Employee Benefit Plan Guaranteed Investment Contract With Empower [Text Block] Employee Benefit Plan Guaranteed Investment Contract With Empower. Guaranteed Investment Contract with Empower EBP, Schedule of Delinquent Participant Contribution [Table Text Block] Schedule of Delinquent Participant Contributions Deductions [Abstract] Deductions abstract. Deductions: Risks and Uncertainties EBP, Risk and Uncertainty [Text Block] EBP, Change in Net Asset Available for Benefit, Decrease Total deductions Total deductions EBP, Schedule of Delinquent Participant Contribution [Table] Fair Value, Inputs, Level 1 [Member] Level 1 Eligible Compensation Eligible Compensation [Member] Eligible Compensation member. Guaranteed Investment Contract Guaranteed Investment Contract [Member] Employee Benefit Plan Discretionary Employer Contributions Employee benefit plan discretionary employer contributions. Discretionary employer contributions EBP, Tax Status [Line Items] Entity tax identification number Entity Tax Identification Number Net increase EBP, Change in Net Asset Available for Benefit, Increase (Decrease) EBP, Tax Status [Table] EBP, Investment, Excluding Plan Interest in Master Trust, Contract Value Investments, at contract value Employee Benefit Plan, Schedule of Assets Held for Investment Purposes at End Of Year [Text Block] Employee benefit plan, schedule of assets held for investment purposes at end of year text block. Schedule H EBP, Description, Available [true false] EBP, Asset Held for Investment, Party-in-Interest [true false] PGIM Select Real Estate Fund CIT Class R member. Blackrock Lifepath Index Retirement K [Member] Fidelity Intl Idx member. Large Cap Value Fund CL R1, member. Fidelity 500 Index Fund member. JPMorgan Inc Fd Class R6 [Member] Am Cent Mid Cap Value [Member] Blackrock Lifepath 2045 K [Member] Fidelity Mid Cap Index member. Guaranteed Income Fund [Member] Mid Cap Growth Fund R1 [Member] Fidelity Mid Cap Index [Member] Large Cap Value Fund CL R1 [Member] Lcg/Jennison Fund member. Pru Long Corp Bond - Isp [Member] Blackrock Lifepath 2035 K [Member] Fidelity Inflation Protected Bond Index [Member] Brdywngbl Gbl Opp Bond Is member. Fidelity Inflation Protected Bond Index, member. Mid Cap Growth Fund R1 member. Fidelity 500 Index Fund [Member] Lcg/Jennison Fund [Member] Pru Long Corp Bond - Isp member. Guaranteed Income Fund member. Fidelity Intl Idx [Member] DFA Emerging Markets Core Equity I member. DFA US Targeted Value I [Member] PGIM Select Real Estate Fund CIT Class R [Member] Putnam Small Cap Growth Trust Class R [Member] Blackrock Lifepath 2045 K member. Blackrock Lifepath 2050 K [Member] Pimco Comrealret Strat I member. Am Cent Mid Cap Value member. Blackrock Lifepath 2050 K member. DFA US Targeted Value I member. Ishares US Aggregate Bond Index K [Member] Blackrock Lifepath 2035 K [Member] Blackrock Lifepath 2040 K member. Unity Bancorp, Inc. member. DFA Emerging Markets Core Equity I [Member] JPMorgan Inc Fd Class R6 member. Blackrock Lifepath Index Retirement K member. Unity Bancorp, Inc. [Member] Blackrock Lifepath 2040 K [Member] Ishares US Aggregate Bond Index K member. Putnam Small Cap Growth Trust Class R member. Pimco Comrealret Strat I [Member] Fidelity Small Cap Index [Member] Fidelity Small Cap Index member. Brdywngbl Gbl Opp Bond Is [Member]