<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.25.3</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>413</ContextCount>
  <ElementCount>343</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>true</FootnotesReported>
  <SegmentCount>60</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>6</UnitCount>
  <MyReports>
    <Report instance="unty-20250930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>995200090 - Document - Document and Entity Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unitybank.com/role/DocumentDocumentAndEntityInformation</Role>
      <ShortName>Document and Entity Information</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="unty-20250930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>995200100 - Statement - Consolidated Balance Sheets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unitybank.com/role/StatementConsolidatedBalanceSheets</Role>
      <ShortName>Consolidated Balance Sheets</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="unty-20250930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>995200105 - Statement - Consolidated Balance Sheets (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unitybank.com/role/StatementConsolidatedBalanceSheetsParenthetical</Role>
      <ShortName>Consolidated Balance Sheets (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="unty-20250930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>995200200 - Statement - Consolidated Statements of Income</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unitybank.com/role/StatementConsolidatedStatementsOfIncome</Role>
      <ShortName>Consolidated Statements of Income</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="unty-20250930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>995200300 - Statement - Consolidated Statements of Comprehensive Income</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unitybank.com/role/StatementConsolidatedStatementsOfComprehensiveIncome</Role>
      <ShortName>Consolidated Statements of Comprehensive Income</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="unty-20250930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>995200400 - Statement - Consolidated Statements of Changes in Shareholders' Equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unitybank.com/role/StatementConsolidatedStatementsOfChangesInShareholdersEquity</Role>
      <ShortName>Consolidated Statements of Changes in Shareholders' Equity</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="unty-20250930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>995200405 - Statement - Consolidated Statements of Changes in Shareholders' Equity (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unitybank.com/role/StatementConsolidatedStatementsOfChangesInShareholdersEquityParenthetical</Role>
      <ShortName>Consolidated Statements of Changes in Shareholders' Equity (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="unty-20250930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>995200500 - Statement - Consolidated Statements of Cash Flows</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unitybank.com/role/StatementConsolidatedStatementsOfCashFlows</Role>
      <ShortName>Consolidated Statements of Cash Flows</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="unty-20250930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>995210101 - Disclosure - Significant Accounting Policies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unitybank.com/role/DisclosureSignificantAccountingPolicies</Role>
      <ShortName>Significant Accounting Policies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="unty-20250930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>995210201 - Disclosure - Litigation</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unitybank.com/role/DisclosureLitigation</Role>
      <ShortName>Litigation</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="unty-20250930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>995210301 - Disclosure - Net Income per Share</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unitybank.com/role/DisclosureNetIncomePerShare</Role>
      <ShortName>Net Income per Share</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="unty-20250930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>995210401 - Disclosure - Other Comprehensive (Loss) Income</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unitybank.com/role/DisclosureOtherComprehensiveLossIncome</Role>
      <ShortName>Other Comprehensive (Loss) Income</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="unty-20250930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>995210501 - Disclosure - Fair Value</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unitybank.com/role/DisclosureFairValue</Role>
      <ShortName>Fair Value</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="unty-20250930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>995210601 - Disclosure - Securities</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unitybank.com/role/DisclosureSecurities</Role>
      <ShortName>Securities</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="unty-20250930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>995210701 - Disclosure - Loans</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unitybank.com/role/DisclosureLoans</Role>
      <ShortName>Loans</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="unty-20250930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>995210801 - Disclosure - Allowance for Credit Losses and Reserve for Unfunded Loan Commitments</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unitybank.com/role/DisclosureAllowanceForCreditLossesAndReserveForUnfundedLoanCommitments</Role>
      <ShortName>Allowance for Credit Losses and Reserve for Unfunded Loan Commitments</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="unty-20250930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>995210901 - Disclosure - Derivative Financial Instruments and Hedging Activities</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unitybank.com/role/DisclosureDerivativeFinancialInstrumentsAndHedgingActivities</Role>
      <ShortName>Derivative Financial Instruments and Hedging Activities</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="unty-20250930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>995211001 - Disclosure - Regulatory Capital</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unitybank.com/role/DisclosureRegulatoryCapital</Role>
      <ShortName>Regulatory Capital</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="unty-20250930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>995211101 - Disclosure - Subsequent Events</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unitybank.com/role/DisclosureSubsequentEvents</Role>
      <ShortName>Subsequent Events</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="unty-20250930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>995410 - Disclosure - Pay vs Performance Disclosure</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/ecd/role/PvpDisclosure</Role>
      <ShortName>Pay vs Performance Disclosure</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="unty-20250930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>995445 - Disclosure - Insider Trading Arrangements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/ecd/role/InsiderTradingArrangements</Role>
      <ShortName>Insider Trading Arrangements</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="unty-20250930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>99920102 - Disclosure - Significant Accounting Policies (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unitybank.com/role/DisclosureSignificantAccountingPoliciesPolicies</Role>
      <ShortName>Significant Accounting Policies (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <ParentRole>http://www.unitybank.com/role/DisclosureSignificantAccountingPolicies</ParentRole>
      <Position>22</Position>
    </Report>
    <Report instance="unty-20250930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>99930303 - Disclosure - Net Income per Share (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unitybank.com/role/DisclosureNetIncomePerShareTables</Role>
      <ShortName>Net Income per Share (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.unitybank.com/role/DisclosureNetIncomePerShare</ParentRole>
      <Position>23</Position>
    </Report>
    <Report instance="unty-20250930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>99930403 - Disclosure - Other Comprehensive (Loss) Income (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unitybank.com/role/DisclosureOtherComprehensiveLossIncomeTables</Role>
      <ShortName>Other Comprehensive (Loss) Income (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.unitybank.com/role/DisclosureOtherComprehensiveLossIncome</ParentRole>
      <Position>24</Position>
    </Report>
    <Report instance="unty-20250930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>99930503 - Disclosure - Fair Value (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unitybank.com/role/DisclosureFairValueTables</Role>
      <ShortName>Fair Value (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.unitybank.com/role/DisclosureFairValue</ParentRole>
      <Position>25</Position>
    </Report>
    <Report instance="unty-20250930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>99930603 - Disclosure - Securities (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unitybank.com/role/DisclosureSecuritiesTables</Role>
      <ShortName>Securities (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.unitybank.com/role/DisclosureSecurities</ParentRole>
      <Position>26</Position>
    </Report>
    <Report instance="unty-20250930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>99930703 - Disclosure - Loans (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unitybank.com/role/DisclosureLoansTables</Role>
      <ShortName>Loans (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.unitybank.com/role/DisclosureLoans</ParentRole>
      <Position>27</Position>
    </Report>
    <Report instance="unty-20250930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>99930803 - Disclosure - Allowance for Credit Losses and Reserve for Unfunded Loan Commitments (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unitybank.com/role/DisclosureAllowanceForCreditLossesAndReserveForUnfundedLoanCommitmentsTables</Role>
      <ShortName>Allowance for Credit Losses and Reserve for Unfunded Loan Commitments (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.unitybank.com/role/DisclosureAllowanceForCreditLossesAndReserveForUnfundedLoanCommitments</ParentRole>
      <Position>28</Position>
    </Report>
    <Report instance="unty-20250930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>99930903 - Disclosure - Derivative Financial Instruments and Hedging Activities (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unitybank.com/role/DisclosureDerivativeFinancialInstrumentsAndHedgingActivitiesTables</Role>
      <ShortName>Derivative Financial Instruments and Hedging Activities (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.unitybank.com/role/DisclosureDerivativeFinancialInstrumentsAndHedgingActivities</ParentRole>
      <Position>29</Position>
    </Report>
    <Report instance="unty-20250930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>99931003 - Disclosure - Regulatory Capital (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unitybank.com/role/DisclosureRegulatoryCapitalTables</Role>
      <ShortName>Regulatory Capital (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.unitybank.com/role/DisclosureRegulatoryCapital</ParentRole>
      <Position>30</Position>
    </Report>
    <Report instance="unty-20250930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>99940301 - Disclosure - Net Income per Share (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unitybank.com/role/DisclosureNetIncomePerShareDetails</Role>
      <ShortName>Net Income per Share (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.unitybank.com/role/DisclosureNetIncomePerShareTables</ParentRole>
      <Position>31</Position>
    </Report>
    <Report instance="unty-20250930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>99940401 - Disclosure - Other Comprehensive (Loss) Income (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unitybank.com/role/DisclosureOtherComprehensiveLossIncomeDetails</Role>
      <ShortName>Other Comprehensive (Loss) Income (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.unitybank.com/role/DisclosureOtherComprehensiveLossIncomeTables</ParentRole>
      <Position>32</Position>
    </Report>
    <Report instance="unty-20250930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>99940501 - Disclosure - Fair Value - Fair Value on Recurring and Nonrecurring Basis - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unitybank.com/role/DisclosureFairValueFairValueOnRecurringAndNonrecurringBasisNarrativeDetails</Role>
      <ShortName>Fair Value - Fair Value on Recurring and Nonrecurring Basis - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>33</Position>
    </Report>
    <Report instance="unty-20250930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>99940502 - Disclosure - Fair Value - Available for Sale Debt Securities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unitybank.com/role/DisclosureFairValueAvailableForSaleDebtSecuritiesDetails</Role>
      <ShortName>Fair Value - Available for Sale Debt Securities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>34</Position>
    </Report>
    <Report instance="unty-20250930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>99940503 - Disclosure - Fair Value - Assets Measured at Fair Value on a Recurring Basis (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unitybank.com/role/DisclosureFairValueAssetsMeasuredAtFairValueOnRecurringBasisDetails</Role>
      <ShortName>Fair Value - Assets Measured at Fair Value on a Recurring Basis (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>35</Position>
    </Report>
    <Report instance="unty-20250930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>99940504 - Disclosure - Fair Value - Assets and Liabilities Subject to Fair Value Adjustments on a Nonrecurring Basis (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unitybank.com/role/DisclosureFairValueAssetsAndLiabilitiesSubjectToFairValueAdjustmentsOnNonrecurringBasisDetails</Role>
      <ShortName>Fair Value - Assets and Liabilities Subject to Fair Value Adjustments on a Nonrecurring Basis (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>36</Position>
    </Report>
    <Report instance="unty-20250930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>99940505 - Disclosure - Fair Value - Carrying Amount and Fair Values (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unitybank.com/role/DisclosureFairValueCarryingAmountAndFairValuesDetails</Role>
      <ShortName>Fair Value - Carrying Amount and Fair Values (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>37</Position>
    </Report>
    <Report instance="unty-20250930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>99940601 - Disclosure - Securities - Amortized Cost and Fair Value - Available for Sale (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unitybank.com/role/DisclosureSecuritiesAmortizedCostAndFairValueAvailableForSaleDetails</Role>
      <ShortName>Securities - Amortized Cost and Fair Value - Available for Sale (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>38</Position>
    </Report>
    <Report instance="unty-20250930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>99940602 - Disclosure - Securities - Amortized Cost and Fair Value - Held to Maturity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unitybank.com/role/DisclosureSecuritiesAmortizedCostAndFairValueHeldToMaturityDetails</Role>
      <ShortName>Securities - Amortized Cost and Fair Value - Held to Maturity (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>39</Position>
    </Report>
    <Report instance="unty-20250930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>99940603 - Disclosure - Securities - Provision for Credit Loss (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unitybank.com/role/DisclosureSecuritiesProvisionForCreditLossDetails</Role>
      <ShortName>Securities - Provision for Credit Loss (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>40</Position>
    </Report>
    <Report instance="unty-20250930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>99940604 - Disclosure - Securities - Amortized Cost and Fair Value - Modified in Period (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unitybank.com/role/DisclosureSecuritiesAmortizedCostAndFairValueModifiedInPeriodDetails</Role>
      <ShortName>Securities - Amortized Cost and Fair Value - Modified in Period (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>41</Position>
    </Report>
    <Report instance="unty-20250930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>99940605 - Disclosure - Securities - Securities by Contractual Maturity - Available for Sale (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unitybank.com/role/DisclosureSecuritiesSecuritiesByContractualMaturityAvailableForSaleDetails</Role>
      <ShortName>Securities - Securities by Contractual Maturity - Available for Sale (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>42</Position>
    </Report>
    <Report instance="unty-20250930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>99940606 - Disclosure - Securities - Securities by Contractual Maturity - Held to Maturity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unitybank.com/role/DisclosureSecuritiesSecuritiesByContractualMaturityHeldToMaturityDetails</Role>
      <ShortName>Securities - Securities by Contractual Maturity - Held to Maturity (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>43</Position>
    </Report>
    <Report instance="unty-20250930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>99940607 - Disclosure - Securities - Unrealized Loss Position - Fair Value - Available for Sale (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unitybank.com/role/DisclosureSecuritiesUnrealizedLossPositionFairValueAvailableForSaleDetails</Role>
      <ShortName>Securities - Unrealized Loss Position - Fair Value - Available for Sale (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>44</Position>
    </Report>
    <Report instance="unty-20250930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>99940608 - Disclosure - Securities - Unrealized Loss Position - Accumulated Loss - Available for Sale (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unitybank.com/role/DisclosureSecuritiesUnrealizedLossPositionAccumulatedLossAvailableForSaleDetails</Role>
      <ShortName>Securities - Unrealized Loss Position - Accumulated Loss - Available for Sale (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>45</Position>
    </Report>
    <Report instance="unty-20250930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>99940609 - Disclosure - Securities - Unrealized Loss Position - Fair Value - Held to Maturity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unitybank.com/role/DisclosureSecuritiesUnrealizedLossPositionFairValueHeldToMaturityDetails</Role>
      <ShortName>Securities - Unrealized Loss Position - Fair Value - Held to Maturity (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>46</Position>
    </Report>
    <Report instance="unty-20250930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>99940610 - Disclosure - Securities - Unrealized Loss Position - Accumulated Loss - Held to Maturity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unitybank.com/role/DisclosureSecuritiesUnrealizedLossPositionAccumulatedLossHeldToMaturityDetails</Role>
      <ShortName>Securities - Unrealized Loss Position - Accumulated Loss - Held to Maturity (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>47</Position>
    </Report>
    <Report instance="unty-20250930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>99940611 - Disclosure - Securities - Accrued Interest Receivable (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unitybank.com/role/DisclosureSecuritiesAccruedInterestReceivableDetails</Role>
      <ShortName>Securities - Accrued Interest Receivable (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>48</Position>
    </Report>
    <Report instance="unty-20250930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>99940612 - Disclosure - Securities - Realized Gains (Losses) - Available for Sale (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unitybank.com/role/DisclosureSecuritiesRealizedGainsLossesAvailableForSaleDetails</Role>
      <ShortName>Securities - Realized Gains (Losses) - Available for Sale (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>49</Position>
    </Report>
    <Report instance="unty-20250930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>99940613 - Disclosure - Securities - Realized Gains (Losses) - Held to Maturity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unitybank.com/role/DisclosureSecuritiesRealizedGainsLossesHeldToMaturityDetails</Role>
      <ShortName>Securities - Realized Gains (Losses) - Held to Maturity (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>50</Position>
    </Report>
    <Report instance="unty-20250930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>99940614 - Disclosure - Securities - Gains (Losses) of Equity Securities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unitybank.com/role/DisclosureSecuritiesGainsLossesOfEquitySecuritiesDetails</Role>
      <ShortName>Securities - Gains (Losses) of Equity Securities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>51</Position>
    </Report>
    <Report instance="unty-20250930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>99940701 - Disclosure - Loans - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unitybank.com/role/DisclosureLoansNarrativeDetails</Role>
      <ShortName>Loans - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>52</Position>
    </Report>
    <Report instance="unty-20250930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>99940702 - Disclosure - Loans - Classification of Loans by Class (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unitybank.com/role/DisclosureLoansClassificationOfLoansByClassDetails</Role>
      <ShortName>Loans - Classification of Loans by Class (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>53</Position>
    </Report>
    <Report instance="unty-20250930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>99940703 - Disclosure - Loans - Aging Analysis of Past Due and Nonaccrual Loans by Class (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unitybank.com/role/DisclosureLoansAgingAnalysisOfPastDueAndNonaccrualLoansByClassDetails</Role>
      <ShortName>Loans - Aging Analysis of Past Due and Nonaccrual Loans by Class (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>54</Position>
    </Report>
    <Report instance="unty-20250930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>99940704 - Disclosure - Loans - Individually Evaluated Loans with Associated Allowance (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unitybank.com/role/DisclosureLoansIndividuallyEvaluatedLoansWithAssociatedAllowanceDetails</Role>
      <ShortName>Loans - Individually Evaluated Loans with Associated Allowance (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>55</Position>
    </Report>
    <Report instance="unty-20250930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>99940705 - Disclosure - Loans - Risk by Loan Portfolio (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unitybank.com/role/DisclosureLoansRiskByLoanPortfolioDetails</Role>
      <ShortName>Loans - Risk by Loan Portfolio (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>56</Position>
    </Report>
    <Report instance="unty-20250930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>99940706 - Disclosure - Loans - Modifications (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unitybank.com/role/DisclosureLoansModificationsDetails</Role>
      <ShortName>Loans - Modifications (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>57</Position>
    </Report>
    <Report instance="unty-20250930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>99940801 - Disclosure - Allowance for Credit Losses and Reserve for Unfunded Loan Commitments - Activity in the Allowance for Loan Losses by Portfolio Segment (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unitybank.com/role/DisclosureAllowanceForCreditLossesAndReserveForUnfundedLoanCommitmentsActivityInAllowanceForLoanLossesByPortfolioSegmentDetails</Role>
      <ShortName>Allowance for Credit Losses and Reserve for Unfunded Loan Commitments - Activity in the Allowance for Loan Losses by Portfolio Segment (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>58</Position>
    </Report>
    <Report instance="unty-20250930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>99940802 - Disclosure - Allowance for Credit Losses and Reserve for Unfunded Loan Commitments - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unitybank.com/role/DisclosureAllowanceForCreditLossesAndReserveForUnfundedLoanCommitmentsNarrativeDetails</Role>
      <ShortName>Allowance for Credit Losses and Reserve for Unfunded Loan Commitments - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.unitybank.com/role/DisclosureAllowanceForCreditLossesAndReserveForUnfundedLoanCommitmentsTables</ParentRole>
      <Position>59</Position>
    </Report>
    <Report instance="unty-20250930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>99940901 - Disclosure - Derivative Financial Instruments and Hedging Activities - General Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unitybank.com/role/DisclosureDerivativeFinancialInstrumentsAndHedgingActivitiesGeneralInformationDetails</Role>
      <ShortName>Derivative Financial Instruments and Hedging Activities - General Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>60</Position>
    </Report>
    <Report instance="unty-20250930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>99940902 - Disclosure - Derivative Financial Instruments and Hedging Activities - Gain (Loss) in AOCI (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unitybank.com/role/DisclosureDerivativeFinancialInstrumentsAndHedgingActivitiesGainLossInAociDetails</Role>
      <ShortName>Derivative Financial Instruments and Hedging Activities - Gain (Loss) in AOCI (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.unitybank.com/role/DisclosureDerivativeFinancialInstrumentsAndHedgingActivitiesTables</ParentRole>
      <Position>61</Position>
    </Report>
    <Report instance="unty-20250930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>99941001 - Disclosure - Regulatory Capital (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.unitybank.com/role/DisclosureRegulatoryCapitalDetails</Role>
      <ShortName>Regulatory Capital (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.unitybank.com/role/DisclosureRegulatoryCapitalTables</ParentRole>
      <Position>62</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <InputFiles>
    <File>unty-20250930.xsd</File>
    <File>unty-20250930_cal.xml</File>
    <File>unty-20250930_def.xml</File>
    <File>unty-20250930_lab.xml</File>
    <File>unty-20250930_pre.xml</File>
    <File doctype="10-Q" isDefinitelyFs="true" isUsgaap="true" original="unty-20250930x10q.htm">unty-20250930x10q.htm</File>
  </InputFiles>
  <SupplementalFiles>
    <File>unty-20250930x10q001.jpg</File>
    <File>unty-20250930x10q002.jpg</File>
  </SupplementalFiles>
  <BaseTaxonomies>
    <BaseTaxonomy items="1544">http://fasb.org/us-gaap/2025</BaseTaxonomy>
    <BaseTaxonomy items="29">http://xbrl.sec.gov/dei/2025</BaseTaxonomy>
    <BaseTaxonomy items="4">http://xbrl.sec.gov/ecd/2025</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
