<?xml version='1.0' encoding='UTF-8'?>
<FilingSummary>
  <Version>3.8.0.1</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>609</ContextCount>
  <ElementCount>335</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>false</FootnotesReported>
  <SegmentCount>92</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>10</UnitCount>
  <MyReports>
    <Report instance="tmp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>0001000 - Document - Document and Entity Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tompkinsfinancial.com/role/DocumentAndEntityInformation</Role>
      <ShortName>Document and Entity Information</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="tmp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>1001000 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CONDITION</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tompkinsfinancial.com/role/CondensedConsolidatedStatementsOfCondition</Role>
      <ShortName>CONDENSED CONSOLIDATED STATEMENTS OF CONDITION</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="tmp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>1001501 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CONDITION (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tompkinsfinancial.com/role/CondensedConsolidatedStatementsOfConditionParenthetical</Role>
      <ShortName>CONDENSED CONSOLIDATED STATEMENTS OF CONDITION (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="tmp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>1002000 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF INCOME</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tompkinsfinancial.com/role/CondensedConsolidatedStatementsOfIncome</Role>
      <ShortName>CONDENSED CONSOLIDATED STATEMENTS OF INCOME</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="tmp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>1003000 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tompkinsfinancial.com/role/ConsolidatedStatementsOfComprehensiveIncome</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="tmp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>1004000 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tompkinsfinancial.com/role/ConsolidatedStatementsOfCashFlows</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF CASH FLOWS</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="tmp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>1005000 - Statement - CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tompkinsfinancial.com/role/ConsolidatedStatementsOfChangesInShareholdersEquity</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="tmp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>1005501 - Statement - CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tompkinsfinancial.com/role/ConsolidatedStatementsOfChangesInShareholdersEquityParenthetical</Role>
      <ShortName>CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="tmp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>2101100 - Disclosure - Business</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tompkinsfinancial.com/role/Business</Role>
      <ShortName>Business</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="tmp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>2102100 - Disclosure - Basis of Presentation</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tompkinsfinancial.com/role/BasisOfPresentation</Role>
      <ShortName>Basis of Presentation</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="tmp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>2103100 - Disclosure - New Accounting Standards</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tompkinsfinancial.com/role/NewAccountingStandards</Role>
      <ShortName>New Accounting Standards</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="tmp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>2104100 - Disclosure - Securities</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tompkinsfinancial.com/role/Securities</Role>
      <ShortName>Securities</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="tmp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>2105100 - Disclosure - Loans and Leases</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tompkinsfinancial.com/role/LoansAndLeases</Role>
      <ShortName>Loans and Leases</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="tmp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>2106100 - Disclosure - Allowance for Loan and Lease Losses</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tompkinsfinancial.com/role/AllowanceForLoanAndLeaseLosses</Role>
      <ShortName>Allowance for Loan and Lease Losses</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="tmp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>2108100 - Disclosure - Earnings Per Share</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tompkinsfinancial.com/role/EarningsPerShare</Role>
      <ShortName>Earnings Per Share</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="tmp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>2109100 - Disclosure - Other Comprehensive Income (Loss)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tompkinsfinancial.com/role/OtherComprehensiveIncomeLoss</Role>
      <ShortName>Other Comprehensive Income (Loss)</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="tmp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>2110100 - Disclosure - Employee Benefit Plan</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tompkinsfinancial.com/role/EmployeeBenefitPlan</Role>
      <ShortName>Employee Benefit Plan</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="tmp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>2111100 - Disclosure - Other Income and Operating Expense</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tompkinsfinancial.com/role/OtherIncomeAndOperatingExpense</Role>
      <ShortName>Other Income and Operating Expense</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="tmp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>2112100 - Disclosure - Revenue Recognition</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tompkinsfinancial.com/role/RevenueRecognition</Role>
      <ShortName>Revenue Recognition</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="tmp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>2113100 - Disclosure - Financial Guarantees</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tompkinsfinancial.com/role/FinancialGuarantees</Role>
      <ShortName>Financial Guarantees</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="tmp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>2114100 - Disclosure - Segment and Related Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tompkinsfinancial.com/role/SegmentAndRelatedInformation</Role>
      <ShortName>Segment and Related Information</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="tmp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>2115100 - Disclosure - Fair Value</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tompkinsfinancial.com/role/FairValue</Role>
      <ShortName>Fair Value</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="tmp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>2203201 - Disclosure - New Accounting Standards (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tompkinsfinancial.com/role/NewAccountingStandardsPolicies</Role>
      <ShortName>New Accounting Standards (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <ParentRole>http://tompkinsfinancial.com/role/NewAccountingStandards</ParentRole>
      <Position>23</Position>
    </Report>
    <Report instance="tmp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>2304301 - Disclosure - Securities (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tompkinsfinancial.com/role/SecuritiesTables</Role>
      <ShortName>Securities (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://tompkinsfinancial.com/role/Securities</ParentRole>
      <Position>24</Position>
    </Report>
    <Report instance="tmp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>2305301 - Disclosure - Loans and Leases (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tompkinsfinancial.com/role/LoansAndLeasesTables</Role>
      <ShortName>Loans and Leases (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://tompkinsfinancial.com/role/LoansAndLeases</ParentRole>
      <Position>25</Position>
    </Report>
    <Report instance="tmp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>2306301 - Disclosure - Allowance for Loan and Lease Losses (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tompkinsfinancial.com/role/AllowanceForLoanAndLeaseLossesTables</Role>
      <ShortName>Allowance for Loan and Lease Losses (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://tompkinsfinancial.com/role/AllowanceForLoanAndLeaseLosses</ParentRole>
      <Position>26</Position>
    </Report>
    <Report instance="tmp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>2308301 - Disclosure - Earnings Per Share (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tompkinsfinancial.com/role/EarningsPerShareTables</Role>
      <ShortName>Earnings Per Share (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://tompkinsfinancial.com/role/EarningsPerShare</ParentRole>
      <Position>27</Position>
    </Report>
    <Report instance="tmp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>2309301 - Disclosure - Other Comprehensive Income (Loss) (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tompkinsfinancial.com/role/OtherComprehensiveIncomeLossTables</Role>
      <ShortName>Other Comprehensive Income (Loss) (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://tompkinsfinancial.com/role/OtherComprehensiveIncomeLoss</ParentRole>
      <Position>28</Position>
    </Report>
    <Report instance="tmp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>2310301 - Disclosure - Employee Benefit Plan (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tompkinsfinancial.com/role/EmployeeBenefitPlanTables</Role>
      <ShortName>Employee Benefit Plan (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://tompkinsfinancial.com/role/EmployeeBenefitPlan</ParentRole>
      <Position>29</Position>
    </Report>
    <Report instance="tmp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>2311301 - Disclosure - Other Income and Operating Expense (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tompkinsfinancial.com/role/OtherIncomeAndOperatingExpenseTables</Role>
      <ShortName>Other Income and Operating Expense (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://tompkinsfinancial.com/role/OtherIncomeAndOperatingExpense</ParentRole>
      <Position>30</Position>
    </Report>
    <Report instance="tmp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>2312301 - Disclosure - Revenue Recognition (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tompkinsfinancial.com/role/RevenueRecognitionTables</Role>
      <ShortName>Revenue Recognition (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://tompkinsfinancial.com/role/RevenueRecognition</ParentRole>
      <Position>31</Position>
    </Report>
    <Report instance="tmp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>2314301 - Disclosure - Segment and Related Information (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tompkinsfinancial.com/role/SegmentAndRelatedInformationTables</Role>
      <ShortName>Segment and Related Information (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://tompkinsfinancial.com/role/SegmentAndRelatedInformation</ParentRole>
      <Position>32</Position>
    </Report>
    <Report instance="tmp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>2315301 - Disclosure - Fair Value (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tompkinsfinancial.com/role/FairValueTables</Role>
      <ShortName>Fair Value (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://tompkinsfinancial.com/role/FairValue</ParentRole>
      <Position>33</Position>
    </Report>
    <Report instance="tmp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>2401401 - Disclosure - Business (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tompkinsfinancial.com/role/BusinessDetails</Role>
      <ShortName>Business (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://tompkinsfinancial.com/role/Business</ParentRole>
      <Position>34</Position>
    </Report>
    <Report instance="tmp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>2403402 - Disclosure - New Accounting Standards (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tompkinsfinancial.com/role/NewAccountingStandardsDetails</Role>
      <ShortName>New Accounting Standards (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://tompkinsfinancial.com/role/NewAccountingStandardsPolicies</ParentRole>
      <Position>35</Position>
    </Report>
    <Report instance="tmp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>2404402 - Disclosure - Securities - Available-for-Sale Securities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tompkinsfinancial.com/role/SecuritiesAvailableForSaleSecuritiesDetails</Role>
      <ShortName>Securities - Available-for-Sale Securities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>36</Position>
    </Report>
    <Report instance="tmp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>2404403 - Disclosure - Securities - Held-to-Maturities Securities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tompkinsfinancial.com/role/SecuritiesHeldToMaturitiesSecuritiesDetails</Role>
      <ShortName>Securities - Held-to-Maturities Securities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>37</Position>
    </Report>
    <Report instance="tmp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>2404404 - Disclosure - Securities - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tompkinsfinancial.com/role/SecuritiesNarrativeDetails</Role>
      <ShortName>Securities - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>38</Position>
    </Report>
    <Report instance="tmp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>2404405 - Disclosure - Securities - Securities with Unrealized Losses (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tompkinsfinancial.com/role/SecuritiesSecuritiesWithUnrealizedLossesDetails</Role>
      <ShortName>Securities - Securities with Unrealized Losses (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>39</Position>
    </Report>
    <Report instance="tmp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>2404406 - Disclosure - Securities - Contractual Maturity Date of Available-for-Sale Securities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tompkinsfinancial.com/role/SecuritiesContractualMaturityDateOfAvailableForSaleSecuritiesDetails</Role>
      <ShortName>Securities - Contractual Maturity Date of Available-for-Sale Securities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>40</Position>
    </Report>
    <Report instance="tmp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>2404407 - Disclosure - Securities - Contractual Maturity Date of Held-to-Maturity Securities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tompkinsfinancial.com/role/SecuritiesContractualMaturityDateOfHeldToMaturitySecuritiesDetails</Role>
      <ShortName>Securities - Contractual Maturity Date of Held-to-Maturity Securities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>41</Position>
    </Report>
    <Report instance="tmp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>2405402 - Disclosure - Loans and Leases - Schedule of Loans and Leases (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tompkinsfinancial.com/role/LoansAndLeasesScheduleOfLoansAndLeasesDetails</Role>
      <ShortName>Loans and Leases - Schedule of Loans and Leases (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>42</Position>
    </Report>
    <Report instance="tmp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>2405403 - Disclosure - Loans and Leases - Outstanding Principal Balance (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tompkinsfinancial.com/role/LoansAndLeasesOutstandingPrincipalBalanceDetails</Role>
      <ShortName>Loans and Leases - Outstanding Principal Balance (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>43</Position>
    </Report>
    <Report instance="tmp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>2405404 - Disclosure - Loans and Leases - Past Due Loans (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tompkinsfinancial.com/role/LoansAndLeasesPastDueLoansDetails</Role>
      <ShortName>Loans and Leases - Past Due Loans (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>44</Position>
    </Report>
    <Report instance="tmp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>2406402 - Disclosure - Allowance for Loan and Lease Losses - Schedule of Detail in Allowance for Loan and Lease Losses(Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tompkinsfinancial.com/role/AllowanceForLoanAndLeaseLossesScheduleOfDetailInAllowanceForLoanAndLeaseLossesdetails</Role>
      <ShortName>Allowance for Loan and Lease Losses - Schedule of Detail in Allowance for Loan and Lease Losses(Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>45</Position>
    </Report>
    <Report instance="tmp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>2406403 - Disclosure - Allowance for Loan and Lease Losses -  Loans Evaluated for Impairment (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tompkinsfinancial.com/role/AllowanceForLoanAndLeaseLossesLoansEvaluatedForImpairmentDetails</Role>
      <ShortName>Allowance for Loan and Lease Losses -  Loans Evaluated for Impairment (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>46</Position>
    </Report>
    <Report instance="tmp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>2406404 - Disclosure - Allowance for Loan and Lease Losses - Recorded Investment in Loans and Leases (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tompkinsfinancial.com/role/AllowanceForLoanAndLeaseLossesRecordedInvestmentInLoansAndLeasesDetails</Role>
      <ShortName>Allowance for Loan and Lease Losses - Recorded Investment in Loans and Leases (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>47</Position>
    </Report>
    <Report instance="tmp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>2406405 - Disclosure - Allowance for Loan and Lease Losses - Recorded Investment and Related Allowance (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tompkinsfinancial.com/role/AllowanceForLoanAndLeaseLossesRecordedInvestmentAndRelatedAllowanceDetails</Role>
      <ShortName>Allowance for Loan and Lease Losses - Recorded Investment and Related Allowance (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>48</Position>
    </Report>
    <Report instance="tmp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>2406406 - Disclosure - Allowance for Loan and Lease Losses - Average Recorded Investment and Interest Income (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tompkinsfinancial.com/role/AllowanceForLoanAndLeaseLossesAverageRecordedInvestmentAndInterestIncomeDetails</Role>
      <ShortName>Allowance for Loan and Lease Losses - Average Recorded Investment and Interest Income (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>49</Position>
    </Report>
    <Report instance="tmp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>2406407 - Disclosure - Allowance for Loan and Lease Losses - Loans Modified in Troubled Debt Restructuring (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tompkinsfinancial.com/role/AllowanceForLoanAndLeaseLossesLoansModifiedInTroubledDebtRestructuringDetails</Role>
      <ShortName>Allowance for Loan and Lease Losses - Loans Modified in Troubled Debt Restructuring (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>50</Position>
    </Report>
    <Report instance="tmp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>2406408 - Disclosure - Allowance for Loan and Lease Losses - Credit Quality Indicators by Commercial and Industrial Loans (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tompkinsfinancial.com/role/AllowanceForLoanAndLeaseLossesCreditQualityIndicatorsByCommercialAndIndustrialLoansDetails</Role>
      <ShortName>Allowance for Loan and Lease Losses - Credit Quality Indicators by Commercial and Industrial Loans (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>51</Position>
    </Report>
    <Report instance="tmp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>2406409 - Disclosure - Allowance for Loan and Lease Losses - Credit Quality Indicators by Class of Residential Real Estate and Consumer Loans (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tompkinsfinancial.com/role/AllowanceForLoanAndLeaseLossesCreditQualityIndicatorsByClassOfResidentialRealEstateAndConsumerLoansDetails</Role>
      <ShortName>Allowance for Loan and Lease Losses - Credit Quality Indicators by Class of Residential Real Estate and Consumer Loans (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>52</Position>
    </Report>
    <Report instance="tmp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>2408402 - Disclosure - Earnings Per Share (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tompkinsfinancial.com/role/EarningsPerShareDetails</Role>
      <ShortName>Earnings Per Share (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://tompkinsfinancial.com/role/EarningsPerShareTables</ParentRole>
      <Position>53</Position>
    </Report>
    <Report instance="tmp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>2409402 - Disclosure - Other Comprehensive Income (Loss) - Reclassifications Out of AOCI (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tompkinsfinancial.com/role/OtherComprehensiveIncomeLossReclassificationsOutOfAociDetails</Role>
      <ShortName>Other Comprehensive Income (Loss) - Reclassifications Out of AOCI (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://tompkinsfinancial.com/role/OtherComprehensiveIncomeLossTables</ParentRole>
      <Position>54</Position>
    </Report>
    <Report instance="tmp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>2409403 - Disclosure - Other Comprehensive Income (Loss) - Activity in AOCI (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tompkinsfinancial.com/role/OtherComprehensiveIncomeLossActivityInAociDetails</Role>
      <ShortName>Other Comprehensive Income (Loss) - Activity in AOCI (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://tompkinsfinancial.com/role/OtherComprehensiveIncomeLossTables</ParentRole>
      <Position>55</Position>
    </Report>
    <Report instance="tmp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>2409404 - Disclosure - Other Comprehensive Income (Loss) - Reclassified Out of Each Component of AOCI (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tompkinsfinancial.com/role/OtherComprehensiveIncomeLossReclassifiedOutOfEachComponentOfAociDetails</Role>
      <ShortName>Other Comprehensive Income (Loss) - Reclassified Out of Each Component of AOCI (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://tompkinsfinancial.com/role/OtherComprehensiveIncomeLossTables</ParentRole>
      <Position>56</Position>
    </Report>
    <Report instance="tmp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>2410402 - Disclosure - Employee Benefit Plan - Components of Net Periodic Benefit (Income) Cost (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tompkinsfinancial.com/role/EmployeeBenefitPlanComponentsOfNetPeriodicBenefitIncomeCostDetails</Role>
      <ShortName>Employee Benefit Plan - Components of Net Periodic Benefit (Income) Cost (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>57</Position>
    </Report>
    <Report instance="tmp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>2410403 - Disclosure - Employee Benefit Plan - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tompkinsfinancial.com/role/EmployeeBenefitPlanNarrativeDetails</Role>
      <ShortName>Employee Benefit Plan - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>58</Position>
    </Report>
    <Report instance="tmp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>2411402 - Disclosure - Other Income and Operating Expense (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tompkinsfinancial.com/role/OtherIncomeAndOperatingExpenseDetails</Role>
      <ShortName>Other Income and Operating Expense (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://tompkinsfinancial.com/role/OtherIncomeAndOperatingExpenseTables</ParentRole>
      <Position>59</Position>
    </Report>
    <Report instance="tmp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>2412402 - Disclosure - Revenue Recognition - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tompkinsfinancial.com/role/RevenueRecognitionNarrativeDetails</Role>
      <ShortName>Revenue Recognition - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>60</Position>
    </Report>
    <Report instance="tmp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>2412403 - Disclosure - Revenue Recognition - Disaggregation of Noninterest Income (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tompkinsfinancial.com/role/RevenueRecognitionDisaggregationOfNoninterestIncomeDetails</Role>
      <ShortName>Revenue Recognition - Disaggregation of Noninterest Income (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>61</Position>
    </Report>
    <Report instance="tmp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>2413401 - Disclosure - Financial Guarantees (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tompkinsfinancial.com/role/FinancialGuaranteesDetails</Role>
      <ShortName>Financial Guarantees (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://tompkinsfinancial.com/role/FinancialGuarantees</ParentRole>
      <Position>62</Position>
    </Report>
    <Report instance="tmp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>2414402 - Disclosure - Segment and Related Information - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tompkinsfinancial.com/role/SegmentAndRelatedInformationNarrativeDetails</Role>
      <ShortName>Segment and Related Information - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>63</Position>
    </Report>
    <Report instance="tmp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>2414403 - Disclosure - Segment and Related Information - Schedule of Segment Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tompkinsfinancial.com/role/SegmentAndRelatedInformationScheduleOfSegmentInformationDetails</Role>
      <ShortName>Segment and Related Information - Schedule of Segment Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>64</Position>
    </Report>
    <Report instance="tmp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>2415402 - Disclosure - Fair Value - Recurring Fair Value Measurements (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tompkinsfinancial.com/role/FairValueRecurringFairValueMeasurementsDetails</Role>
      <ShortName>Fair Value - Recurring Fair Value Measurements (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>65</Position>
    </Report>
    <Report instance="tmp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>2415403 - Disclosure - Fair Value - Assets Measured at Fair Value (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tompkinsfinancial.com/role/FairValueAssetsMeasuredAtFairValueDetails</Role>
      <ShortName>Fair Value - Assets Measured at Fair Value (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>66</Position>
    </Report>
    <Report instance="tmp-20180331.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>2415404 - Disclosure - Fair Value - Estimated Fair Value of Instruments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://tompkinsfinancial.com/role/FairValueEstimatedFairValueOfInstrumentsDetails</Role>
      <ShortName>Fair Value - Estimated Fair Value of Instruments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>67</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <InputFiles>
    <File>tmp-20180331.xml</File>
    <File>tmp-20180331.xsd</File>
    <File>tmp-20180331_cal.xml</File>
    <File>tmp-20180331_def.xml</File>
    <File>tmp-20180331_lab.xml</File>
    <File>tmp-20180331_pre.xml</File>
  </InputFiles>
  <SupplementalFiles/>
  <BaseTaxonomies>
    <BaseTaxonomy>http://fasb.org/us-gaap/2017-01-31</BaseTaxonomy>
    <BaseTaxonomy>http://xbrl.sec.gov/dei/2014-01-31</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
