Entity tax identification number Entity Tax Identification Number Rollover EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Rollover Maximum Maximum [Member] Legal Entity [Axis] Legal Entity [Axis] Statistical Measurement [Domain] Statistical Measurement [Domain] EBP, Description of Plan [Table] EBP, Description of Plan [Table] Mutual funds Mutual Fund [Member] EBP, Related Party and Party-in-Interest Transactions [Table] EBP, Related Party and Party-in-Interest Transactions [Table] Participant contribution, maximum annual compensation percentage EBP, Participant Contribution, Pretax, Maximum Annual Compensation to Total Compensation, Percentage TOTAL DEDUCTIONS EBP, Change in Net Asset Available for Benefit, Decrease Note receivable from participant, primary residence maximum borrowing term EBP, Note Receivable From Participant, Account, Primary Residence, Borrowing Term EBP, Note Receivable From Participant, Account, Primary Residence, Borrowing Term Note receivable from participant, maximum borrowing amount EBP, Note Receivable from Participant, Account, Maximum Borrowing, Amount FAIR VALUE MEASUREMENTS EBP, Investment, Fair Value and NAV [Text Block] Note receivable from participant, minimum borrowing amount EBP, Note Receivable from Participant, Account, Minimum Borrowing, Amount TOTAL INVESTMENTS EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value Level 1 Fair Value, Inputs, Level 1 [Member] EBP, Investment, Fair Value and NAV [Abstract] ASSETS EBP, Asset [Abstract] Statistical Measurement [Axis] Statistical Measurement [Axis] EBP, Employer Contribution, Second Match EBP, Employer Contribution, Second Match [Member] EBP, Employer Contribution, Second Match Additions to net assets attributed to: EBP, Change in Net Asset Available for Benefit, Increase [Abstract] EBP, Statement of Change in Net Asset Available for Benefit [Table] EBP, Statement of Change in Net Asset Available for Benefit [Table] Note receivable from participant, basis spread on variable rate EBP, Participant Loan, Basis Spread On Variable Rate EBP, Participant Loan, Basis Spread On Variable Rate Payment of benefits EBP, Payment to Participant [Policy Text Block] Amendment Flag Amendment Flag Contribution vesting percentage EBP, Employer Contribution Vesting Percentage Company contribution and/ or investment earning percentage vesting to the participant in Company Matching Contributions, Fixed Rate Contributions, Discretionary Profit-Sharing Contributions, Qualified Non-Elective Contributions, and Disability Contributions, upon completion of minimum service period or attainment of maximum vesting age Basis of accounting EBP, Basis of Accounting [Policy Text Block] EBP, Schedule of Asset Held for Investment [Table] EBP, Schedule of Asset Held for Investment [Table] Requisite service period EBP, Requisite Service Period EBP, Requisite Service Period Investment, number of shares EBP, Investment, Number of Shares EBP, Description of Plan and Accounting Change [Abstract] Receivables: EBP, Receivable [Abstract] Schedule of plan assets at fair value EBP, Investment, Fair Value and NAV [Table Text Block] Contribution vesting service period EBP, Employer Contribution Vesting Service Period Minimum Vesting service period for company contribution and/ or investment earning to the participant in Company Matching Contributions, Fixed Rate Contributions, Discretionary Profit-Sharing Contributions, Qualified Non-Elective Contributions, and Disability Contributions. Investments [Domain] Investments [Domain] Use of estimates EBP, Use of Estimate [Policy Text Block] SCHEDULE H - PART IV ITEM 4i - SCHEDULE OF ASSETS HELD FOR INVESTMENT PURPOSES AT END OF YEAR EBP, Schedule of Asset Held for Investment [Text Block] Cover [Abstract] RISKS AND UNCERTAINTIES EBP, Risk and Uncertainty [Text Block] Minimum Minimum [Member] Transfer from Tompkins Financial Corporation Employee Stock Ownership Plan EBP, Change in Net Asset Available for Benefit, Transfer to (from) Fund within ESOP Interest income on notes receivable from participants EBP, Change in Net Asset Available for Benefit, Increase from Interest Income on Note Receivable from Participant Investment Type [Axis] Investment Type [Axis] Total contributions EBP, Change in Net Asset Available for Benefit, Increase from Contribution Participant EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Excluding Rollover Net appreciation in fair value of investments EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Gain (Loss) on Investment Interest and dividends EBP, Change in Net Asset Available for Benefit, Increase from Interest and Dividend Income on Investment EBP, Description of Plan [Line Items] EBP, Description of Plan [Line Items] EBP, Employer Contribution, First Match EBP, Employer Contribution, First Match [Member] EBP, Employer Contribution, First Match Plan number EBP, Plan Number EBP, Employer Matching Contribution [Domain] EBP, Employer Matching Contribution [Domain] EBP, Employer Matching Contribution [Domain] EBP, Employer Matching Contribution [Axis] EBP, Employer Matching Contribution [Axis] EBP, Employer Matching Contribution EBP, Investment, Fair Value and NAV [Line Items] EBP, Investment, Fair Value and NAV [Line Items] DESCRIPTION OF PLAN EBP, Description of Plan [Text Block] EBP, Statement of Change in Net Asset Available for Benefit [Line Items] EBP, Statement of Change in Net Asset Available for Benefit [Line Items] EBP, Statement of Net Asset Available for Benefit [Table] EBP, Statement of Net Asset Available for Benefit [Table] EBP, Schedule of Asset Held for Investment [Line Items] EBP, Schedule of Asset Held for Investment [Line Items] Tompkins Financial Corporation common stock EBP, Employer, Common Stock [Member] EBP, Schedule of Asset Held for Investment [Abstract] EBP, Accounting Policy [Table] EBP, Accounting Policy [Table] Employer contribution, discretionary percentage EBP, Employer Contribution, Discretionary Percentage EBP, Employer Contribution, Discretionary Percentage TOTAL ADDITIONS EBP, Change in Net Asset Available for Benefit, Increase Investment income: EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Income (Loss) on Investment [Abstract] Investment, Identifier [Axis] Investment, Identifier [Axis] Catch-up contribution age EBP, Catch-Up Age EBP, Catch-Up Age Administrative expenses EBP, Change in Net Asset Available for Benefit, Decrease from Administrative Expense Assets Held for Investment EBP, Asset Held for Investment Document Information [Line Items] Document Information [Line Items] EBP, Risk and Uncertainty [Line Items] EBP, Risk and Uncertainty [Line Items] EBP, Risk and Uncertainty [Table] EBP, Risk and Uncertainty [Table] Employer contribution, participant compensation matched percentage EBP, Employer Contribution, Participant Compensation Matched, Percentage EBP, Statement of Change in Net Asset Available for Benefit [Abstract] Age requirement (year) EBP, Requisite Age Requirement EBP, Requisite Age Requirement Percent of net assets invested in the employer common stock EBP, Investment, Employer, Common Stock, to Total Asset, Percentage Employer EBP, Change in Net Asset Available for Benefit, Increase from Employer Contribution, Cash and Noncash EBP, Tax Status [Table] EBP, Tax Status [Table] NET INCREASE EBP, Change in Net Asset Available for Benefit, Increase (Decrease) TRANSACTIONS WITH PARTIES-IN-INTEREST EBP, Related Party and Party-in-Interest Transactions [Text Block] EBP, Related Party and Party-in-Interest Transactions [Abstract] EBP, Accounting Policy, Accounting Standard Update, and Change in Accounting Principle [Abstract] TOTAL RECEIVABLES EBP, Receivable Employer contributions EBP, Employer Contribution, Receivable Participant contribution, automatic deferral rate EBP, Participant Contribution, Automatic, Deferral Rate Investments, at fair value: EBP, Investment, Fair Value [Abstract] Benefits paid to participants EBP, Change in Net Asset Available for Benefit, Decrease from Payment to Participant Current Value EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] EBP, Statement of Net Asset Available for Benefit [Abstract] EBP, Accounting Policy [Line Items] EBP, Accounting Policy [Line Items] EBP, Tax Status [Abstract] Participant contribution, annual increase in deferral rate EBP, Participant Contribution, Automatic, Annual Increase Deferral Rate Annual increase in percentage of eligible compensation contributed for participant automatically enrolled in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) until the contribution reaches maximum threshold. Administrative expenses EBP, Expense [Policy Text Block] Participant loans EBP, Asset Held for Investment, Participant Loan, after Deemed Distribution Investment valuation and income recognition EBP, Investment [Policy Text Block] Participant contributions EBP, Participant Contribution, Receivable EBP 002 EBP 002 [Member] EBP 002 Document Type Document Type PLAN TERMINATION EBP, Plan Termination [Text Block] Entity Central Index Key Entity Central Index Key Participate loan, interest rate EBP, Asset Held for Investment, Participant Loan, Interest Rate Collective investment trusts Collective investment trusts at NAV Common Collective Trust [Member] EBP, Risk and Uncertainty [Abstract] EBP, Tax Status [Line Items] EBP, Tax Status [Line Items] Deductions from net assets attributed to: EBP, Change in Net Asset Available for Benefit, Decrease [Abstract] Forfeited nonvested account, decrease from employer contribution EBP, Forfeited Nonvested Account, Decrease from Employer Contribution Notes receivable from participants EBP, Note Receivable from Participant Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES EBP, Summary of Accounting Policy [Text Block] Entity Registrant Name Entity Registrant Name Subsequent events EBP, Subsequent Event [Policy Text Block] TAX STATUS EBP, Tax Status [Text Block] Note receivable from participant, maximum borrowing percentage EBP, Note Receivable from Participant, Account, Maximum Borrowing, to Total Account, Percentage Document Information [Table] Document Information [Table] Notes receivable from participants EBP, Note Receivable from Participant [Policy Text Block] Total investment income EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Income (Loss) on Investment Note receivable from participant, general loan maximum borrowing term EBP, Note Receivable From Participant, General Loan, Borrowing Term EBP, Note Receivable From Participant, General Loan, Borrowing Term Additional catch-up contribution age EBP, Catch-Up Age, Additional Contributions EBP, Catch-Up Age, Additional Contributions EBP, Related Party and Party-in-Interest Transactions [Line Items] EBP, Related Party and Party-in-Interest Transactions [Line Items] NET ASSETS AVAILABLE FOR BENEFITS Net assets available for benefits at beginning of year Net assets available for benefits at end of year EBP, Net Asset Available for Benefit Entity [Domain] Entity [Domain] Contributions: EBP, Change in Net Asset Available for Benefit, Increase from Contribution [Abstract] Forfeited nonvested account EBP, Forfeited Nonvested Account Employer contribution, matching percentage EBP, Employer Contribution, Matching Percentage Employer contribution, discretionary employee classifications EBP, Employer Contribution, Discretionary Employee Classifications EBP, Employer Contribution, Discretionary Employee Classifications EBP, Investment, Fair Value and NAV [Table] EBP, Investment, Fair Value and NAV [Table] EBP, Statement of Net Asset Available for Benefit [Line Items] EBP, Statement of Net Asset Available for Benefit [Line Items]