Cover Page - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Feb. 28, 2022	Jun. 30, 2021
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2021
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	1-12709
Entity Registrant Name	Tompkins Financial Corp
Entity Incorporation, State or Country Code	NY
Entity Tax Identification Number	16-1482357
Entity Address, Address Line One	118 E. Seneca Street
Entity Address, Address Line Two	P.O. Box 460
Entity Address, City or Town	Ithaca
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	14851
City Area Code	888
Local Phone Number	503-5753
Title of 12(b) Security	Common Stock ($.10 Par Value Per Share)
Trading Symbol	TMP
Security Exchange Name	NYSEAMER
Entity a Well-known Seasoned Issuer	No
Entity a Voluntary Filer	No
Entity's Reporting Status Current	No
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Emerging Growth Company	false
Auditor Attestation Flag	true
Entity Shell Company	false
Entity Public Float			$ 931.7
Entity Common Stock, Shares Outstanding		14,584,596
Documents Incorporated by Reference	Portions of the registrant’s definitive Proxy Statement relating to its 2022 Annual Meeting of stockholders, to be held on May 10, 2022, are incorporated by reference into Part III of this Form 10-K where indicated.
Entity Central Index Key	0001005817
Amendment Flag	false
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2021