CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Common Stock	Additional Paid-in Capital	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	Accumulated Other Comprehensive (Loss) Income	Treasury Stock	Non- controlling Interests
Beginning balances at Dec. 31, 2021	$ 728,941		$ 1,470	$ 312,538	$ 475,262		$ (55,950)	$ (5,791)	$ 1,412
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss) attributable to noncontrolling interests and Tompkins Financial Corporation	85,156				85,030				126
Other comprehensive (loss) income	(152,739)						(152,739)
Total Comprehensive Loss	(67,583)
Cash dividends	(33,565)				(33,565)
Net exercise of stock options	(538)		1	(539)
Common stock repurchased and returned to unissued status	(15,430)		(20)	(15,410)
Stock-based compensation expense	4,343			4,343
Shares issued for employee stock ownership plan	2,951		4	2,947
Directors deferred compensation plan	0			488				(488)
Restricted stock activity	(1,758)		1	(1,759)
Adjustment to goodwill	155			155
Dividend to noncontrolling interests	(126)								(126)
Ending balances at Dec. 31, 2022	617,390		1,456	302,763	526,727		(208,689)	(6,279)	1,412
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss) attributable to noncontrolling interests and Tompkins Financial Corporation	9,629				9,505				124
Other comprehensive (loss) income	83,684						83,684
Total Comprehensive Loss	93,313
Cash dividends	(34,657)				(34,657)
Net exercise of stock options	(124)			(124)
Common stock repurchased and returned to unissued status	(8,726)		(15)	(8,711)
Stock-based compensation expense	4,100			4,100
Directors deferred compensation plan	0			331				(331)
Restricted stock activity	(1,173)		3	(1,176)
Dividend to noncontrolling interests	(124)								(124)
Ending balances at Dec. 31, 2023	$ 669,934		1,444	297,183	501,510		(125,005)	(6,610)	1,412
Ending balances (Accounting Standards Update 2022-02) at Dec. 31, 2023		$ (65)				$ (65)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible Enumeration]	Accounting Standards Update 2022-02
Net income (loss) attributable to noncontrolling interests and Tompkins Financial Corporation	$ 70,973				70,850				123
Other comprehensive (loss) income	6,513						6,513
Total Comprehensive Loss	77,486
Cash dividends	(35,132)				(35,132)
Net exercise of stock options	(115)			(115)
Treasury stock issued	225			170				55
Stock-based compensation expense	3,894			3,894
Directors deferred compensation plan	0			186				(186)
Restricted stock activity	(1,242)		3	(1,245)
Repurchase of noncontrolling interests	(1,412)								(1,412)
Dividend to noncontrolling interests	(123)								(123)
Ending balances at Dec. 31, 2024	$ 713,444		$ 1,447	$ 300,073	$ 537,157		$ (118,492)	$ (6,741)	$ 0
Ending balances (Accounting Standards Update 2022-02) at Dec. 31, 2024		$ (71)				$ (71)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible Enumeration]	Accounting Standards Update 2023-02