CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Adjustment due to the adoption of ASU 2022-02	Common Stock	Additional Paid-in Capital	Retained Earnings	Retained Earnings Adjustment due to the adoption of ASU 2022-02	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	65,576				65,482				94
Other comprehensive income (loss)	(187,287)						(187,287)
Subtotal comprehensive income (loss) attributable to noncontrolling interests and Tompkins Financial Corporation	(121,711)
Cash dividends	(24,874)				(24,874)
Net exercise of stock options	(55)			(55)
Common stock repurchased and returned to unissued status	(15,430)		(20)	(15,410)
Stock-based compensation expense	3,062			3,062
Shares issued for employee stock ownership plan	2,951		4	2,947
Directors deferred compensation plan	0			272				(272)
Restricted stock activity	(80)		(2)	(78)
Adjustment to goodwill	155			155
Ending balances at Sep. 30, 2022	572,959		1,452	303,431	515,870		(243,237)	(6,063)	1,506
Beginning balances at Dec. 31, 2021	728,941		1,470	312,538	475,262		(55,950)	(5,791)	1,412
Ending balances at Dec. 31, 2022	$ 617,390	$ (65)	1,456	302,763	526,727	$ (65)	(208,689)	(6,279)	1,412
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible Enumeration]	Accounting Standards Update 2022-02 [Member]
Beginning balances at Jun. 30, 2022	$ 624,318		1,454	303,335	502,770		(178,869)	(5,847)	1,475
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss) attributable to noncontrolling interests and Tompkins Financial Corporation	21,371				21,340				31
Other comprehensive income (loss)	(64,368)						(64,368)
Subtotal comprehensive income (loss) attributable to noncontrolling interests and Tompkins Financial Corporation	(42,997)
Cash dividends	(8,240)				(8,240)
Net exercise of stock options	(13)			(13)
Common stock repurchased and returned to unissued status	(1,302)		(2)	(1,300)
Stock-based compensation expense	1,089			1,089
Directors deferred compensation plan	0			216				(216)
Restricted stock activity	(51)			(51)
Adjustment to goodwill	155			155
Ending balances at Sep. 30, 2022	572,959		1,452	303,431	515,870		(243,237)	(6,063)	1,506
Beginning balances at Dec. 31, 2022	617,390	$ (65)	1,456	302,763	526,727	$ (65)	(208,689)	(6,279)	1,412
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss) attributable to noncontrolling interests and Tompkins Financial Corporation	(5,405)				(5,498)				93
Other comprehensive income (loss)	32,660						32,660
Subtotal comprehensive income (loss) attributable to noncontrolling interests and Tompkins Financial Corporation	27,255
Cash dividends	(26,041)				(26,041)
Net exercise of stock options	(118)			(118)
Common stock repurchased and returned to unissued status	(8,703)		(15)	(8,688)
Stock-based compensation expense	2,945			2,945
Directors deferred compensation plan	0			124				(124)
Restricted stock activity	(307)		(2)	(305)
Ending balances at Sep. 30, 2023	612,356		1,439	296,721	495,123		(176,029)	(6,403)	1,505
Beginning balances at Jun. 30, 2023	636,441		1,444	298,133	537,095		(195,520)	(6,185)	1,474
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss) attributable to noncontrolling interests and Tompkins Financial Corporation	(33,323)				(33,354)				31
Other comprehensive income (loss)	19,491						19,491
Subtotal comprehensive income (loss) attributable to noncontrolling interests and Tompkins Financial Corporation	(13,832)
Cash dividends	(8,618)				(8,618)
Common stock repurchased and returned to unissued status	(2,325)		(4)	(2,321)
Stock-based compensation expense	790			790
Directors deferred compensation plan	0			218				(218)
Restricted stock activity	(100)		(1)	(99)
Ending balances at Sep. 30, 2023	$ 612,356		$ 1,439	$ 296,721	$ 495,123		$ (176,029)	$ (6,403)	$ 1,505