CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income attributable to noncontrolling interests and Tompkins Financial Corporation	$ 21,463	$ 19,424	$ 29,449	$ 40,496
Available-for-sale debt securities:
Change in net unrealized gain/(loss) during the period	(257)	10,676	21,866	22,570
Reclassification adjustment for net realized gain on sale of available-for-sale debt securities included in net income	0	(204)	(324)	(204)
Employee benefit plans:
Amortization of net retirement plan actuarial loss	439	302	893	620
Amortization of net retirement plan prior service cost	41	2	81	5
Other comprehensive income	223	10,776	22,516	22,991
Subtotal comprehensive income attributable to noncontrolling interests and Tompkins Financial Corporation	21,686	30,200	51,965	63,487
Less: Net income attributable to noncontrolling interests	(32)	(32)	(69)	(64)
Total comprehensive income attributable to Tompkins Financial Corporation	$ 21,654	$ 30,168	$ 51,896	$ 63,423