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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income attributable to noncontrolling interests and Tompkins Financial Corporation	$ 81,845	$ 82,435	$ 52,622
Available-for-sale securities:
Change in net unrealized gain (loss) during the period	25,241	(10,981)	(2,681)
Unrealized gains on HTM securities transferred to AFS securities	2,852	0	0
Reclassification adjustment for net realized (gain) loss on sale included in available-for-sale securities	(465)	332	244
Employee benefit plans:
Net retirement plan loss	(7,642)	(2,594)	(3,434)
Net actuarial gain due to curtailment	(302)	0	0
Net retirement plan prior service (credit) cost	(1,373)	0	728
Amortization of net retirement plan actuarial gain	1,266	1,298	905
Amortization of net retirement plan prior service cost	24	11	9
Other comprehensive income (loss)	19,601	(11,934)	(4,229)
Subtotal comprehensive income attributable to noncontrolling interests and Tompkins Financial Corporation	101,446	70,501	48,393
Less: Total comprehensive income attributable to noncontrolling interests	(127)	(127)	(128)
Total comprehensive income attributable to Tompkins Financial Corporation	$ 101,319	$ 70,374	$ 48,265

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