CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Statement of Comprehensive Income [Abstract]
Net (loss) income attributable to noncontrolling interests and Tompkins Financial Corporation	$ (33,323)	$ 21,371	$ (5,405)	$ 65,576
Available-for-sale debt securities:
Change in net unrealized loss during the period	(28,273)	(64,873)	(20,932)	(188,727)
Reclassification adjustment for net realized loss on sale of available-for-sale debt securities included in net income	47,513	37	52,838	37
Employee benefit plans:
Amortization of net retirement plan actuarial loss	211	427	632	1,280
Amortization of net retirement plan prior service cost	40	41	122	123
Other comprehensive income (loss)	19,491	(64,368)	32,660	(187,287)
Subtotal comprehensive income (loss) attributable to noncontrolling interests and Tompkins Financial Corporation	(13,832)	(42,997)	27,255	(121,711)
Less: Net income (loss) attributable to noncontrolling interests	(31)	(31)	(93)	(94)
Total comprehensive income (loss) attributable to Tompkins Financial Corporation	$ (13,863)	$ (43,028)	$ 27,162	$ (121,805)