Other Comprehensive Income (Loss) - Details about Accumulated Other Comprehensive Income (Loss) Components (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net gain on securities transactions	$ 249	$ 443	$ 645
Other operating expense	(47,253)	(44,729)	(46,249)
Income Before Income Tax Expense	114,573	97,666	102,861
Tax expense (benefit)	(25,182)	(19,924)	(21,016)
Net Income Attributable to Tompkins Financial Corporation	89,264	77,588	$ 81,718
Amount Reclassified from Accumulated Other Comprehensive Income (Loss) | Unrealized gains and losses on available-for-sale debt securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net gain on securities transactions	275	430
Tax expense (benefit)	(67)	(106)
Net Income Attributable to Tompkins Financial Corporation	208	324
Amount Reclassified from Accumulated Other Comprehensive Income (Loss) | Net retirement plan actuarial gain
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other operating expense	(2,951)	(2,366)
Amount Reclassified from Accumulated Other Comprehensive Income (Loss) | Net retirement plan prior service credit
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other operating expense	(221)	(214)
Amount Reclassified from Accumulated Other Comprehensive Income (Loss) | Employee benefit plans
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income Before Income Tax Expense	(3,172)	(2,580)
Tax expense (benefit)	777	632
Net Income Attributable to Tompkins Financial Corporation	$ (2,395)	$ (1,948)