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Other Comprehensive Income (Loss) - Reclassified Out of Each Component of AOCI (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]    
Net gain on securities transactions $ 32,339 $ 9,895
Tax expense (6,680) (1,909)
Other operating expense (11,305) (11,875)
Net income attributable to Tompkins Financial Corporation 25,626 7,949
Amount Reclassified from Accumulated Other Comprehensive (Loss) Income | Available-for-sale debt securities:    
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]    
Net gain on securities transactions 329 429
Tax expense (80) (105)
Net of tax 249 324
Amount Reclassified from Accumulated Other Comprehensive (Loss) Income | Net retirement plan actuarial (gain) loss    
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]    
Other operating expense (764) (601)
Amount Reclassified from Accumulated Other Comprehensive (Loss) Income | Net retirement plan prior service cost    
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]    
Other operating expense (56) (53)
Amount Reclassified from Accumulated Other Comprehensive (Loss) Income | Employee Benefit Plans    
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]    
Net gain on securities transactions (820) (654)
Tax expense 201 160
Net income attributable to Tompkins Financial Corporation $ (619) $ (494)