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Other Comprehensive Income (Loss) - Reclassified Out of Each Component of AOCI (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]    
Net gain on securities transactions $ 9,895 $ 26,667
Tax expense (1,909) (5,595)
Other operating expense (11,875) (11,505)
Net income attributable to Tompkins Financial Corporation 7,949 21,040
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 429 0
Tax expense (105) 0
Net of tax 324 0
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 (601) (421)
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 (53) (4)
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 (654) (425)
Tax expense 160 104
Net income attributable to Tompkins Financial Corporation $ (494) $ (321)