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Other Comprehensive Income (Loss) - Reclassified Out of Each Component of AOCI (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]    
Net gain (loss) on securities transactions $ 13 $ (47)
Other operating expense (13,469) (12,020)
Income Before Income Tax Expense 25,313 30,280
Tax expense (benefit) (5,901) (6,976)
Net income attributable to Tompkins Financial Corporation 19,381 23,273
Amount Reclassified from Accumulated Other Comprehensive (Loss) Income | Unrealized gains and losses on available-for-sale debt securities    
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]    
Net gain (loss) on securities transactions 0 0
Tax expense (benefit) 0 0
Net income attributable to Tompkins Financial Corporation 0 0
Amount Reclassified from Accumulated Other Comprehensive (Loss) Income | Net retirement plan actuarial loss    
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]    
Other operating expense (297) (615)
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 (55) (56)
Amount Reclassified from Accumulated Other Comprehensive (Loss) Income | Employee Benefit Plans    
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]    
Income Before Income Tax Expense (352) (671)
Tax expense (benefit) 87 165
Net income attributable to Tompkins Financial Corporation $ (265) $ (506)