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Other Comprehensive Income (Loss) - Schedule of Amounts Reclassified Out of Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]      
Net (loss) gain on securities transactions $ (69,973) $ (634) $ 249
Tax expense (benefit) (2,495) (24,557) (25,182)
Other Noninterest Expense (56,314) (50,497) (47,253)
Total before tax 12,124 109,713 114,573
Net Income Attributable to Tompkins Financial Corporation 9,505 85,030 $ 89,264
Amount Reclassified from Accumulated Other Comprehensive Income (Loss) | Available-for-sale securities      
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]      
Net (loss) gain on securities transactions (69,984) (11,916)  
Tax expense (benefit) 17,146 2,919  
Net Income Attributable to Tompkins Financial Corporation (52,838) (8,997)  
Amount Reclassified from Accumulated Other Comprehensive Income (Loss) | Net retirement plan actuarial loss      
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]      
Other Noninterest Expense (1,116) (2,260)  
Amount Reclassified from Accumulated Other Comprehensive Income (Loss) | Net retirement plan prior service cost      
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]      
Other Noninterest Expense (217) (216)  
Amount Reclassified from Accumulated Other Comprehensive Income (Loss) | Employee benefit plans      
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]      
Tax expense (benefit) 327 606  
Total before tax (1,333) (2,476)  
Net Income Attributable to Tompkins Financial Corporation $ (1,006) $ (1,870)