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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, 2024
Dec. 31, 2023
Dec. 31, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]      
Net gain (loss) on securities transactions $ 32 $ (69,973) $ (634)
Tax expense (benefit) (22,003) (2,495) (24,557)
Other operating expense (51,199) (56,314) (50,497)
Total before tax 92,976 12,124 109,713
Net Income Attributable to Tompkins Financial Corporation 70,850 9,505 $ 85,030
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 gain (loss) on securities transactions 50 (69,984)  
Tax expense (benefit) (12) 17,146  
Net Income Attributable to Tompkins Financial Corporation 38 (52,838)  
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 operating expense (915) (1,116)  
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 operating expense (182) (217)  
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) 257 327  
Total before tax (1,097) (1,333)  
Net Income Attributable to Tompkins Financial Corporation $ (840) $ (1,006)