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Other Comprehensive Income (Loss) - Schedule of Amounts Reclassified Out of Each Component (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Net loss on securities transactions $ (62,967) $ (95) $ (70,019) $ (179)
Tax (expense) benefit 8,304 (6,774) 619 (20,079)
Other operating expense (13,466) (12,237) (41,403) (37,286)
Total before tax (41,627) 28,145 (6,024) 85,655
Net (loss) income attributable to Tompkins Financial Corporation (33,354) 21,340 (5,498) 65,482
Amount Reclassified from Accumulated Other Comprehensive (Loss) Income | Available-for-sale securities        
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Net loss on securities transactions (62,932) (49) (69,984)  
Tax (expense) benefit 15,419 12 17,146 12
Total before tax       (49)
Net (loss) income attributable to Tompkins Financial Corporation (47,513) (37) (52,838) (37)
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 (279) (565) (837) (1,695)
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) (54) (162) (162)
Amount Reclassified from Accumulated Other Comprehensive (Loss) Income | Employee benefit plans        
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Tax (expense) benefit 81 151 245 454
Total before tax (332) (619) (999) (1,857)
Net (loss) income attributable to Tompkins Financial Corporation $ (251) $ (468) $ (754) $ (1,403)