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Other Comprehensive Income (Loss) - Schedule of Amounts Reclassified Out of Each Component (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Net loss on securities transactions $ (6) $ (7,065) $ (20) $ (7,052)
Income tax expense (4,902) (1,784) (10,100) (7,685)
Other operating expense (13,349) (14,468) (26,340) (27,937)
Total before tax 20,615 10,290 42,716 35,603
Net income attributable to Tompkins Financial Corporation 15,682 8,475 32,554 27,856
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 0 (7,052) 0 (7,052)
Income tax expense 0 1,727 0 1,727
Net income attributable to Tompkins Financial Corporation 0 (5,325) 0 (5,325)
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 (215) (261) (457) (558)
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 (47) (54) (92) (109)
Amount Reclassified from Accumulated Other Comprehensive (Loss) Income | Employee benefit plans        
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Income tax expense 65 77 135 164
Total before tax (262) (315) (549) (667)
Net income attributable to Tompkins Financial Corporation $ (197) $ (238) $ (414) $ (503)