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Other Comprehensive Income (Loss) - Reclassified Out of Each Component of AOCI (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]    
Net gain (loss) on securities transactions $ 14 $ (14)
Income tax expense (6,121) (5,198)
Other operating expense (13,089) (12,991)
Total before tax 25,800 22,101
Net Income Attributable to Tompkins Financial Corporation 19,679 16,872
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
Income tax expense 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 (171) (242)
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 (49) (45)
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 55 70
Total before tax (220) (287)
Net Income Attributable to Tompkins Financial Corporation $ (165) $ (217)