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Other Comprehensive Income (Loss) - Reclassified Out of Each Component of AOCI (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]    
Net (loss) gain on securities transactions $ (14) $ 13
Tax expense (5,198) (5,901)
Other operating expense (12,991) (13,469)
Total before tax 22,101 25,313
Net Income Attributable to Tompkins Financial Corporation 16,872 19,381
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 (loss) gain on securities transactions 0 0
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 (242) (297)
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 (45) (55)
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 70 87
Total before tax (287) (352)
Net Income Attributable to Tompkins Financial Corporation $ (217) $ (265)