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Other Comprehensive Income (Loss) - Details about Accumulated Other Comprehensive Income (Loss) Components (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Net (loss) gain on securities transactions $ (634) $ 249 $ 443
Other operating expense (50,497) (47,253) (44,729)
Income Before Income Tax Expense 109,713 114,573 97,666
Tax expense (benefit) (24,557) (25,182) (19,924)
Net Income Attributable to Tompkins Financial Corporation 85,030 89,264 $ 77,588
Amount Reclassified from Accumulated Other Comprehensive Income (Loss) | Unrealized gains and losses on available-for-sale debt securities      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Net (loss) gain on securities transactions (11,916) 275  
Tax expense (benefit) 2,919 (67)  
Net Income Attributable to Tompkins Financial Corporation (8,997) 208  
Amount Reclassified from Accumulated Other Comprehensive Income (Loss) | Net retirement plan actuarial gain      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Other operating expense (2,260) (2,951)  
Amount Reclassified from Accumulated Other Comprehensive Income (Loss) | Net retirement plan prior service credit      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Other operating expense (216) (221)  
Amount Reclassified from Accumulated Other Comprehensive Income (Loss) | Employee benefit plans      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Income Before Income Tax Expense (2,476) (3,172)  
Tax expense (benefit) 606 777  
Net Income Attributable to Tompkins Financial Corporation $ (1,870) $ (2,395)