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Other Comprehensive Income (Loss) - Details about Accumulated Other Comprehensive Income (Loss) Components (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Other operating expense                 $ (46,249) $ (50,921) $ (45,525)
Net (loss) gain on securities transactions $ 26,312 $ 25,715 $ 24,167 $ 26,667 $ 23,808 $ 26,361 $ 27,842 $ 26,229 102,861 104,240 95,242
Tax expense                 (21,016) (21,805) (42,620)
Net Income Attributable to Tompkins Financial Corporation $ 21,080 $ 20,206 $ 19,392 $ 21,040 $ 18,911 $ 20,902 $ 22,059 $ 20,436 81,718 82,308 $ 52,494
Amount Reclassified from Accumulated Other Comprehensive Income (Loss) | Unrealized gains and losses on available-for-sale securities                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Net (loss) gain on securities transactions                 616 (440)  
Tax expense                 (151) 108  
Net Income Attributable to Tompkins Financial Corporation                 465 (332)  
Amount Reclassified from Accumulated Other Comprehensive Income (Loss) | Employee benefit plans                      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Net (loss) gain on securities transactions                 (1,709) (1,734)  
Tax expense                 419 425  
Net Income Attributable to Tompkins Financial Corporation                 (1,290) (1,309)  
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                 (1,677) (1,719)  
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                 $ (32) $ (15)