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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, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net (loss) gain on securities transactions | $ 23,808 | $ 26,361 | $ 27,842 | $ 26,229 | $ 20,981 | $ 25,917 | $ 25,207 | $ 23,137 | $ 104,240 | $ 95,242 | $ 86,516
Tax benefit |  |  |  |  |  |  |  |  | (21,805) | (42,620) | (27,045)
Other operating expense |  |  |  |  |  |  |  |  | (48,303) | (42,998) | (37,234)
Net income attributable to Tompkins Financial Corporation | $ 18,911 | $ 20,902 | $ 22,059 | $ 20,436 | $ 2,457 | $ 17,394 | $ 16,926 | $ 15,717 | 82,308 | 52,494 | $ 59,340
Amount Reclassified from Accumulated Other Comprehensive Income | 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 |  |  |  |  |  |  |  |  | (440) | (407) |
Tax benefit |  |  |  |  |  |  |  |  | 108 | 163 |
Net of tax |  |  |  |  |  |  |  |  | (332) | (244) |
Amount Reclassified from Accumulated Other Comprehensive Income | Net retirement plan actuarial gain |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other operating expense |  |  |  |  |  |  |  |  | (1,719) | (1,508) |
Amount Reclassified from Accumulated Other Comprehensive Income | Net retirement plan prior service credit |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other operating expense |  |  |  |  |  |  |  |  | (15) | (15) |
Amount Reclassified from Accumulated Other Comprehensive Income | Employee Benefit Plans |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net (loss) gain on securities transactions |  |  |  |  |  |  |  |  | (1,734) | (1,523) |
Tax benefit |  |  |  |  |  |  |  |  | 425 | 609 |
Net income attributable to Tompkins Financial Corporation |  |  |  |  |  |  |  |  | $ (1,309) | $ (914) |

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