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Other Comprehensive Income (Loss) - Reclassified Out of Each Component of AOCI (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |
Net gain on securities transactions | $ 26,361 | $ 25,917 | $ 80,432 | $ 74,261
Tax expense | (5,427) | (8,491) | (16,939) | (24,127)
Other operating expense | (11,781) | (9,858) | (34,825) | (29,738)
Net of tax | (20,902) | (17,394) | (63,397) | (50,037)
Amount Reclassified from Accumulated Other Comprehensive (Loss) Income | Available-for-sale securities: |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |
Net gain on securities transactions | 30 | 423 | 324 | 423
Tax expense | (7) | (169) | (79) | (169)
Net of tax | (23) | (254) | (245) | (254)
Amount Reclassified from Accumulated Other Comprehensive (Loss) Income | Net retirement plan actuarial (gain) loss |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |
Other operating expense | (430) | (376) | (1,289) | (1,130)
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 | (4) | (3) | (12) | (11)
Amount Reclassified from Accumulated Other Comprehensive (Loss) Income | Employee Benefit Plans |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |
Net gain on securities transactions | (434) | (379) | (1,301) | (1,141)
Tax expense | 106 | 150 | 319 | 455
Net of tax | $ (328) | $ (229) | $ (982) | $ (686)

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