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Accumulated Other Comprehensive Loss - Changes, Net of Tax (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Net of tax |  |  |  |
Balance |  |  | $ 2,532,551 | $ 2,476,485
Other comprehensive income (loss) | $ (17,726) | $ 19,041 | (65,959) | 20,360
Balance | 2,459,175 | 2,552,602 | 2,459,175 | 2,552,602
Accumulated other comprehensive loss |  |  |  |
Net of tax |  |  |  |
Balance | (164,684) | (86,692) | (96,383) | (88,011)
Other comprehensive income (loss) | (17,726) | 19,041 | (65,959) | 20,360
Balance | (182,410) | (67,651) | (182,410) | (67,651)
Accumulated other comprehensive loss | ASU 2018-02 |  |  |  |
Net of tax |  |  |  |
Adoption of ASU | (20,068) |  | (20,068) |
Accumulated other comprehensive loss | ASU 2018-02 | Adjustments for New Accounting Principle, Early Adoption |  |  |  |
Net of tax |  |  |  |
Adoption of ASU | (20,068) |  | (20,068) |
Pension and other benefits: |  |  |  |
Net of tax |  |  |  |
Balance | (31,339) | (30,237) | (25,946) | (30,237)
Balance | (31,339) | (30,237) | (31,339) | (30,237)
Pension and other benefits: | ASU 2018-02 | Adjustments for New Accounting Principle, Early Adoption |  |  |  |
Net of tax |  |  |  |
Adoption of ASU | (5,393) |  | (5,393) |
Investment securities: |  |  |  |
Net of tax |  |  |  |
Balance | (138,334) | (59,001) | (74,117) | (59,958)
Other comprehensive income (loss) | (18,039) | 18,885 | (66,816) | 19,842
Balance | (156,373) | (40,116) | (156,373) | (40,116)
Investment securities: | ASU 2018-02 | Adjustments for New Accounting Principle, Early Adoption |  |  |  |
Net of tax |  |  |  |
Adoption of ASU | (15,440) |  | (15,440) |
Cash flow derivative hedges: |  |  |  |
Net of tax |  |  |  |
Balance | 4,989 | 2,546 | 3,680 | 2,184
Other comprehensive income (loss) | 313 | 156 | 857 | 518
Balance | 5,302 | $ 2,702 | 5,302 | $ 2,702
Cash flow derivative hedges: | ASU 2018-02 | Adjustments for New Accounting Principle, Early Adoption |  |  |  |
Net of tax |  |  |  |
Adoption of ASU | $ 765 |  | $ 765 |

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