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Accumulated Other Comprehensive Loss - Changes (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Pre-tax Amount |  |  |  |
Balance | $ (225,385) | $ (143,296) | $ (159,423) | $ (145,472)
Other comprehensive income (loss) | (24,263) | 31,473 | (90,225) | 33,649
Balance | (249,648) | (111,823) | (249,648) | (111,823)
Income Tax Benefit (Expense) |  |  |  |
Balance | 60,701 | 56,604 | 63,040 | 57,461
Other comprehensive income (loss) | 6,537 | (12,432) | 24,266 | (13,289)
Balance | 67,238 | 44,172 | 67,238 | 44,172
Net of tax |  |  |  |
Balance |  |  | 2,532,551 | 2,476,485
Other comprehensive (loss) income | (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 (loss) income | (17,726) | 19,041 | (65,959) | 20,360
Balance | (182,410) | (67,651) | (182,410) | (67,651)
Accumulated other comprehensive loss | ASU 2018-02 |  |  |  |
Income Tax Benefit (Expense) |  |  |  |
Adoption of ASU | (20,068) |  | (20,068) |
Accumulated other comprehensive loss | Adjustments for New Accounting Principle, Early Adoption | ASU 2018-02 |  |  |  |
Income Tax Benefit (Expense) |  |  |  |
Adoption of ASU | (20,068) |  | (20,068) |
Investment securities: |  |  |  |
Pre-tax Amount |  |  |  |
Unrealized net (losses) gains arising during the period | (24,688) | 31,215 | (91,388) | 32,793
Other comprehensive income (loss) | (24,688) | 31,215 | (91,388) | 32,793
Income Tax Benefit (Expense) |  |  |  |
Unrealized net gains (losses) arising during the period | 6,649 | (12,330) | 24,572 | (12,951)
Other comprehensive income (loss) | 6,649 | (12,330) | 24,572 | (12,951)
Net of tax |  |  |  |
Balance | (138,334) | (59,001) | (74,117) | (59,958)
Unrealized net gains (losses) arising during the period | (18,039) | 18,885 | (66,816) | 19,842
Other comprehensive (loss) income | (18,039) | 18,885 | (66,816) | 19,842
Balance | (156,373) | (40,116) | (156,373) | (40,116)
Investment securities: | Adjustments for New Accounting Principle, Early Adoption | ASU 2018-02 |  |  |  |
Income Tax Benefit (Expense) |  |  |  |
Adoption of ASU | (15,440) |  | (15,440) |
Cash flow derivative hedges: |  |  |  |
Pre-tax Amount |  |  |  |
Unrealized net (losses) gains arising during the period | 425 | 258 | 1,163 | 856
Other comprehensive income (loss) | 425 | 258 | 1,163 | 856
Income Tax Benefit (Expense) |  |  |  |
Unrealized net gains (losses) arising during the period | (112) | (102) | (306) | (338)
Other comprehensive income (loss) | (112) | (102) | (306) | (338)
Net of tax |  |  |  |
Balance | 4,989 | 2,546 | 3,680 | 2,184
Unrealized net gains (losses) arising during the period | 313 | 156 | 857 | 518
Other comprehensive (loss) income | 313 | 156 | 857 | 518
Balance | 5,302 | $ 2,702 | 5,302 | $ 2,702
Cash flow derivative hedges: | Adjustments for New Accounting Principle, Early Adoption | ASU 2018-02 |  |  |  |
Income Tax Benefit (Expense) |  |  |  |
Adoption of ASU | $ 765 |  | $ 765 |

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