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Accumulated Other Comprehensive Loss - Changes (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Pre-tax Amount |  |  |  |
Other comprehensive income (loss) | $ 18,079 | $ (30,504) | $ 155,222 | $ (120,729)
Income Tax Benefit (Expense) |  |  |  |
Other comprehensive income (loss) | (4,869) | 8,215 | (41,801) | 32,481
Net of tax |  |  |  |
Balance, beginning | 2,659,441 | 2,459,175 | 2,524,839 | 2,532,551
Other comprehensive income (loss) | 13,210 | (22,289) | 113,421 | (88,248)
Balance, ending | 2,654,558 | 2,423,462 | 2,654,558 | 2,423,462
Early Adoption | ASU 2018-02 |  |  |  |
Income Tax Benefit (Expense) |  |  |  |
Early adoption of ASU No. 2018-02 |  |  |  | (20,068)
Net of tax |  |  |  |
Other comprehensive income (loss) |  |  |  | (20,068)
Accumulated other comprehensive Income (loss) |  |  |  |
Pre-tax Amount |  |  |  |
Balance | (43,772) | (249,648) | (180,915) | (159,423)
Balance | (25,693) | (280,152) | (25,693) | (280,152)
Income Tax Benefit (Expense) |  |  |  |
Balance | 11,788 | 67,238 | 48,720 | 63,040
Balance | 6,919 | 75,453 | 6,919 | 75,453
Net of tax |  |  |  |
Balance, beginning | (31,984) | (182,410) | (132,195) | (96,383)
Other comprehensive income (loss) | 13,210 | (22,289) | 113,421 | (88,248)
Balance, ending | (18,774) | (204,699) | (18,774) | (204,699)
Accumulated other comprehensive Income (loss) | Early Adoption | ASU 2018-02 |  |  |  |
Net of tax |  |  |  |
Other comprehensive income (loss) |  |  |  | (20,068)
Pension and other benefits, net actuarial losses arising during the year |  |  |  |
Pre-tax Amount |  |  |  |
Other comprehensive income (loss) |  |  | (813) |
Income Tax Benefit (Expense) |  |  |  |
Other comprehensive income (loss) |  |  | 219 |
Net of tax |  |  |  |
Other comprehensive income (loss) |  |  | (594) |
Pension and other benefits, net change in pension and other benefits |  |  |  |
Pre-tax Amount |  |  |  |
Other comprehensive income (loss) |  |  | (813) |
Income Tax Benefit (Expense) |  |  |  |
Other comprehensive income (loss) |  |  | 219 |
Net of tax |  |  |  |
Balance, beginning | (28,973) | (31,339) | (28,379) | (25,946)
Other comprehensive income (loss) |  |  | (594) |
Balance, ending | (28,973) | (31,339) | (28,973) | (31,339)
Pension and other benefits, net change in pension and other benefits | Early Adoption | ASU 2018-02 |  |  |  |
Net of tax |  |  |  |
Other comprehensive income (loss) |  |  |  | (5,393)
Investment securities: |  |  |  |
Pre-tax Amount |  |  |  |
Unrealized net (losses) gains arising during the period | 18,079 | (30,682) | 153,443 | (122,070)
Reclassification of net losses (gains) to net income |  |  | 2,592 |
Other comprehensive income (loss) | 18,079 | (30,682) | 156,035 | (122,070)
Income Tax Benefit (Expense) |  |  |  |
Unrealized net gains (losses) arising during the period | (4,869) | 8,262 | (41,322) | 32,834
Reclassification of net losses (gains) to net income |  |  | (698) |
Other comprehensive income (loss) | (4,869) | 8,262 | (42,020) | 32,834
Net of tax |  |  |  |
Balance, beginning | (3,011) | (156,373) | (103,816) | (74,117)
Unrealized net gains (losses) arising during the period | 13,210 | (22,420) | 112,121 | (89,236)
Reclassification of net losses (gains) to net income |  |  | 1,894 |
Other comprehensive income (loss) | 13,210 | (22,420) | 114,015 | (89,236)
Balance, ending | $ 10,199 | (178,793) | $ 10,199 | (178,793)
Investment securities: | Early Adoption | ASU 2018-02 |  |  |  |
Net of tax |  |  |  |
Other comprehensive income (loss) |  |  |  | (15,440)
Cash flow derivative hedges: |  |  |  |
Pre-tax Amount |  |  |  |
Unrealized net (losses) gains arising during the period |  | 178 |  | 1,341
Other comprehensive income (loss) |  | 178 |  | 1,341
Income Tax Benefit (Expense) |  |  |  |
Unrealized net gains (losses) arising during the period |  | (47) |  | (353)
Other comprehensive income (loss) |  | (47) |  | (353)
Net of tax |  |  |  |
Balance, beginning |  | 5,302 |  | 3,680
Unrealized net gains (losses) arising during the period |  | 131 |  | 988
Other comprehensive income (loss) |  | 131 |  | 988
Balance, ending |  | $ 5,433 |  | 5,433
Cash flow derivative hedges: | Early Adoption | ASU 2018-02 |  |  |  |
Net of tax |  |  |  |
Other comprehensive income (loss) |  |  |  | $ 765

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