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Accumulated Other Comprehensive Loss - Changes, Net of Tax (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Net of tax |  |  |  |
Balance, beginning | $ 2,659,441 | $ 2,459,175 | $ 2,524,839 | $ 2,532,551
Net income | 74,199 | 67,388 | 216,556 | 204,399
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
ASU 2018-02 | Early Adoption |  |  |  |
Net of tax |  |  |  |
Other comprehensive income (loss) |  |  |  | (20,068)
Accumulated other comprehensive Income (loss) |  |  |  |
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) | ASU 2018-02 | Early Adoption |  |  |  |
Net of tax |  |  |  |
Other comprehensive income (loss) |  |  |  | (20,068)
Pension and other benefits, net change in pension and other benefits |  |  |  |
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 | ASU 2018-02 | Early Adoption |  |  |  |
Net of tax |  |  |  |
Other comprehensive income (loss) |  |  |  | (5,393)
Investment securities: |  |  |  |
Net of tax |  |  |  |
Balance, beginning | (3,011) | (156,373) | (103,816) | (74,117)
Other comprehensive income (loss) | 13,210 | (22,420) | 114,015 | (89,236)
Balance, ending | $ 10,199 | (178,793) | $ 10,199 | (178,793)
Investment securities: | ASU 2018-02 | Early Adoption |  |  |  |
Net of tax |  |  |  |
Other comprehensive income (loss) |  |  |  | (15,440)
Cash flow derivative hedges: |  |  |  |
Net of tax |  |  |  |
Balance, beginning |  | 5,302 |  | 3,680
Other comprehensive income (loss) |  | 131 |  | 988
Balance, ending |  | $ 5,433 |  | 5,433
Cash flow derivative hedges: | ASU 2018-02 | Early Adoption |  |  |  |
Net of tax |  |  |  |
Other comprehensive income (loss) |  |  |  | $ 765

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