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Accumulated Other Comprehensive Loss - Changes, Net of Tax (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Net of tax |  |  |  |
Balance, beginning | $ 2,613,202,000 | $ 2,520,862,000 | $ 2,524,839,000 | $ 2,532,551,000
Net income | 72,433,000 | 69,053,000 | 142,357,000 | 137,011,000
Other comprehensive income (loss) | 46,770,000 | (17,726,000) | 100,211,000 | (65,959,000)
Balance, ending | 2,659,441,000 | 2,459,175,000 | 2,659,441,000 | 2,459,175,000
ASU 2018-02 | Early Adoption |  |  |  |
Net of tax |  |  |  |
Other comprehensive income (loss) |  |  |  | (20,068,000)
Accumulated other comprehensive Income (loss) |  |  |  |
Net of tax |  |  |  |
Balance, beginning | (78,754,000) | (164,684,000) | (132,195,000) | (96,383,000)
Other comprehensive income (loss) | 46,770,000 | (17,726,000) | 100,211,000 | (65,959,000)
Balance, ending | (31,984,000) | (182,410,000) | (31,984,000) | (182,410,000)
Accumulated other comprehensive Income (loss) | ASU 2018-02 | Early Adoption |  |  |  |
Net of tax |  |  |  |
Other comprehensive income (loss) |  |  |  | (20,068,000)
Pension and other benefits, net change in pension and other benefits |  |  |  |
Net of tax |  |  |  |
Balance, beginning | (28,379,000) | (31,339,000) | (28,379,000) | (25,946,000)
Other comprehensive income (loss) | (594,000) |  | (594,000) |
Balance, ending | (28,973,000) | (31,339,000) | (28,973,000) | (31,339,000)
Pension and other benefits, net change in pension and other benefits | ASU 2018-02 | Early Adoption |  |  |  |
Net of tax |  |  |  |
Other comprehensive income (loss) |  |  |  | (5,393,000)
Investment securities: |  |  |  |
Net of tax |  |  |  |
Balance, beginning | (50,375,000) | (138,334,000) | (103,816,000) | (74,117,000)
Other comprehensive income (loss) | 47,364,000 | (18,039,000) | 100,805,000 | (66,816,000)
Balance, ending | $ (3,011,000) | (156,373,000) | $ (3,011,000) | (156,373,000)
Investment securities: | ASU 2018-02 | Early Adoption |  |  |  |
Net of tax |  |  |  |
Other comprehensive income (loss) |  |  |  | (15,440,000)
Cash flow derivative hedges: |  |  |  |
Net of tax |  |  |  |
Balance, beginning |  | 4,989,000 |  | 3,680,000
Other comprehensive income (loss) |  | 313,000 |  | 857,000
Balance, ending |  | $ 5,302,000 |  | 5,302,000
Cash flow derivative hedges: | ASU 2018-02 | Early Adoption |  |  |  |
Net of tax |  |  |  |
Other comprehensive income (loss) |  |  |  | $ 765,000

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