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Accumulated Other Comprehensive Loss - Changes (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Pre-tax Amount |  |  |  |
Balance | $ (111,823) | $ (8,644) | $ (145,472) | $ (84,722)
Other comprehensive income | 887 | (8,410) | 34,536 | 67,668
Balance | (110,936) | (17,054) | (110,936) | (17,054)
Income Tax Benefit (Expense) |  |  |  |
Balance | 44,172 | 3,417 | 57,461 | 33,463
Other comprehensive income | (350) | 3,322 | (13,639) | (26,724)
Balance | 43,822 | 6,739 | 43,822 | 6,739
Net of tax |  |  |  |
Balance |  |  | 2,476,485 | 2,736,941
Other comprehensive income (loss) | 537 | (5,088) | 20,897 | 40,944
Balance | 2,581,858 | 2,523,963 | 2,581,858 | 2,523,963
Accumulated Other Comprehensive Loss |  |  |  |
Net of tax |  |  |  |
Balance | (67,651) | (5,227) | (88,011) | (51,259)
Other comprehensive income (loss) | 537 | (5,088) | 20,897 | 40,944
Balance | (67,114) | (10,315) | (67,114) | (10,315)
Pension and other benefits |  |  |  |
Pre-tax Amount |  |  |  |
Other comprehensive income |  |  |  | (78)
Income Tax Benefit (Expense) |  |  |  |
Other comprehensive income |  |  |  | 32
Net of tax |  |  |  |
Balance | (30,237) | (26,929) | (30,237) | (26,883)
Other comprehensive income (loss) |  |  |  | (46)
Balance | (30,237) | (26,929) | (30,237) | (26,929)
Pension and other benefits, change due to the Reorganization Transactions |  |  |  |
Pre-tax Amount |  |  |  |
Unrealized net gains (losses) arising during the period |  |  |  | (78)
Income Tax Benefit (Expense) |  |  |  |
Unrealized net gains (losses) arising during the period |  |  |  | 32
Net of tax |  |  |  |
Unrealized net gains (losses) arising during the period |  |  |  | (46)
Investment securities |  |  |  |
Pre-tax Amount |  |  |  |
Unrealized net gains (losses) arising during the period | 212 | (9,925) | 33,005 | 92,590
Reclassification of net gains to net income |  | (30) |  | (25,761)
Other comprehensive income | 212 | (9,955) | 33,005 | 66,829
Income Tax Benefit (Expense) |  |  |  |
Unrealized net gains (losses) arising during the period | (84) | 3,920 | (13,035) | (36,573)
Reclassification of net gains to net income |  | 12 |  | 10,176
Other comprehensive income | (84) | 3,932 | (13,035) | (26,397)
Net of tax |  |  |  |
Balance | (40,116) | 21,349 | (59,958) | (25,106)
Unrealized net gains (losses) arising during the period | 128 | (6,005) | 19,970 | 56,017
Reclassification of gains to net income |  | (18) |  | (15,585)
Other comprehensive income (loss) | 128 | (6,023) | 19,970 | 40,432
Balance | (39,988) | 15,326 | (39,988) | 15,326
Cash flow derivative hedges |  |  |  |
Pre-tax Amount |  |  |  |
Unrealized net gains (losses) arising during the period | 675 | 1,545 | 1,531 | 917
Other comprehensive income | 675 | 1,545 | 1,531 | 917
Income Tax Benefit (Expense) |  |  |  |
Unrealized net gains (losses) arising during the period | (266) | (610) | (604) | (359)
Other comprehensive income | (266) | (610) | (604) | (359)
Net of tax |  |  |  |
Balance | 2,702 | 353 | 2,184 | 730
Unrealized net gains (losses) arising during the period | 409 | 935 | 927 | 558
Other comprehensive income (loss) | 409 | 935 | 927 | 558
Balance | $ 3,111 | $ 1,288 | $ 3,111 | $ 1,288

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