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Components of Other Comprehensive Income/(Loss) - Schedule of Changes in AOCI (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Balance, January 1 |  |  | $ 4,580,488 |  | $ 2,705,084 |  |  |
Adjustment to reflect adoption of ASU 2016-01 and ASU 2017-12 |  |  |  |  |  |  | $ 67 | $ 0
Beginning balance, as adjusted |  |  |  |  |  |  | 4,580,555 | $ 2,705,084
Net unrealized gains/(losses) | $ (28,441) | $ 4,317 | (121,134) |  | 13,966 |  |  |
Amounts reclassified from AOCI | 2,906 | 761 | 6,521 |  | 1,304 |  |  |
Other comprehensive income/(loss) | (25,535) | 5,078 | (114,613) | [1] | 15,270 | [1] |  |
Balance, September 30 | 4,741,931 | 2,883,551 | 4,741,931 |  | 2,883,551 |  |  |
Securities AFS |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Balance, January 1 | (107,476) | (9,857) | (26,834) |  | (17,232) |  |  |
Adjustment to reflect adoption of ASU 2016-01 and ASU 2017-12 |  |  |  |  |  |  | (5) |
Beginning balance, as adjusted |  |  |  |  |  |  | (26,839) |
Net unrealized gains/(losses) | (25,924) | 3,918 | (106,522) |  | 11,570 |  |  |
Amounts reclassified from AOCI | 0 | (1) | (39) |  | (278) |  |  |
Other comprehensive income/(loss) | (25,924) | 3,917 | (106,561) |  | 11,292 |  |  |
Balance, September 30 | (133,400) | (5,940) | (133,400) |  | (5,940) |  |  |
Cash Flow Hedges |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Balance, January 1 | (19,757) | (1,024) | (7,764) |  | (1,265) |  |  |
Adjustment to reflect adoption of ASU 2016-01 and ASU 2017-12 |  |  |  |  |  |  | (206) |
Beginning balance, as adjusted |  |  |  |  |  |  | (7,970) |
Net unrealized gains/(losses) | (2,517) | (91) | (14,612) |  | 1,906 |  |  |
Amounts reclassified from AOCI | 771 | (643) | 1,079 |  | (2,399) |  |  |
Other comprehensive income/(loss) | (1,746) | (734) | (13,533) |  | (493) |  |  |
Balance, September 30 | (21,503) | (1,758) | (21,503) |  | (1,758) |  |  |
Pension and Post-retirement Plans |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Balance, January 1 | (284,881) | (226,581) | (288,227) |  | (229,157) |  |  |
Adjustment to reflect adoption of ASU 2016-01 and ASU 2017-12 |  |  |  |  |  |  | 0 |
Beginning balance, as adjusted |  |  |  |  |  |  | (288,227) |
Net unrealized gains/(losses) | 0 | 490 | 0 |  | 490 |  |  |
Amounts reclassified from AOCI | 2,135 | 1,405 | 5,481 |  | 3,981 |  |  |
Other comprehensive income/(loss) | 2,135 | 1,895 | 5,481 |  | 4,471 |  |  |
Balance, September 30 | (282,746) | (224,686) | (282,746) |  | (224,686) |  |  |
Total |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Balance, January 1 | (412,114) | (237,462) | (322,825) |  | (247,654) |  |  |
Adjustment to reflect adoption of ASU 2016-01 and ASU 2017-12 |  |  |  |  |  |  | (211) |
Beginning balance, as adjusted |  |  |  |  |  |  | $ (323,036) |
Balance, September 30 | $ (437,649) | $ (232,384) | $ (437,649) |  | $ (232,384) |  |  |
[1] | Due to the nature of the preferred stock issued by FHN and its subsidiaries, all components of Other comprehensive income/(loss) have been attributed solely to FHN as the controlling interest holder.

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