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Components of Other Comprehensive Income/(Loss) - Schedule of Changes in AOCI (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Jan. 01, 2019 | Jan. 01, 2018 | Dec. 31, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance, adjusted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,580,488
Balance, beginning of period |  | $ 4,846,521 |  | $ 4,785,380 |  | $ 4,572,528 |  | $ 4,580,488 |  | $ 4,785,380 |  | $ 4,580,488 |  |  |  |  |  |
Beginning balance, as adjusted |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,784,369 |  | $ 4,580,555 |  |
Net unrealized gains/(losses) |  | 55,566 |  |  |  | (24,551) |  |  |  | 108,117 |  | (92,693) |  |  |  |  |  |
Amounts reclassified from AOCI |  | 3,096 |  |  |  | 2,522 |  |  |  | 6,010 |  | 3,615 |  |  |  |  |  |
Other comprehensive income/(loss) |  | 58,662 |  | 55,465 |  | (22,029) |  | (67,049) |  | 114,127 |  | (89,078) |  |  |  |  |  |
Balance, end of period |  | 4,926,081 |  | 4,846,521 |  | 4,549,749 |  | 4,572,528 |  | 4,926,081 |  | 4,549,749 |  |  |  |  |  |
Securities AFS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance, adjusted | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (26,834)
Balance, beginning of period |  | (27,121) |  | (75,736) |  | (86,382) |  |  |  | (75,736) |  |  |  |  |  |  |  |
Adjustment to reflect adoption of ASU 2016-01 and ASU 2017-12 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (5)
Beginning balance, as adjusted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (26,839)
Net unrealized gains/(losses) |  | 47,991 |  |  |  | (21,094) |  |  |  | 96,606 |  | (80,598) |  |  |  |  |  |
Amounts reclassified from AOCI |  | 201 |  |  |  | 0 |  |  |  | 201 |  | (39) |  |  |  |  |  |
Other comprehensive income/(loss) |  | 48,192 |  |  |  | (21,094) |  |  |  | 96,807 |  | (80,637) |  |  |  |  |  |
Balance, end of period |  | 21,071 |  | (27,121) |  | (107,476) |  | (86,382) |  | 21,071 |  | (107,476) |  |  |  |  |  |
Cash Flow Hedges |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance, adjusted | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (7,764)
Balance, beginning of period |  | (6,725) |  | (12,112) |  | (16,763) |  |  |  | (12,112) |  |  |  |  |  |  |  |
Adjustment to reflect adoption of ASU 2016-01 and ASU 2017-12 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (206)
Beginning balance, as adjusted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (7,970)
Net unrealized gains/(losses) |  | 7,575 |  |  |  | (3,457) |  |  |  | 11,511 |  | (12,095) |  |  |  |  |  |
Amounts reclassified from AOCI |  | 1,334 |  |  |  | 463 |  |  |  | 2,785 |  | 308 |  |  |  |  |  |
Other comprehensive income/(loss) |  | 8,909 |  |  |  | (2,994) |  |  |  | 14,296 |  | (11,787) |  |  |  |  |  |
Balance, end of period |  | 2,184 |  | (6,725) |  | (19,757) |  | (16,763) |  | 2,184 |  | (19,757) |  |  |  |  |  |
Pension and Post-retirement Plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance, adjusted | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (288,227)
Balance, beginning of period |  | (287,305) |  | (288,768) |  | (286,940) |  |  |  | (288,768) |  |  |  |  |  |  |  |
Adjustment to reflect adoption of ASU 2016-01 and ASU 2017-12 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0
Beginning balance, as adjusted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (288,227)
Net unrealized gains/(losses) |  | 0 |  |  |  | 0 |  |  |  | 0 |  | 0 |  |  |  |  |  |
Amounts reclassified from AOCI |  | 1,561 |  |  |  | 2,059 |  |  |  | 3,024 |  | 3,346 |  |  |  |  |  |
Other comprehensive income/(loss) |  | 1,561 |  |  |  | 2,059 |  |  |  | 3,024 |  | 3,346 |  |  |  |  |  |
Balance, end of period |  | (285,744) |  | (287,305) |  | (284,881) |  | (286,940) |  | (285,744) |  | (284,881) |  |  |  |  |  |
Total |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance, adjusted | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (322,825)
Balance, beginning of period |  | (321,151) | [2] | (376,616) | [2] | (390,085) | [2] | (265,279) | [1] | (376,616) | [2] | (265,279) | [1] |  |  |  |  |
Adjustment to reflect adoption of ASU 2016-01 and ASU 2017-12 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (211)
Beginning balance, as adjusted |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (376,616) | [2] | $ (323,036) | [1] | $ (323,036)
Other comprehensive income/(loss) |  | 58,662 | [2] | 55,465 | [2] | (22,029) | [2] | (67,049) | [1] |  |  |  |  |  |  |  |  |
Balance, end of period | [2] | $ (262,489) |  | $ (321,151) |  | $ (412,114) |  | $ (390,085) |  | $ (262,489) |  | $ (412,114) |  |  |  |  |  |
[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.
[2] | 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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