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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, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 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) | $ (24,551) | $ 12,247 | (92,693) |  | 9,649 |  |  |
Amounts reclassified from AOCI | 2,522 | 249 | 3,615 |  | 543 |  |  |
Other comprehensive income/(loss) | (22,029) | 12,496 | (89,078) | [1] | 10,192 | [1] |  |
Balance, June 30 | 4,549,749 | 2,826,888 | 4,549,749 |  | 2,826,888 |  |  |
Securities AFS |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Balance, January 1 | (86,382) | (18,795) | (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) | (21,094) | 9,188 | (80,598) |  | 7,652 |  |  |
Amounts reclassified from AOCI | 0 | (250) | (39) |  | (277) |  |  |
Other comprehensive income/(loss) | (21,094) | 8,938 | (80,637) |  | 7,375 |  |  |
Balance, June 30 | (107,476) | (9,857) | (107,476) |  | (9,857) |  |  |
Cash Flow Hedges |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Balance, January 1 | (16,763) | (3,179) | (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) | (3,457) | 3,059 | (12,095) |  | 1,997 |  |  |
Amounts reclassified from AOCI | 463 | (904) | 308 |  | (1,756) |  |  |
Other comprehensive income/(loss) | (2,994) | 2,155 | (11,787) |  | 241 |  |  |
Balance, June 30 | (19,757) | (1,024) | (19,757) |  | (1,024) |  |  |
Pension and Post-retirement Plans |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Balance, January 1 | (286,940) | (227,984) | (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 | 0 | 0 |  | 0 |  |  |
Amounts reclassified from AOCI | 2,059 | 1,403 | 3,346 |  | 2,576 |  |  |
Other comprehensive income/(loss) | 2,059 | 1,403 | 3,346 |  | 2,576 |  |  |
Balance, June 30 | (284,881) | (226,581) | (284,881) |  | (226,581) |  |  |
Total |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Balance, January 1 | (390,085) | (249,958) | (322,825) |  | (247,654) |  |  |
Adjustment to reflect adoption of ASU 2016-01 and ASU 2017-12 |  |  |  |  |  |  | (211) |
Beginning balance, as adjusted |  |  |  |  |  |  | $ (323,036) |
Balance, June 30 | $ (412,114) | $ (237,462) | $ (412,114) |  | $ (237,462) |  |  |
[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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