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Components of Other Comprehensive Income/(Loss) (Schedule of Changes in AOCI) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Beginning balance |  | $ 2,705,084 | $ 2,639,586 | $ 2,581,590
Other comprehensive income/(loss) |  | (17,625) | (33,462) | (25,946)
Ending balance |  | 4,580,488 | 2,705,084 | 2,639,586
Ending balance, as adjusted |  | 4,580,488 | 2,705,084 |
Accumulated Other Comprehensive Income/(Loss) |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | [1] | (247,654) | (214,192) | (188,246)
Net unrealized gains/(losses) |  | (20,000) | (35,901) | (25,172)
Amounts reclassified from AOCI |  | 2,375 | 2,439 | (774)
Other comprehensive income/(loss) | [1] | (17,625) | (33,462) | (25,946)
Ending balance | [1] | (265,279) | (247,654) | (214,192)
Adjustment to reflect adoption of ASU 2018-02 | [1] | (57,546) |  |
Ending balance, as adjusted | [1] | (322,825) | (247,654) |
Securities AFS |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Beginning balance |  | (17,232) | 3,394 | 18,581
Net unrealized gains/(losses) |  | (4,467) | (19,709) | (14,055)
Amounts reclassified from AOCI |  | (298) | (917) | (1,132)
Other comprehensive income/(loss) |  | (4,765) | (20,626) | (15,187)
Ending balance |  | (21,997) | (17,232) | 3,394
Adjustment to reflect adoption of ASU 2018-02 |  | (4,837) |  |
Ending balance, as adjusted |  | (26,834) |  |
Cash Flow Hedges |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Beginning balance |  | (1,265) | 0 | 0
Net unrealized gains/(losses) |  | (2,156) | 130 | 0
Amounts reclassified from AOCI |  | (2,945) | (1,395) | 0
Other comprehensive income/(loss) |  | (5,101) | (1,265) | 0
Ending balance |  | (6,366) | (1,265) | 0
Adjustment to reflect adoption of ASU 2018-02 |  | (1,398) |  |
Ending balance, as adjusted |  | (7,764) |  |
Pension and Postretirement Plans |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Beginning balance |  | (229,157) | (217,586) | (206,827)
Net unrealized gains/(losses) |  | (13,377) | (16,322) | (11,117)
Amounts reclassified from AOCI |  | 5,618 | 4,751 | 358
Other comprehensive income/(loss) |  | (7,759) | (11,571) | (10,759)
Ending balance |  | (236,916) | $ (229,157) | $ (217,586)
Adjustment to reflect adoption of ASU 2018-02 |  | (51,311) |  |
Ending balance, as adjusted |  | $ (288,227) |  |
[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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