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Components of Other Comprehensive Income/(Loss) - Schedule of Changes in AOCI (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |
Beginning balance |  | $ 4,785,380 | $ 4,580,488 | $ 2,705,084 |
Net unrealized gains/(losses) |  | 125,056 | (64,577) | (20,000) |
Amounts reclassified from AOCI |  | 11,952 | 10,997 | 2,375 |
Other comprehensive income/(loss) |  | 137,008 | (53,580) | (17,625) |
Ending balance |  | 5,076,008 | 4,785,380 | 4,580,488 |
Balance, as adjusted for ASU 2018-02 |  |  |  | 4,580,488 |
Balance as adjusted |  |  | 4,784,369 | 4,580,555 | $ 2,705,084
Accumulated Other Comprehensive Income/(Loss) |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |
Beginning balance | [1] | (376,616) | (265,279) | (247,654) |
Other comprehensive income/(loss) | [1] | 137,008 | (53,580) | (17,625) |
Ending balance | [1] | (239,608) | (376,616) | (265,279) |
Balance, as adjusted for ASU 2018-02 | [1] |  |  | (322,825) |
Balance as adjusted | [1] |  | (376,616) | (323,036) | $ (247,654)
Securities AFS |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |
Beginning balance |  | (75,736) | (21,997) | (17,232) |
Net unrealized gains/(losses) |  | 106,614 | (48,858) | (4,467) |
Amounts reclassified from AOCI |  | 201 | (39) | (298) |
Other comprehensive income/(loss) |  | 106,815 | (48,897) | (4,765) |
Ending balance |  | 31,079 | (75,736) | (21,997) |
Balance, as adjusted for ASU 2018-02 |  |  |  | (26,834) |
Balance as adjusted |  |  |  | (26,839) |
Cash Flow Hedges |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |
Beginning balance |  | (12,112) | (6,366) | (1,265) |
Net unrealized gains/(losses) |  | 11,234 | (6,284) | (2,156) |
Amounts reclassified from AOCI |  | 4,105 | 2,142 | (2,945) |
Other comprehensive income/(loss) |  | 15,339 | (4,142) | (5,101) |
Ending balance |  | 3,227 | (12,112) | (6,366) |
Balance, as adjusted for ASU 2018-02 |  |  |  | (7,764) |
Balance as adjusted |  |  |  | (7,970) |
Pension and Post-retirement Plans |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |
Beginning balance |  | (288,768) | (236,916) | (229,157) |
Net unrealized gains/(losses) |  | 7,208 | (9,435) | (13,377) |
Amounts reclassified from AOCI |  | 7,646 | 8,894 | 5,618 |
Other comprehensive income/(loss) |  | 14,854 | (541) | (7,759) |
Ending balance |  | $ (273,914) | $ (288,768) | (236,916) |
Balance, as adjusted for ASU 2018-02 |  |  |  | (288,227) |
Balance as adjusted |  |  |  | (288,227) |
Accounting Standards Update 2018-02 | Accumulated Other Comprehensive Income/(Loss) |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |
Adjustment to reflect adoption | [1] |  |  | (57,546) |
Accounting Standards Update 2018-02 | Securities AFS |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |
Adjustment to reflect adoption |  |  |  | (4,837) |
Accounting Standards Update 2018-02 | Cash Flow Hedges |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |
Adjustment to reflect adoption |  |  |  | (1,398) |
Accounting Standards Update 2018-02 | Pension and Post-retirement Plans |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |
Adjustment to reflect adoption |  |  |  | (51,311) |
Accounting Standards Update 2016-01 and 2017-12 |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |
Adjustment to reflect adoption |  |  |  | 67 |
Accounting Standards Update 2016-01 and 2017-12 | Accumulated Other Comprehensive Income/(Loss) |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |
Adjustment to reflect adoption | [1] |  |  | (211) |
Accounting Standards Update 2016-01 and 2017-12 | Securities AFS |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |
Adjustment to reflect adoption |  |  |  | (5) |
Accounting Standards Update 2016-01 and 2017-12 | Cash Flow Hedges |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |
Adjustment to reflect adoption |  |  |  | (206) |
Accounting Standards Update 2016-01 and 2017-12 | Pension and Post-retirement Plans |  |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |  |
Adjustment to reflect adoption |  |  |  | $ 0 |
[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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