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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, 2020 | Mar. 31, 2020 | Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of period | $ 5,055,580 |  | $ 5,076,008 |  | $ 4,846,521 |  | $ 4,785,380 |  | $ 5,076,008 |  | $ 4,785,380 |
Net unrealized gains/(losses) | 610 |  |  |  | 55,566 |  |  |  | 102,043 |  | 108,117 |
Amounts reclassified from AOCI | 756 |  |  |  | 3,096 |  |  |  | 2,767 |  | 6,010 |
Other comprehensive income/(loss) | 1,366 |  | 103,444 |  | 58,662 |  | 55,465 |  | 104,810 |  | 114,127 |
Balance, end of period | 5,208,385 |  | 5,055,580 |  | 4,926,081 |  | 4,846,521 |  | 5,208,385 |  | 4,926,081 |
Securities AFS |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of period | 119,357 |  | 31,079 |  | (27,121) |  | (75,736) |  | 31,079 |  | (75,736) |
Net unrealized gains/(losses) | (1,030) |  |  |  | 47,991 |  |  |  | 87,248 |  | 96,606 |
Amounts reclassified from AOCI | 0 |  |  |  | 201 |  |  |  | 0 |  | 201 |
Other comprehensive income/(loss) | (1,030) |  |  |  | 48,192 |  |  |  | 87,248 |  | 96,807 |
Balance, end of period | 118,327 |  | 119,357 |  | 21,071 |  | (27,121) |  | 118,327 |  | 21,071 |
Cash Flow Hedges |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of period | 16,288 |  | 3,227 |  | (6,725) |  | (12,112) |  | 3,227 |  | (12,112) |
Net unrealized gains/(losses) | 1,640 |  |  |  | 7,575 |  |  |  | 14,795 |  | 11,511 |
Amounts reclassified from AOCI | (1,623) |  |  |  | 1,334 |  |  |  | (1,717) |  | 2,785 |
Other comprehensive income/(loss) | 17 |  |  |  | 8,909 |  |  |  | 13,078 |  | 14,296 |
Balance, end of period | 16,305 |  | 16,288 |  | 2,184 |  | (6,725) |  | 16,305 |  | 2,184 |
Pension and Post-retirement Plans |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of period | (271,809) |  | (273,914) |  | (287,305) |  | (288,768) |  | (273,914) |  | (288,768) |
Net unrealized gains/(losses) | 0 |  |  |  | 0 |  |  |  | 0 |  | 0 |
Amounts reclassified from AOCI | 2,379 |  |  |  | 1,561 |  |  |  | 4,484 |  | 3,024 |
Other comprehensive income/(loss) | 2,379 |  |  |  | 1,561 |  |  |  | 4,484 |  | 3,024 |
Balance, end of period | (269,430) |  | (271,809) |  | (285,744) |  | (287,305) |  | (269,430) |  | (285,744) |
Total |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of period | (136,164) | [1] | (239,608) | [1] | (321,151) | [2] | (376,616) | [2] | (239,608) | [1] | (376,616) | [2]
Other comprehensive income/(loss) | 1,366 | [1] | 103,444 | [1] | 58,662 | [1] | 55,465 | [2] |  |  |  |
Balance, end of period | $ (134,798) | [1] | $ (136,164) | [1] | $ (262,489) | [2] | $ (321,151) | [2] | $ (134,798) | [1] | $ (262,489) | [2]
[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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