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Components of Other Comprehensive Income/(loss) (Schedule of Changes in AOCI) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Beginning Balance | $ (237,462) | $ (152,334) | $ (247,654) |  | $ (214,192) |
Net unrealized gains/(losses) | 4,317 | (9,098) | 13,966 |  | 52,558 |
Amounts reclassified from AOCI | 761 | 604 | 1,304 |  | 806 |
Other comprehensive income/(loss) | 5,078 | (8,494) | 15,270 | [1] | 53,364 | [1]
Ending Balance | (232,384) | (160,828) | (232,384) |  | (160,828) |
Securities AFS |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Beginning Balance | (9,857) | 58,591 | (17,232) |  | 3,394 |
Net unrealized gains/(losses) | 3,918 | (7,887) | 11,570 |  | 48,330 |
Amounts reclassified from AOCI | (1) | 0 | (278) |  | (1,020) |
Other comprehensive income/(loss) | 3,917 | (7,887) | 11,292 |  | 47,310 |
Ending Balance | (5,940) | 50,704 | (5,940) |  | 50,704 |
Cash Flow Hedges |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Beginning Balance | (1,024) | 4,691 | (1,265) |  | 0 |
Net unrealized gains/(losses) | (91) | (1,211) | 1,906 |  | 4,228 |
Amounts reclassified from AOCI | (643) | (359) | (2,399) |  | (1,107) |
Other comprehensive income/(loss) | (734) | (1,570) | (493) |  | 3,121 |
Ending Balance | (1,758) | 3,121 | (1,758) |  | 3,121 |
Pension and Postretirement Plans |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Beginning Balance | (226,581) | (215,616) | (229,157) |  | (217,586) |
Net unrealized gains/(losses) | 490 | 0 | 490 |  | 0 |
Amounts reclassified from AOCI | 1,405 | 963 | 3,981 |  | 2,933 |
Other comprehensive income/(loss) | 1,895 | 963 | 4,471 |  | 2,933 |
Ending Balance | $ (224,686) | $ (214,653) | $ (224,686) |  | $ (214,653) |
[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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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e681-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669686-108580 + Details
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