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Acquisitions and Divestitures (Narrative) (Details) | 9 Months Ended | 10 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Oct. 02, 2015 USD ($) number | Oct. 17, 2014 USD ($) number | Sep. 30, 2015 USD ($) | Dec. 31, 2014 USD ($) | Sep. 30, 2014 USD ($) | Dec. 31, 2013 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill |  |  | $ 145,932,000 | $ 145,932,000 | $ 141,943,000 | $ 141,943,000
Branch Acquisition | As Recorded by FHN |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquisition date |  | Oct. 17, 2014 |  |  |  |
Number Of Bank Branches | number |  | 13 |  |  |  |
Assets acquired |  | $ 437,600,000 |  |  |  |
Cash and cash equivalents |  | 413,400,000 |  |  |  |
Premises and equipment |  | 7,500,000 |  |  |  |
Goodwill and intangible assets |  | 15,700,000 |  |  |  |
Deposits assumed |  | 437,200,000 |  |  |  |
Goodwill |  | 4,000,000 |  |  |  |
Acquisition goodwill expected to be tax deductible |  | $ 4,000,000 |  |  |  |
Deposit Premium |  | 3.32% |  |  |  |
Trustatlantic Financial Corporation | As Recorded by FHN |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquisition date | Oct. 02, 2015 |  |  |  |  |
Business Acquisition, Name of Acquired Entity | TrustAtlantic Financial Corporation |  |  |  |  |
Number Of Bank Branches | number | 5 |  |  |  |  |
Aggregate transaction value | $ 95,000,000 |  |  |  |  |

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