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Preferred Stock (Details) $ / shares in Units, $ in Millions |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 31, 2013 USD ($) shares | Dec. 31, 2005 $ / shares shares | Dec. 31, 2000 $ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2016 USD ($) $ / shares shares
Class of Stock [Line Items] |  |  |  |  |
Preferred stock, shares issued (shares) |  |  |  | 1,000 | 1,000
Liquidation preference per share (in dollars per share) | $ / shares |  |  |  | $ 100,000 | $ 100,000
Noncontrolling interest, subsidiary preferred stock | $ |  |  |  | $ 0.6 |
First Horizon National Corporation | Series A Preferred Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Preferred stock, shares issued (shares) | 1,000 |  |  |  |
Aggregate liquidation preference | $ | $ 100.0 |  |  |  |
Proceeds from issuance of preferred stock | $ | $ 96.0 |  |  |  |
Percentage of cumulative preferred stock | 6.20% |  |  |  |
Value of depositary share | 0.00025 |  |  |  |
FT Real Estate Securities Company, Inc. | Preferred Class B |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Percentage of cumulative preferred stock |  |  | 9.50% |  |
Stock issued (shares) |  |  | 50 |  |
Liquidation preference per share (in dollars per share) | $ / shares |  |  | $ 1,000,000 |  |
First Tennessee Bank National Association | Noncumulative Preferred Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Stock issued (shares) |  | 300,000 |  |  |
Liquidation preference per share (in dollars per share) | $ / shares |  | $ 1,000 |  |  |
Declared and accrued preferred stock dividend basis spread on variable rate |  | 0.85% |  |  |
Declared and accrued preferred stock dividend fixed |  | 3.75% |  |  |
First Tennessee Bank National Association | Preferred Class A |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Noncontrolling interest, subsidiary preferred stock | $ |  |  |  | $ 294.8 | $ 294.8
Non Affiliates | FT Real Estate Securities Company, Inc. | Preferred Class B |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Stock issued (shares) |  |  | 47 |  |

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