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Term Borrowings (Schedule of Information Pertaining To Term Borrowings) (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Debt Instrument [Line Items] |  |  |  |  |
Term borrowings (Note 10) | $ 1,218,097 |  | $ 1,040,656 |  |
Loans, net of unearned income | 27,658,929 | [1] | 19,589,520 | [1] | $ 17,686,502
Retail Real Estate Residential |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Loans, net of unearned income | 24,200 |  | 35,900 |  |
First Tennessee Bank National Association | Senior Notes | Maturity date – December 1, 2019 – 2.95% |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Term borrowings (Note 10) | $ 396,105 |  | 399,384 |  |
Stated interest rate | 2.95% |  |  |  |
First Tennessee Bank National Association | Collateralized By Loans | Other collateralized borrowings – Maturity date – December 22, 2037 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Term borrowings (Note 10) | $ 65,356 |  | $ 64,812 |  |
Effective interest rate | 1.89% |  | 1.26% |  |
First Tennessee Bank National Association | Collateralized By Loans | Other collateralized borrowings - SBA loans |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt, Weighted Average Interest Rate | 3.26% |  |  |  |
Term borrowings (Note 10) | $ 7,416 |  | $ 0 |  |
First Tennessee Bank National Association | Federal Home Loan Bank Borrowings | Maturity date – August 2, 2018 – 0.00% |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Term borrowings (Note 10) | $ 100 |  | 100 |  |
Stated interest rate | 0.00% |  |  |  |
First Horizon National Corporation | Senior Notes | Maturity date – December 15, 2020 – 3.50% |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Term borrowings (Note 10) | $ 486,513 |  | 489,202 |  |
Stated interest rate | 3.50% |  |  |  |
First Horizon National Corporation | Junior Subordinated Debt | Maturity date - July 31, 2031 - 4.96% |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Term borrowings (Note 10) | $ 4,124 |  | 0 |  |
Stated interest rate | 4.96% |  |  |  |
First Horizon National Corporation | Junior Subordinated Debt | Maturity date - July 31, 2031 - 4.96% |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Term borrowings (Note 10) | $ 5,155 |  | 0 |  |
Stated interest rate | 4.96% |  |  |  |
First Horizon National Corporation | Junior Subordinated Debt | Maturity date - December 30, 2032 - 5.04% |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Term borrowings (Note 10) | $ 5,155 |  | 0 |  |
Stated interest rate | 5.04% |  |  |  |
First Horizon National Corporation | Junior Subordinated Debt | Maturity date - June 26, 2033 - 4.77% |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Term borrowings (Note 10) | $ 10,310 |  | 0 |  |
Stated interest rate | 4.77% |  |  |  |
First Horizon National Corporation | Junior Subordinated Debt | Maturity date - October 8, 2033 - 4.21% |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Term borrowings (Note 10) | $ 10,310 |  | 0 |  |
Stated interest rate | 4.21% |  |  |  |
First Horizon National Corporation | Junior Subordinated Debt | Maturity date - February 8, 2034 - 4.23% |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Term borrowings (Note 10) | $ 10,310 |  | 0 |  |
Stated interest rate | 4.23% |  |  |  |
First Horizon National Corporation | Junior Subordinated Debt | Maturity date - June 26, 2035 - 3.27% |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Term borrowings (Note 10) | $ 2,708 |  | 0 |  |
Stated interest rate | 3.27% |  |  |  |
First Horizon National Corporation | Junior Subordinated Debt | Maturity date - December 15, 2035 - 2.96% |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Term borrowings (Note 10) | $ 17,270 |  | 0 |  |
Stated interest rate | 2.96% |  |  |  |
First Horizon National Corporation | Junior Subordinated Debt | Maturity date - March 15, 2036 - 2.99% |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Term borrowings (Note 10) | $ 8,667 |  | 0 |  |
Stated interest rate | 2.99% |  |  |  |
First Horizon National Corporation | Junior Subordinated Debt | Maturity date - March 15, 2036 - 3.13% |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Term borrowings (Note 10) | $ 11,482 |  |  |  |
Stated interest rate | 3.13% |  |  |  |
First Horizon National Corporation | Junior Subordinated Debt | Maturity date - June 30, 2036 - 3.01% |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Term borrowings (Note 10) | $ 25,646 |  | 0 |  |
Stated interest rate | 3.01% |  |  |  |
First Horizon National Corporation | Junior Subordinated Debt | Maturity date - July 7, 2036 - 2.91% |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Term borrowings (Note 10) | $ 17,642 |  | 0 |  |
Stated interest rate | 2.91% |  |  |  |
First Horizon National Corporation | Junior Subordinated Debt | Maturity date - June 15, 2037 - 3.24% |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Term borrowings (Note 10) | $ 49,875 |  | 0 |  |
Stated interest rate | 3.24% |  |  |  |
First Horizon National Corporation | Junior Subordinated Debt | Maturity date - September 6, 2037 - 2.94% |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Term borrowings (Note 10) | $ 8,627 |  | 0 |  |
Stated interest rate | 2.94% |  |  |  |
FT Real Estate Securities Company, Inc. | Cumulative Preferred Stock | Maturity date – March 31, 2031 – 9.50% |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Term borrowings (Note 10) | $ 46,100 |  | 46,032 |  |
Stated interest rate | 9.50% |  |  |  |
First Horizon ABS Trusts | Collateralized By Loans | Maturity date – October 25, 2034 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Term borrowings (Note 10) | $ 11,226 |  | $ 23,126 |  |
Effective interest rate | 1.72% |  | 0.93% |  |
First Tennessee New Market Corporation Investments | Maturity date – October 25, 2018 – 4.97% |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Term borrowings (Note 10) | $ 7,301 |  | $ 7,301 |  |
Stated interest rate | 4.97% |  |  |  |
First Tennessee New Market Corporation Investments | Maturity date – February 1, 2033 – 4.97% |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Term borrowings (Note 10) | $ 8,000 |  | 8,000 |  |
Stated interest rate | 4.97% |  |  |  |
First Tennessee New Market Corporation Investments | Maturity date – August 08, 2036 – 2.38% |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Term borrowings (Note 10) | $ 2,699 |  | $ 2,699 |  |
Stated interest rate | 2.38% |  |  |  |
Minimum | First Tennessee Bank National Association | Collateralized By Loans | Other collateralized borrowings - SBA loans |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt term | 5 years |  |  |  |
Maximum | First Tennessee Bank National Association | Collateralized By Loans | Other collateralized borrowings - SBA loans |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt term | 25 years |  |  |  |
[1] | December 31, 2017 and 2016 include $22.7 million and $28.5 million, respectively, of held-to-maturity consumer mortgage loans secured by residential real estate in process of foreclosure.

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