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Term Borrowings - Schedule of Information Pertaining To Term Borrowings (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Debt Instrument [Line Items] |  |  |  |  |
Term borrowings | $ 1,170,963 |  | $ 1,218,097 |  |
Loans, net of unearned income | 27,535,532 | [1] | 27,658,929 | [1] | $ 19,589,520
Retail Real Estate Residential |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Loans, net of unearned income | 16,200 |  | 24,200 |  |
First Tennessee Bank National Association | Senior Notes | Maturity date – December 1, 2019 – 2.95% |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Term borrowings | $ 395,872 |  | 396,105 |  |
Stated interest rate | 2.95% |  |  |  |
First Tennessee Bank National Association | Collateralized By Loans | 3.09% on December 31, 2018 and 1.89% on December 31, 2017 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Term borrowings | $ 76,642 |  | $ 65,356 |  |
Effective interest rate | 3.09% |  | 1.89% |  |
First Tennessee Bank National Association | Collateralized By Loans | Other collateralized borrowings - SBA loans |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Term borrowings | $ 16,607 |  | $ 7,416 |  |
Debt, weighted average interest rate | 3.95% |  | 3.26% |  |
First Tennessee Bank National Association | Federal Home Loan Bank Borrowings | Maturity date – August 2, 2018 – 0.00% |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Term borrowings | $ 0 |  | $ 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 | $ 486,739 |  | $ 486,513 |  |
Stated interest rate | 3.50% |  |  |  |
First Horizon National Corporation | Junior Subordinated Debt | Maturity date - July 31, 2031 - 4.96% on December 31, 2017 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Term borrowings | $ 0 |  | $ 4,124 |  |
Stated interest rate |  |  | 4.96% |  |
First Horizon National Corporation | Junior Subordinated Debt | Maturity date - July 31, 2031 - 4.96% on December 31, 2017 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Term borrowings | 0 |  | $ 5,155 |  |
Stated interest rate |  |  | 4.96% |  |
First Horizon National Corporation | Junior Subordinated Debt | Maturity date - December 30, 2032 - 5.04% on December 31, 2017 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Term borrowings | 0 |  | $ 5,155 |  |
Stated interest rate |  |  | 5.04% |  |
First Horizon National Corporation | Junior Subordinated Debt | Maturity date - June 26, 2033 - 4.77% on December 31, 2017 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Term borrowings | 0 |  | $ 10,310 |  |
Stated interest rate |  |  | 4.77% |  |
First Horizon National Corporation | Junior Subordinated Debt | Maturity date - October 8, 2033 - 4.21% on December 31, 2017 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Term borrowings | 0 |  | $ 10,310 |  |
Stated interest rate |  |  | 4.21% |  |
First Horizon National Corporation | Junior Subordinated Debt | Maturity date - February 8, 2034 - 4.23% on December 31, 2017 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Term borrowings | 0 |  | $ 10,310 |  |
Stated interest rate |  |  | 4.23% |  |
First Horizon National Corporation | Junior Subordinated Debt | Maturity date - June 28, 2035 - 4.47% on December 31, 2018 and 3.27% on December 31, 2017 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Term borrowings | $ 2,730 |  | $ 2,708 |  |
Stated interest rate | 4.47% |  | 3.27% |  |
First Horizon National Corporation | Junior Subordinated Debt | Maturity date - December 15, 2035 - 4.16% on December 31, 2018 and 2.96% on December 31, 2017 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Term borrowings | $ 17,456 |  | $ 17,270 |  |
Stated interest rate | 4.16% |  | 2.96% |  |
First Horizon National Corporation | Junior Subordinated Debt | Maturity date - March 15, 2036 - 4.19% on December 31, 2018 and 2.99% on December 31, 2017 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Term borrowings | $ 8,757 |  | $ 8,667 |  |
Stated interest rate | 4.19% |  | 2.99% |  |
First Horizon National Corporation | Junior Subordinated Debt | Maturity date - March 15, 2036 - 4.33% on December 31, 2018 and 3.13% on December 31, 2017 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Term borrowings | $ 11,587 |  | $ 11,482 |  |
Stated interest rate | 4.33% |  | 3.13% |  |
First Horizon National Corporation | Junior Subordinated Debt | Maturity date - June 30, 2036 - 4.12% on December 31, 2018 and 3.01% on December 31, 2017 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Term borrowings | $ 25,931 |  | $ 25,646 |  |
Stated interest rate | 4.12% |  | 3.01% |  |
First Horizon National Corporation | Junior Subordinated Debt | Maturity date - July 7, 2036 - 3.99% on December 31, 2018 and 2.91% on December 31, 2017 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Term borrowings | $ 17,803 |  | $ 17,642 |  |
Stated interest rate | 3.99% |  | 2.91% |  |
First Horizon National Corporation | Junior Subordinated Debt | Maturity date - June 15, 2037 - 4.44% on December 31, 2018 and 3.24% on December 31, 2017 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Term borrowings | $ 50,278 |  | $ 49,875 |  |
Stated interest rate | 4.44% |  | 3.24% |  |
First Horizon National Corporation | Junior Subordinated Debt | Maturity date - September 6, 2037 - 4.17% on December 31, 2018 and 2.94% on December 31, 2017 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Term borrowings | $ 8,713 |  | $ 8,627 |  |
Stated interest rate | 4.17% |  | 2.94% |  |
FT Real Estate Securities Company, Inc. | Cumulative Preferred Stock | Maturity date – March 31, 2031 – 9.50% |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Term borrowings | $ 46,168 |  | $ 46,100 |  |
Stated interest rate | 9.50% |  |  |  |
First Horizon ABS Trusts | Collateralized By Loans | Maturity date – October 25, 2034 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Term borrowings | $ 2,981 |  | $ 11,226 |  |
Effective interest rate | 2.66% |  | 1.72% |  |
First Tennessee New Market Corporation Investments | Maturity date – October 25, 2018 – 4.97% |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Term borrowings | $ 0 |  | $ 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 | 0 |  | $ 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 | $ 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 | 4 years |  |  |  |
Maximum | First Tennessee Bank National Association | Collateralized By Loans | Other collateralized borrowings - SBA loans |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt term | 26 years |  |  |  |
[1] | December 31, 2018 and 2017 include $28.6 million and $22.7 million, respectively, of held-to-maturity consumer mortgage loans secured by residential real estate in process of foreclosure.

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