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Term Borrowings (Schedule Of Information Pertaining To Term Borrowings) (Details)
 12 Months Ended
Dec. 31, 2014
USD ($)
number
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Debt Instrument [Line Items]      
Term borrowings $ 1,880,105,000 $ 1,739,859,000  
Loans, net of unearned income $ 16,230,166,000 15,389,074,000 $ 16,708,582,000
Number of previously consolidated on-balance sheet consumer loan securitizations extinguished | number 3    
Retail Real Estate Residential [Member]      
Debt Instrument [Line Items]      
Loans, net of unearned income $ 76,800,000 $ 344,900,000  
Debt Instrument Maturity Date - 1/15/15 - 5.05%      
Debt Instrument [Line Items]      
Debt instrument maturity date Jan. 15, 2015    
Debt instrument interest rate 5.05%    
Debt Instrument Maturity Date - 4/1/16 - 5.65%      
Debt Instrument [Line Items]      
Debt instrument maturity date Apr. 01, 2016    
Debt instrument interest rate 5.65%    
Debt Instrument Maturity Date - 12/1/19 - 2.95%      
Debt Instrument [Line Items]      
Debt instrument maturity date Dec. 01, 2019    
Debt instrument interest rate 2.95%    
Debt Instrument Maturity Date - 12/22/2037      
Debt Instrument [Line Items]      
Debt instrument maturity date Dec. 22, 2037    
Debt instrument interest rate at period end 0.54% 0.54%  
Debt Instrument Maturity Date - 12/15/15 - 5.375%      
Debt Instrument [Line Items]      
Debt instrument maturity date Dec. 15, 2015    
Debt instrument interest rate 5.375%    
Debt Insturment Maturity Date - 4/15/34 - 6.30%      
Debt Instrument [Line Items]      
Debt instrument maturity date Apr. 15, 2034    
Debt instrument interest rate 6.30%    
Debt Insturment Maturity Date - 3/31/31 - 9.50%      
Debt Instrument [Line Items]      
Debt instrument maturity date Mar. 31, 2031    
Debt instrument interest rate 9.50%    
Debt Insturment Maturity Date - 10/26/26      
Debt Instrument [Line Items]      
Debt instrument maturity date Oct. 26, 2026    
Debt instrument interest rate at period end   0.30%  
Debt Instrument Maturity Date - 9/25/29      
Debt Instrument [Line Items]      
Debt instrument maturity date Sep. 25, 2029    
Debt instrument interest rate at period end   0.30%  
Debt Instrument Maturity Date - 9/1/32      
Debt Instrument [Line Items]      
Debt instrument maturity date Sep. 01, 2032    
Debt instrument interest rate at period end   6.45%  
Debt Insturment Maturity Date - 10/25/34      
Debt Instrument [Line Items]      
Debt instrument maturity date Oct. 25, 2034    
Debt instrument interest rate at period end 0.33% 0.33%  
Debt Instrument Maturity Date - 10/25/18 - 4.97%      
Debt Instrument [Line Items]      
Debt instrument maturity date Oct. 25, 2018    
Debt instrument interest rate at period end 4.97%    
Debt Instrument Maturity Date - 2/1/33 - 4.97%      
Debt Instrument [Line Items]      
Debt instrument maturity date Feb. 01, 2033    
Debt instrument interest rate 4.97%    
Debt Instrument Maturity Date - 8/8/36 - 2.38%      
Debt Instrument [Line Items]      
Debt instrument maturity date Aug. 08, 2036    
Debt instrument interest rate 2.38%    
Federal Home Loan Bank Borrowings      
Debt Instrument [Line Items]      
Debt instrument weighted average interest rate   2.41%  
First Tennessee Bank National Association [Member] | Subordinated Debt | Debt Instrument Maturity Date - 1/15/15 - 5.05%      
Debt Instrument [Line Items]      
Term borrowings [1],[2] $ 304,525,000 $ 317,714,000  
First Tennessee Bank National Association [Member] | Subordinated Debt | Debt Instrument Maturity Date - 4/1/16 - 5.65%      
Debt Instrument [Line Items]      
Term borrowings [1],[2] 264,667,000 276,273,000  
First Tennessee Bank National Association [Member] | Senior capital notes | Debt Instrument Maturity Date - 12/1/19 - 2.95%      
Debt Instrument [Line Items]      
Term borrowings 398,011,000 [2] 0  
First Tennessee Bank National Association [Member] | Collateralized By Loans [Member] | Debt Instrument Maturity Date - 12/22/2037      
Debt Instrument [Line Items]      
Term borrowings [3] 62,562,000 60,223,000  
First Tennessee Bank National Association [Member] | Federal Home Loan Bank Borrowings      
Debt Instrument [Line Items]      
Term borrowings 0 2,390,000 [4]  
First Horizon National Corporation | Subordinated Debt | Debt Insturment Maturity Date - 4/15/34 - 6.30%      
Debt Instrument [Line Items]      
Term borrowings [2] 212,474,000 192,014,000  
First Horizon National Corporation | Senior capital notes | Debt Instrument Maturity Date - 12/15/15 - 5.375%      
Debt Instrument [Line Items]      
Term borrowings [2] 508,358,000 516,584,000  
FT Real Estate Securities Company, Inc. [Member] | Cumulative Preferred | Debt Insturment Maturity Date - 3/31/31 - 9.50%      
Debt Instrument [Line Items]      
Term borrowings [1] 45,896,000 45,828,000  
First Horizon ABS Trusts [Member] | Collateralized By Loans [Member] | Debt Insturment Maturity Date - 10/26/26      
Debt Instrument [Line Items]      
Term borrowings [5],[6] 0 98,631,000  
First Horizon ABS Trusts [Member] | Collateralized By Loans [Member] | Debt Instrument Maturity Date - 9/25/29      
Debt Instrument [Line Items]      
Term borrowings [5],[6] 0 122,562,000  
First Horizon ABS Trusts [Member] | Collateralized By Loans [Member] | Debt Instrument Maturity Date - 9/1/32      
Debt Instrument [Line Items]      
Term borrowings [5],[6] 0 8,783,000  
First Horizon ABS Trusts [Member] | Collateralized By Loans [Member] | Debt Insturment Maturity Date - 10/25/34      
Debt Instrument [Line Items]      
Term borrowings [6] 65,612,000 80,857,000  
First Tennessee New Market Corporation Investments [Member] | Debt Instrument Maturity Date - 10/25/18 - 4.97%      
Debt Instrument [Line Items]      
Term borrowings 7,301,000 7,301,000  
First Tennessee New Market Corporation Investments [Member] | Debt Instrument Maturity Date - 2/1/33 - 4.97%      
Debt Instrument [Line Items]      
Term borrowings 8,000,000 8,000,000  
First Tennessee New Market Corporation Investments [Member] | Debt Instrument Maturity Date - 8/8/36 - 2.38%      
Debt Instrument [Line Items]      
Term borrowings $ 2,699,000 $ 2,699,000  
Minimum [Member] | Federal Home Loan Bank Borrowings      
Debt Instrument [Line Items]      
Debt instrument, interest rates with remaining terms   1 year  
Maximum [Member] | Federal Home Loan Bank Borrowings      
Debt Instrument [Line Items]      
Debt instrument, interest rates with remaining terms   16 years  
[1] A portion q ualifies for total capital under the risk-based capital guidelines.
[2] Changes in the fair value of debt attributable to interest rate risk is hedged. Refer to Note 23 – Derivatives.
[3] Secured by trust preferred loans.
[4] The Federal Home Loan Bank borrowings were issued with fixed interest rates and had remaining terms of 1 to 16 years at December, 31 2013. These borrowings had weighted average interest rate of 2.41 percent on December 31, 2013.
[5] In 2014, FHN resolved three previously consolidated on-balance sheet consumer loan securitizations and the collateralized borrowings were extinguished.
[6] On December 31, 2014 and 2013, borrowings se cured by $76.8 million and $344.9 million, respectively, of residential real estate loans.