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Term Borrowings (Schedule Of Information Pertaining To Term Borrowings) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Debt Instrument [Line Items]      
Term borrowings $ 1,315,176,000 $ 1,880,105,000  
Loans, net of unearned income 17,686,502,000 [1] 16,230,166,000 $ 15,389,074,000
Retail Real Estate Residential [Member]      
Debt Instrument [Line Items]      
Loans, net of unearned income $ 52,800,000 $ 76,800,000  
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 0.81% 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 Instrument Maturity Date - 12/15/20 - 3.50%      
Debt Instrument [Line Items]      
Debt instrument maturity date Dec. 15, 2020    
Debt instrument interest rate 3.50%    
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 - 10/25/34      
Debt Instrument [Line Items]      
Debt instrument maturity date Oct. 25, 2034    
Debt instrument interest rate at period end 0.59% 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 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%    
First Tennessee Bank National Association [Member] | Subordinated Debt | Debt Instrument Maturity Date - 1/15/15 - 5.05%      
Debt Instrument [Line Items]      
Term borrowings [2],[3] $ 0 $ 304,525,000  
First Tennessee Bank National Association [Member] | Subordinated Debt | Debt Instrument Maturity Date - 4/1/16 - 5.65%      
Debt Instrument [Line Items]      
Term borrowings [2],[3] 252,893,000 264,667,000  
First Tennessee Bank National Association [Member] | Senior capital notes | Debt Instrument Maturity Date - 12/1/19 - 2.95%      
Debt Instrument [Line Items]      
Term borrowings [3] 401,586,000 398,011,000  
First Tennessee Bank National Association [Member] | Collateralized By Loans [Member] | Debt Instrument Maturity Date - 12/22/2037      
Debt Instrument [Line Items]      
Term borrowings [4] 64,365,000 62,562,000  
First Horizon National Corporation | Subordinated Debt | Debt Insturment Maturity Date - 4/15/34 - 6.30%      
Debt Instrument [Line Items]      
Term borrowings [3] 0 212,474,000  
First Horizon National Corporation | Senior capital notes | Debt Instrument Maturity Date - 12/15/15 - 5.375%      
Debt Instrument [Line Items]      
Term borrowings [3] 0 508,358,000  
First Horizon National Corporation | Senior capital notes | Debt Instrument Maturity Date - 12/15/20 - 3.50%      
Debt Instrument [Line Items]      
Term borrowings 491,268,000 [3] 0  
FT Real Estate Securities Company, Inc. [Member] | Cumulative Preferred | Debt Insturment Maturity Date - 3/31/31 - 9.50%      
Debt Instrument [Line Items]      
Term borrowings [2] 45,964,000 45,896,000  
First Horizon ABS Trusts [Member] | Collateralized By Loans [Member] | Debt Insturment Maturity Date - 10/25/34      
Debt Instrument [Line Items]      
Term borrowings [5] 41,100,000 65,612,000  
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  
[1] December 31, 2015 includes $29.7 million of held-to-maturity consumer mortgage loans secured by residential real estate in process of foreclosure.
[2] A portion q ualifies for total capital under the risk-based capital guidelines.
[3] Changes in the fair value of debt attributable to interest rate risk are hedged. Refer to Note 22 – Derivatives.
[4] Secured by trust preferred loans.
[5] On December 31, 2015 and 2014, borrowings secured by $52.8 million and $76.8 million, respectively, of residential real estate loans.