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Term Borrowings (Schedule Of Information Pertaining To Term Borrowings) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]      
Term borrowings $ 1,040,656 $ 1,312,677  
Loans, net of unearned income 19,589,520 [1] 17,686,502 [1] $ 16,230,166
Retail Real Estate Residential [Member]      
Debt Instrument [Line Items]      
Loans, net of unearned income $ 35,900 $ 52,800  
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 1.26% 0.81%  
Debt Instrument Maturity Date - 8/2/18 - 0.00%      
Debt Instrument [Line Items]      
Debt instrument maturity date Aug. 02, 2018    
Debt instrument interest rate 0.00%    
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 - 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 0.93% 0.59%  
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 - 4/1/16 - 5.65%      
Debt Instrument [Line Items]      
Term borrowings [2],[3] $ 0 $ 252,848  
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] 399,384 400,567  
First Tennessee Bank National Association [Member] | Federal Home Loan Bank Borrowings | Debt Instrument Maturity Date - 8/2/18 - 0.00%      
Debt Instrument [Line Items]      
Term borrowings 100 0  
First Tennessee Bank National Association [Member] | Collateralized By Loans [Member] | Debt Instrument Maturity Date - 12/22/2037      
Debt Instrument [Line Items]      
Term borrowings [4] 64,812 64,365  
First Horizon National Corporation | Senior capital notes | Debt Instrument Maturity Date - 12/15/20 - 3.50%      
Debt Instrument [Line Items]      
Term borrowings [3] 489,202 489,833  
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] 46,032 45,964  
First Horizon ABS Trusts [Member] | Collateralized By Loans [Member] | Debt Insturment Maturity Date - 10/25/34      
Debt Instrument [Line Items]      
Term borrowings [5] 23,126 41,100  
First Tennessee New Market Corporation Investments [Member] | Debt Instrument Maturity Date - 10/25/18 - 4.97%      
Debt Instrument [Line Items]      
Term borrowings 7,301 7,301  
First Tennessee New Market Corporation Investments [Member] | Debt Instrument Maturity Date - 2/1/33 - 4.97%      
Debt Instrument [Line Items]      
Term borrowings 8,000 8,000  
First Tennessee New Market Corporation Investments [Member] | Debt Instrument Maturity Date - 8/8/36 - 2.38%      
Debt Instrument [Line Items]      
Term borrowings $ 2,699 $ 2,699  
[1]

December 31, 2016 and 2015 include $28.5 million and $29. 7 million, respectively, of held-to-maturity consumer mortgage loans secured by residential real estate in process of foreclosure.

[2]

A portion q ualifie s 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 De cember 31, 2016 and 2015, borrowings secured by $35.9 million and $52.8 million, respectively, of residential real estate loans.