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Preferred Stock And Other Capital (Details) (USD $)
 12 Months Ended 0 Months Ended 3 Months Ended 0 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Jan. 02, 2011
Fhn [Member]
Dec. 22, 2010
Fhn [Member]
Jan. 02, 2011
Fixed Rate Cumulative Perpetual Preferred Stock [Member]
Fhn [Member]
Dec. 31, 2008
Fixed Rate Cumulative Perpetual Preferred Stock [Member]
Fhn [Member]
Dec. 31, 2012
Class A Preferred Stock [Member]
First Tennessee Bank National Association [Member]
Dec. 31, 2011
Class A Preferred Stock [Member]
First Tennessee Bank National Association [Member]
Dec. 31, 2010
Class A Preferred Stock [Member]
First Tennessee Bank National Association [Member]
Dec. 31, 2005
Class A Preferred Stock [Member]
First Tennessee Bank National Association [Member]
Jan. 02, 2013
Class A Preferred Stock [Member]
First Horizon Preferred Funding III Inc [Member]
Dec. 31, 2000
Class B Preferred Stock [Member]
FT Real Estate Securities Company, Inc. [Member]
Dec. 31, 2000
Class B Preferred Stock [Member]
Noncontrolling Interest [Member]
Jan. 31, 2013
Series A Preferred Stock [Member]
Dec. 31, 2005
Series A Preferred Stock [Member]
First Tennessee Bank National Association [Member]
Preferred Units [Line Items]                                
Warrant issued to purchase common shares       14,842,321                        
Warrant adjustment due to stock dividend to cover common shares per share       8.757                        
Common equity and senior debt offerings         $ 750,000,000                      
Common stock warrant repurchased-CPP 79,700,000                              
Stock dividend distributed through date           January 1, 2011                    
Percentage of cumulative preferred stock                         9.50%   6.20%  
Liquidation preference per share                     $ 1,000   $ 1,000,000      
Noncontrolling interest, subsidiary preferred stock 300,000 300,000 300,000         294,800,000 294,800,000 294,800,000            
Preferred stock issued                             100,000,000  
Stock Issued During Period Shares New Issues             866,540           50 47 1,000 300,000
Debt Instrument Due Date                         March 31, 2031      
Stock Issued During Period Value New Issues   $ 263,103,000                   $ 100,000