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Investment Securities (Schedule Of FHN's Investment Securities) (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]      
Securities available for sale, Amortized Cost $ 3,914,243 [1] $ 3,622,145 [2]  
Securities available for sale, Gross Unrealized Gains 96,298 [1] 49,925 [2]  
Securities available for sale, Gross Unrealized Losses (1,298) [1] (23,210) [2]  
Securities available for sale, Fair Value 4,009,243 [1] 3,648,860 [2] $ 3,929,846
Pledged available for sale securities 3,400,000 3,200,000  
Schedule Of Held To Maturity Securities [Line Items]      
Securities held to maturity, Amortized cost 14,333 4,306 $ 14,320
Securities held to maturity, Gross Unrealized Gains 768 1,050  
Securities held to maturity, Gross Unrealized Losses 0 0  
Securities held to maturity, Fair Value 15,101 5,356  
FRB [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Restricted investments 68,600 65,800  
FHLB-Cincinnati Stock [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Restricted investments 87,900 87,900  
U.S. treasuries      
Schedule of Available-for-sale Securities [Line Items]      
Securities available for sale, Amortized Cost 100 100  
Securities available for sale, Gross Unrealized Gains 0 0  
Securities available for sale, Gross Unrealized Losses 0 0  
Securities available for sale, Fair Value 100 100  
Government Agency Issued Mortgage-Backed Securities ("MBS")      
Schedule of Available-for-sale Securities [Line Items]      
Securities available for sale, Amortized Cost 1,880,831 804,841  
Securities available for sale, Gross Unrealized Gains 65,391 29,068  
Securities available for sale, Gross Unrealized Losses 0 (3,269)  
Securities available for sale, Fair Value 1,946,222 830,640  
Government Agency Issued Collateralized Mortgage Obligations ("CMO")      
Schedule of Available-for-sale Securities [Line Items]      
Securities available for sale, Amortized Cost 1,845,205 2,624,151  
Securities available for sale, Gross Unrealized Gains 30,907 20,836  
Securities available for sale, Gross Unrealized Losses (1,296) (19,701)  
Securities available for sale, Fair Value 1,874,816 2,625,286  
Other U.S. Government Agencies      
Schedule of Available-for-sale Securities [Line Items]      
Securities available for sale, Amortized Cost   1,539  
Securities available for sale, Gross Unrealized Gains   21  
Securities available for sale, Gross Unrealized Losses   0  
Securities available for sale, Fair Value   1,560  
States And Municipalities      
Schedule of Available-for-sale Securities [Line Items]      
Securities available for sale, Amortized Cost 1,500 9,455  
Securities available for sale, Gross Unrealized Gains 0 0  
Securities available for sale, Gross Unrealized Losses 0 0  
Securities available for sale, Fair Value 1,500 9,455  
Equity and other      
Schedule of Available-for-sale Securities [Line Items]      
Securities available for sale, Amortized Cost 186,607 [3] 182,059 [4]  
Securities available for sale, Gross Unrealized Gains 0 [3] 0 [4]  
Securities available for sale, Gross Unrealized Losses (2) [3] (240) [4]  
Securities available for sale, Fair Value 186,605 [3] 181,819 [4]  
Schedule Of Held To Maturity Securities [Line Items]      
Securities held to maturity, Amortized cost 0    
Securities held to maturity, Fair Value 0    
States And Municipalities      
Schedule Of Held To Maturity Securities [Line Items]      
Securities held to maturity, Amortized cost 4,333 4,306  
Securities held to maturity, Gross Unrealized Gains 407 1,050  
Securities held to maturity, Gross Unrealized Losses 0 0  
Securities held to maturity, Fair Value 4,740 $ 5,356  
Corporate Bonds      
Schedule Of Held To Maturity Securities [Line Items]      
Securities held to maturity, Amortized cost 10,000    
Securities held to maturity, Gross Unrealized Gains 361    
Securities held to maturity, Gross Unrealized Losses 0    
Securities held to maturity, Fair Value $ 10,361    
[1] Includes $ 3 . 4 billion of securities pledged to secure public deposits, securities sold under agreements to repurchase, and for other purposes.
[2] Includes $ 3.2 billion of securities pledged to secure public deposits, securities sold under agreements to repu rchase, and for other purposes .
[3] Includes restricted investments in FHLB-Cincinnati stock of $ 87.9 million and FRB stock of $ 68 .6 million. The remainder is money market and cost method investments.
[4] Includes restricted investments in FHLB-Cincinnati stock of $ 87.9 million and FRB stock of $ 65 .8 million. The remainder is money market and cost method investments.