Derivatives (Derivatives associated with legacy Mortgage Servicing Activities) (Details) (USD $) In Thousands, unless otherwise specified					3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended
	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2013 Forwards And Futures [Member] Retained Interest [Member] Hedging Instruments [Member]	Jun. 30, 2012 Forwards And Futures [Member] Retained Interest [Member] Hedging Instruments [Member]	Jun. 30, 2013 Forwards And Futures [Member] Retained Interest [Member] Hedging Instruments [Member]	Jun. 30, 2012 Forwards And Futures [Member] Retained Interest [Member] Hedging Instruments [Member]	Jun. 30, 2013 Interest Rate Swaps And Swaptions [Member] Retained Interest [Member] Hedging Instruments [Member]	Jun. 30, 2012 Interest Rate Swaps And Swaptions [Member] Retained Interest [Member] Hedging Instruments [Member]	Jun. 30, 2013 Interest Rate Swaps And Swaptions [Member] Retained Interest [Member] Hedging Instruments [Member]	Jun. 30, 2012 Interest Rate Swaps And Swaptions [Member] Retained Interest [Member] Hedging Instruments [Member]	Jun. 30, 2013 Mortgage Servicing Rights [Member] Retained Interest [Member] Hedged Items [Member]	Jun. 30, 2012 Mortgage Servicing Rights [Member] Retained Interest [Member] Hedged Items [Member]	Jun. 30, 2013 Mortgage Servicing Rights [Member] Retained Interest [Member] Hedged Items [Member]	Jun. 30, 2012 Mortgage Servicing Rights [Member] Retained Interest [Member] Hedged Items [Member]	Jun. 30, 2013 Other Retained Interests [Member] Retained Interest [Member] Hedged Items [Member]	Jun. 30, 2012 Other Retained Interests [Member] Retained Interest [Member] Hedged Items [Member]	Jun. 30, 2013 Other Retained Interests [Member] Retained Interest [Member] Hedged Items [Member]	Jun. 30, 2012 Other Retained Interests [Member] Retained Interest [Member] Hedged Items [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Notional									$ 407,000	$ 2,136,600	$ 407,000	$ 2,136,600
Notional, Forwards and Futures					35,000	1,961,000	35,000	1,961,000
Assets									168	4,859	168	4,859
Assets, Forwards and Futures					92	18,712	92	18,712
Liabilities									3,376	18,330	3,376	18,330
Liabilities, Forwards and Futures					459	1,091	459	1,091
Gains/(Losses)									(6,314)	(3,466)	(5,580)	918
Gains/(Losses), Forwards and Futures					(2,795)	10,943	(3,206)	9,632
Total MSR recognized by FHN	113,853	114,311	129,291	144,069									111,207	126,164	111,207	126,164
Fair value of retained interests	1,267,348	1,262,720	1,361,717														15,872	20,567	15,872	20,567
Gains/(Losses)													$ 9,153	$ (4,131)	$ 10,330	$ 900	$ 1,313	$ (1,513)	$ 1,794	$ (553)