Derivatives (Derivatives associated with legacy Mortgage Servicing Activities) (Details) (USD $) In Thousands, unless otherwise specified					3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2013 Forwards And Futures [Member] Retained Interest [Member] Hedging Instruments [Member]	Sep. 30, 2012 Forwards And Futures [Member] Retained Interest [Member] Hedging Instruments [Member]	Sep. 30, 2013 Forwards And Futures [Member] Retained Interest [Member] Hedging Instruments [Member]	Sep. 30, 2012 Forwards And Futures [Member] Retained Interest [Member] Hedging Instruments [Member]	Sep. 30, 2013 Interest Rate Swaps And Swaptions [Member] Retained Interest [Member] Hedging Instruments [Member]	Sep. 30, 2012 Interest Rate Swaps And Swaptions [Member] Retained Interest [Member] Hedging Instruments [Member]	Sep. 30, 2013 Interest Rate Swaps And Swaptions [Member] Retained Interest [Member] Hedging Instruments [Member]	Sep. 30, 2012 Interest Rate Swaps And Swaptions [Member] Retained Interest [Member] Hedging Instruments [Member]	Sep. 30, 2013 Mortgage Servicing Rights [Member] Retained Interest [Member] Hedged Items [Member]	Sep. 30, 2012 Mortgage Servicing Rights [Member] Retained Interest [Member] Hedged Items [Member]	Sep. 30, 2013 Mortgage Servicing Rights [Member] Retained Interest [Member] Hedged Items [Member]	Sep. 30, 2012 Mortgage Servicing Rights [Member] Retained Interest [Member] Hedged Items [Member]	Sep. 30, 2013 Other Retained Interests [Member] Retained Interest [Member] Hedged Items [Member]	Sep. 30, 2012 Other Retained Interests [Member] Retained Interest [Member] Hedged Items [Member]	Sep. 30, 2013 Other Retained Interests [Member] Retained Interest [Member] Hedged Items [Member]	Sep. 30, 2012 Other Retained Interests [Member] Retained Interest [Member] Hedged Items [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Notional					$ 0	$ 20,000	$ 0	$ 20,000	$ 0	$ 1,837,600	$ 0	$ 1,837,600
Assets									0	6,693	0	6,693
Assets, Forwards and Futures					0	542	0	542
Liabilities									0	4,282	0	4,282
Liabilities, Forwards and Futures					0	0	0	0
Gains/(Losses)									1,305	4,580	(4,275)	5,498
Gains/(Losses), Forwards and Futures					159	207	(3,047)	9,839
Total MSR recognized by FHN	116,686	114,311	120,537	144,069									114,318	117,522	114,318	117,522
Fair value of retained interests	1,343,134	1,262,720	1,204,366														15,714	19,201	15,714	19,201
Gains/(Losses)													$ 9,844	$ (1,279)	$ 20,174	$ (379)	$ 1,628	$ 978	$ 3,422	$ 425