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, 2014	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013 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, 2013 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, 2013 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, 2013 Other Retained Interests [Member] Retained Interest [Member] Hedged Items [Member]	Sep. 30, 2013 Other Retained Interests [Member] Retained Interest [Member] Hedged Items [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Notional					$ 0	$ 0	$ 0	$ 0
Assets					0	0	0	0
Liabilities					0	0	0	0
Gains/(Losses)					159	(3,047)	1,305	(4,275)
Total MSR recognized by FHN	2,880	72,793	116,686	114,311					114,318	114,318
Fair value of retained interests	1,338,022	801,718	1,343,134								15,714	15,714
Gains/(Losses)									$ 9,844	$ 20,174	$ 1,628	$ 3,422