Variable Interest Entities (Summary Of VIE Consolidated By FHN) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Jun. 30, 2013		Mar. 31, 2013	Dec. 31, 2012
Assets:
Cash and due from banks	$ 417,108		$ 349,216	$ 382,601
Loans, net of unearned income	15,795,709		15,389,074	16,197,952	[1]
Allowance for loan losses	243,628	247,246	253,809	261,934		265,218	276,963
Total net loans	15,552,081		15,135,265	15,936,018	[1]
Other assets	1,372,040		1,685,384	1,605,344	[1]
Total assets (Restricted - $.1 billion on June 30, 2014; June 30, 2013; and December 31, 2013)	24,222,750		23,789,833	24,852,800	[1]
Liabilities:
Term borrowings	1,501,209		1,739,859	1,800,255
Other liabilities	501,423		603,898	585,245	[1]
Total liabilities (Restricted - $.1 billion on June 30, 2014; June 30, 2013; and December 31, 2013)	21,596,599		21,289,082	22,306,392	[1]
On Balance Sheet Consumer Loan Securitizations [Member]
Assets:
Cash and due from banks	0			1,206
Loans, net of unearned income	84,381			109,222
Allowance for loan losses	725			3,839
Total net loans	83,656			105,383
Other assets	410			1,687
Total assets (Restricted - $.1 billion on June 30, 2014; June 30, 2013; and December 31, 2013)	84,066			108,276
Liabilities:
Term borrowings	74,103			99,487
Other liabilities	4			21
Total liabilities (Restricted - $.1 billion on June 30, 2014; June 30, 2013; and December 31, 2013)	74,107			99,508
Rabbi Trusts Used For Deferred Compensation Plans [Member]
Assets:
Other assets	66,360			61,447
Total assets (Restricted - $.1 billion on June 30, 2014; June 30, 2013; and December 31, 2013)	66,360			61,447
Liabilities:
Other liabilities	50,816			47,507
Total liabilities (Restricted - $.1 billion on June 30, 2014; June 30, 2013; and December 31, 2013)	$ 50,816			$ 47,507

[1] June 30, 2013 balance has been re-presented due to purchase accounting adjustments made in third quarter 2013.