Variable Interest Entities (Summary Of VIE Consolidated By FHN) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2012
Assets:
Cash and due from banks	$ 450,270	$ 349,216	$ 275,262
Loans, net of unearned income	15,119,461	15,389,074	15,889,670
Allowance for loan losses	247,246	253,809	265,218	276,963
Total net loans	14,872,215	15,135,265	15,624,452
Other assets	1,430,170	1,685,384	1,663,092
Total assets (Restricted - $.1 billion on March 31, 2014; March 31, 2013; and December 31, 2013)	23,941,989	23,789,833	24,803,048
Liabilities:
Term borrowings	1,507,048	1,739,859	2,197,864
Other liabilities	621,948	603,898	685,153
Total liabilities (Restricted - $.1 billion on March 31, 2014; March 31, 2013; and December 31, 2013)	21,397,852	21,289,082	22,203,321
On Balance Sheet Consumer Loan Securitizations [Member]
Assets:
Cash and due from banks	0		243
Loans, net of unearned income	86,685		114,505
Allowance for loan losses	1,954		3,712
Total net loans	84,731		110,793
Other assets	888		1,647
Total assets (Restricted - $.1 billion on March 31, 2014; March 31, 2013; and December 31, 2013)	85,619		112,683
Liabilities:
Term borrowings	77,119		104,875
Other liabilities	5		24
Total liabilities (Restricted - $.1 billion on March 31, 2014; March 31, 2013; and December 31, 2013)	77,124		104,899
Rabbi Trusts Used For Deferred Compensation Plans [Member]
Assets:
Other assets	64,217		62,053
Total assets (Restricted - $.1 billion on March 31, 2014; March 31, 2013; and December 31, 2013)	64,217		62,053
Liabilities:
Other liabilities	50,423		49,720
Total liabilities (Restricted - $.1 billion on March 31, 2014; March 31, 2013; and December 31, 2013)	$ 50,423		$ 49,720