Securities Purchased Under Agreements To Resell And Collateral Pledged By Company (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013
Securities Purchased under Agreements to Resell [Abstract]
Gross amounts of recognized assets	$ 605,276		$ 732,696
Gross amounts offset in the Statement of Condition	0		0
Net amounts of assets presented in the Statement of Condition	605,276	412,614	732,696
Offsetting securities sold under agreements to repurchase	(5,827)		(2,196)
Securities collateral (not recognized on FHN's Statement of Condition)	(591,273)		(723,195)
Net amount	$ 8,176		$ 7,305