Securities Purchased Under Agreements To Resell And Collateral Pledged By Company (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013
Securities Purchased under Agreements to Resell [Abstract]
Gross amounts of recognized assets	$ 624,477		$ 602,126
Gross amounts offset in the Statement of Condition	0		0
Net amounts of assets presented in the Statement of Condition	624,477	412,614	602,126
Offsetting securities sold under agreements to repurchase	(61,094)		(3,455)
Securities collateral (not recognized on FHN's Statement of Condition)	(555,665)		(589,180)
Net amount	$ 7,718		$ 9,491