Securities Purchased Under Agreements To Resell And Collateral Pledged By Counterparties (Details) - USD ($)	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014
Securities Purchased under Agreements to Resell [Abstract]
Gross amounts of recognized assets	$ 816,991,000		$ 624,477,000
Gross amounts offset in the Statement of Condition	0		0
Net amounts of assets presented in the Statement of Condition	816,991,000	$ 659,154,000	624,477,000
Offsetting securities sold under agreements to repurchase	(3,605,000)		(61,094,000)
Securities collateral (not recognized on FHN's Statement of Condition)	(805,178,000)		(555,665,000)
Net amount	$ 8,208,000		$ 7,718,000