Variable Interest Entities (Summary Of VIE Consolidated By FHN) (Details) - USD ($)	Jun. 30, 2015		Mar. 31, 2015	Dec. 31, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013
Assets:
Cash and due from banks	$ 274,256,000			$ 349,171,000	$ 417,108,000
Loans, net of unearned income	16,936,772,000	[1]		16,230,166,000	15,795,709,000
Allowance for loan losses	221,351,000		$ 228,328,000	232,448,000	243,628,000	$ 247,246,000	$ 253,809,000
Total net loans	16,715,421,000			15,997,718,000	15,552,081,000
Other assets	1,408,336,000			1,385,572,000	1,370,832,000
Total assets	25,239,767,000			25,668,187,000	24,218,345,000
Liabilities:
Term borrowings	1,557,647,000			1,880,105,000	1,501,209,000
Other liabilities	574,090,000			649,359,000	507,894,000
Total liabilities	22,721,862,000			$ 23,086,597,000	21,603,070,000
On Balance Sheet Consumer Loan Securitizations [Member]
Assets:
Cash and due from banks	1,382,000				0
Loans, net of unearned income	66,444,000				84,381,000
Allowance for loan losses	214,000				725,000
Total net loans	66,230,000				83,656,000
Other assets	184,000				410,000
Total assets	67,796,000				84,066,000
Liabilities:
Term borrowings	55,679,000				74,103,000
Other liabilities	3,000				4,000
Total liabilities	55,682,000				74,107,000
Rabbi Trusts Used For Deferred Compensation Plans [Member]
Assets:
Other assets	69,077,000				66,360,000
Total assets	69,077,000				66,360,000
Liabilities:
Other liabilities	51,861,000				50,816,000
Total liabilities	$ 51,861,000				$ 50,816,000

[1] June 30, 2015 includes $28.3 million of held-to-maturity consumer mortgage loans secured by residential real estate in process of foreclosure.