Variable Interest Entities (Summary Of VIE Consolidated By FHN) (Details) - USD ($) $ in Thousands		Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014
Assets:
Cash and due from banks		$ 283,648		$ 300,811	$ 274,256
Loans, net of unearned income	[1]	18,589,337		17,686,502	16,936,772
Allowance for loan losses		199,807	$ 204,034	210,242	221,351	$ 228,328	$ 232,448
Total net loans		18,389,530		17,476,260	16,715,421
Other assets		1,387,756		1,436,291	1,405,961
Total assets		27,541,070		26,192,637	25,237,392
Liabilities:
Term borrowings		1,076,943		1,312,677	1,555,272
Other liabilities		588,636		635,306	574,090
Total liabilities		24,849,146		$ 23,553,051	22,719,487
On Balance Sheet Consumer Loan Securitizations [Member]
Assets:
Cash and due from banks		396			1,382
Loans, net of unearned income		43,479			66,444
Allowance for loan losses		453			214
Total net loans		43,026			66,230
Other assets		241			184
Total assets		43,663			67,796
Liabilities:
Term borrowings		30,956			55,679
Other liabilities		2			3
Total liabilities		30,958			55,682
Rabbi Trusts Used For Deferred Compensation Plans [Member]
Assets:
Other assets		71,923			69,077
Total assets		71,923			69,077
Liabilities:
Other liabilities		53,000			51,861
Total liabilities		$ 53,000			$ 51,861

[1] June 30 , 2016 and 2015 and December 31, 2015 include $31.1 million, $28.3 million and $29.7 million, respectively, of held-to-maturity consumer mortgage loans secured by residential real estate properties in process of f oreclosure.