Variable Interest Entities (Summary Of VIE Consolidated By FHN) (Details) - USD ($) $ in Thousands	Mar. 31, 2017		Dec. 31, 2016		Mar. 31, 2016	Dec. 31, 2015
Assets:
Cash and due from banks	$ 369,290		$ 373,274
Loans, net of unearned income	19,090,074	[1]	19,589,520	[1]	$ 17,574,994
Allowance for loan losses	201,968		202,068		$ 204,034	$ 210,242
Total net loans	18,888,106		19,387,452
Other assets	1,378,260		1,406,711
Total assets	29,618,600		28,555,231
Liabilities:
Term borrowings	1,035,036		1,040,656
Other liabilities	401,997		467,944
Total liabilities	26,878,140		25,850,147
On Balance Sheet Consumer Loan Securitizations [Member]
Assets:
Cash and due from banks	0		0
Loans, net of unearned income	32,486		35,873
Allowance for loan losses	244		587
Total net loans	32,242		35,286
Other assets	150		283
Total assets	32,392		35,569
Liabilities:
Term borrowings	19,819		23,126
Other liabilities	3		3
Total liabilities	19,822		23,129
Rabbi Trusts Used For Deferred Compensation Plans [Member]
Assets:
Other assets	76,149		74,160
Total assets	76,149		74,160
Liabilities:
Other liabilities	57,559		54,746
Total liabilities	$ 57,559		$ 54,746

[1] March 31, 2017 and December 31, 2016 include $30.3 million and $28.5 million, respectively, of held-to-maturity consumer mortgage loans se cured by residential real estate properties in process of foreclosure.