Variable Interest Entities (Summary Of VIE Consolidated By FHN) (Details) - USD ($) $ in Thousands		Sep. 30, 2016	Jun. 30, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Dec. 31, 2014
Assets:
Cash and due from banks		$ 327,639		$ 300,811	$ 256,342
Loans, net of unearned income	[1]	19,555,787		17,686,502	16,725,492
Allowance for loan losses		201,557	$ 199,807	210,242	210,814	$ 221,351	$ 232,448
Total net loans		19,354,230		17,476,260	16,514,678
Other assets		1,435,379		1,436,291	1,417,071
Total assets		28,449,222		26,192,637	25,386,073
Liabilities:
Term borrowings		1,065,651		1,312,677	1,339,940
Other liabilities		475,839		635,306	622,586
Total liabilities		25,704,640		$ 23,553,051	22,805,828
On Balance Sheet Consumer Loan Securitizations [Member]
Assets:
Cash and due from banks		127			2,000
Loans, net of unearned income		38,519			59,258
Allowance for loan losses		588			54
Total net loans		37,931			59,204
Other assets		286			114
Total assets		38,344			61,318
Liabilities:
Term borrowings		26,062			48,491
Other liabilities		3			3
Total liabilities		26,065			48,494
Rabbi Trusts Used For Deferred Compensation Plans [Member]
Assets:
Other assets		72,916			66,490
Total assets		72,916			66,490
Liabilities:
Other liabilities		53,429			49,275
Total liabilities		$ 53,429			$ 49,275

[1] September 30 , 2016 and 2015 and December 31, 2015 include $30.3 million, $30.7 million and $29.7 million, respectively, of held-to-maturity consumer mortgage loans secured by residential real estate properties in pr ocess of foreclosure.