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Investment Securities (Schedule Of FHN's Investment Securities) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 5,204,643 | $ 3,971,435
Gross Unrealized Gains |  | 19,869
Gross Unrealized Losses |  | (47,805)
Fair Value | 5,170,255 | 3,943,499
Pledged available for sale securities | 4,000,000 | 3,300,000
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 10,000 | 14,347
Gross Unrealized Gains | 0 | 426
Gross Unrealized Losses | (99) | 0
Fair Value | 9,901 | 14,773
FRB |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Restricted investments | 134,600 | 68,600
FHLB-Cincinnati Stock |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Restricted investments | 87,900 | 87,900
States and municipalities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost |  | 4,347
Gross Unrealized Gains |  | 393
Gross Unrealized Losses |  | 0
Fair Value |  | 4,740
Corporates and other debt |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 10,000 | 10,000
Gross Unrealized Gains | 0 | 33
Gross Unrealized Losses | (99) | 0
Fair Value | 9,901 | 10,033
Securities available-for-sale, excluding interest only strip: |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 5,204,643 |
Gross Unrealized Gains | 12,259 |
Gross Unrealized Losses | (47,917) |
Fair Value | 5,168,985 |
U.S. treasuries |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 100 | 100
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (1) | 0
Fair Value | 99 | 100
Government agency issued mortgage-backed securities (“MBS”) |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 2,580,442 | 2,217,593
Gross Unrealized Gains | 10,538 | 14,960
Gross Unrealized Losses | (13,604) | (23,866)
Fair Value | 2,577,376 | 2,208,687
Government agency issued collateralized mortgage obligations (“CMO”) |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 2,302,439 | 1,566,986
Gross Unrealized Gains | 1,691 | 4,909
Gross Unrealized Losses | (34,272) | (23,937)
Fair Value | 2,269,858 | 1,547,958
Corporates and other debt |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 55,799 |
Gross Unrealized Gains | 23 |
Gross Unrealized Losses | (40) |
Fair Value | 55,782 |
Equity and other |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 265,863 | 186,756
Gross Unrealized Gains | 7 | 0
Gross Unrealized Losses | 0 | (2)
Fair Value | 265,870 | $ 186,754
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 0 |
Fair Value | 0 |
SBA - Interest Only Strips |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | $ 1,270 |

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