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Investment Securities (Schedule Of FHN's Investment Securities) (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Securities available for sale, Amortized Cost | $ 3,969,657 | $ 3,971,435
Securities available for sale, Gross Unrealized Gains |  | 19,869
Securities available for sale, Gross Unrealized Losses |  | (47,805)
Securities available-for-sale | 3,963,138 | 3,943,499
Pledged available for sale securities | 3,300,000 | 3,300,000
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities held to maturity, Amortized cost | 10,000 | 14,347
Securities held to maturity, Gross Unrealized Gains | 0 | 426
Securities held to maturity, Gross Unrealized Losses | (15) | 0
Held-to-maturity Securities, Fair Value | 9,985 | 14,773
FRB |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Restricted investments | 68,600 | 68,600
FHLB-Cincinnati Stock |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Restricted investments | 87,900 | 87,900
SBA - Interest Only Strips |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities available-for-sale | 3,123 |
States And Municipalities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities held to maturity, Amortized cost |  | 4,347
Securities held to maturity, Gross Unrealized Gains |  | 393
Securities held to maturity, Gross Unrealized Losses |  | 0
Held-to-maturity Securities, Fair Value |  | 4,740
Corporate Bonds |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities held to maturity, Amortized cost | 10,000 | 10,000
Securities held to maturity, Gross Unrealized Gains | 0 | 33
Securities held to maturity, Gross Unrealized Losses | (15) | 0
Held-to-maturity Securities, Fair Value | 9,985 | 10,033
U.S. treasuries |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities available for sale, Amortized Cost | 100 | 100
Securities available for sale, Gross Unrealized Gains | 0 | 0
Securities available for sale, Gross Unrealized Losses | 0 | 0
Securities available-for-sale | 100 | 100
Government Agency Issued Mortgage-Backed Securities ("MBS") |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities available for sale, Amortized Cost | 2,081,677 | 2,217,593
Securities available for sale, Gross Unrealized Gains | 15,993 | 14,960
Securities available for sale, Gross Unrealized Losses | (10,165) | (23,866)
Securities available-for-sale | 2,087,505 | 2,208,687
Government Agency Issued Collateralized Mortgage Obligations ("CMO") |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities available for sale, Amortized Cost | 1,701,467 | 1,566,986
Securities available for sale, Gross Unrealized Gains | 4,295 | 4,909
Securities available for sale, Gross Unrealized Losses | (19,767) | (23,937)
Securities available-for-sale | 1,685,995 | 1,547,958
Equity and other |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities available for sale, Amortized Cost | 186,413 | 186,756
Securities available for sale, Gross Unrealized Gains | 2 | 0
Securities available for sale, Gross Unrealized Losses | 0 | (2)
Securities available-for-sale | 186,415 | $ 186,754
Schedule of Held-to-maturity Securities [Line Items] |  |
Securities held to maturity, Amortized cost | 0 |
Held-to-maturity Securities, Fair Value | 0 |
Securities available-for-sale, excluding interest only strip: |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Securities available for sale, Amortized Cost | 3,969,657 |
Securities available for sale, Gross Unrealized Gains | 20,290 |
Securities available for sale, Gross Unrealized Losses | (29,932) |
Securities available-for-sale | $ 3,960,015 |

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