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Investment Securities (Schedule Of FHN's Investment Securities) (Details) - USD ($) | 9 Months Ended |
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Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Securities available for sale, Amortized Cost | $ 3,621,952,000 | [1] | $ 3,527,756,000 | [2] |
Securities available for sale, Gross Unrealized Gains | 62,057,000 | [1] | 49,527,000 | [2] |
Securities available for sale, Gross Unrealized Losses | (10,368,000) | [1] | (42,612,000) | [2] |
Securities available for sale | 3,673,641,000 | [1] | 3,534,671,000 | [2] | $ 3,556,613,000
Pledged available for sale securities | 2,900,000,000 |  | 3,200,000,000 |  |
Schedule Of Held To Maturity Securities [Line Items] |  |  |  |  |
Securities held to maturity, Amortized cost | 4,313,000 |  | 4,286,000 |  | $ 4,292,000
Securities held to maturity, Gross Unrealized Gains | 1,091,000 |  | 1,094,000 |  |
Securities held to maturity, Gross Unrealized Losses | 0 |  | 0 |  |
Securities held to maturity, Fair Value | 5,404,000 |  | 5,380,000 |  |
FRB [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Restricted investments | 65,800,000 |  | 66,000,000 |  |
FHLB-Cincinnati Stock [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Restricted investments | 87,900,000 |  | 87,900,000 |  |
U.S. treasuries |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Securities available for sale, Amortized Cost | 100,000 |  | 100,000 |  |
Securities available for sale, Gross Unrealized Gains | 0 |  | 0 |  |
Securities available for sale, Gross Unrealized Losses | 0 |  | 0 |  |
Securities available for sale | 100,000 |  | 100,000 |  |
Government Agency Issued Mortgage-Backed Securities ("MBS") |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Securities available for sale, Amortized Cost | 914,878,000 |  | 685,426,000 |  |
Securities available for sale, Gross Unrealized Gains | 31,773,000 |  | 33,820,000 |  |
Securities available for sale, Gross Unrealized Losses | (700,000) |  | (2,381,000) |  |
Securities available for sale | 945,951,000 |  | 716,865,000 |  |
Government Agency Issued Collateralized Mortgage Obligations ("CMO") |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Securities available for sale, Amortized Cost | 2,514,362,000 |  | 2,648,047,000 |  |
Securities available for sale, Gross Unrealized Gains | 30,281,000 |  | 15,637,000 |  |
Securities available for sale, Gross Unrealized Losses | (9,207,000) |  | (39,999,000) |  |
Securities available for sale | 2,535,436,000 |  | 2,623,685,000 |  |
Other U.S. Government Agencies |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Securities available for sale, Amortized Cost | 1,443,000 |  | 1,859,000 |  |
Securities available for sale, Gross Unrealized Gains | 3,000 |  | 70,000 |  |
Securities available for sale, Gross Unrealized Losses | 0 |  | 0 |  |
Securities available for sale | 1,446,000 |  | 1,929,000 |  |
U S States And Political Subdivisions [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Securities available for sale, Amortized Cost | 9,155,000 |  | 10,205,000 |  |
Securities available for sale, Gross Unrealized Gains | 0 |  | 0 |  |
Securities available for sale, Gross Unrealized Losses | 0 |  | 0 |  |
Securities available for sale | 9,155,000 |  | 10,205,000 |  |
Equity and other |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Securities available for sale, Amortized Cost | 182,014,000 | [3] | 182,119,000 | [4] |
Securities available for sale, Gross Unrealized Gains | 0 | [3] | 0 | [4] |
Securities available for sale, Gross Unrealized Losses | (461,000) | [3] | (232,000) | [4] |
Securities available for sale | 181,553,000 | [3] | 181,887,000 | [4] |
Schedule Of Held To Maturity Securities [Line Items] |  |  |  |  |
Securities held to maturity, Amortized cost | 0 |  |  |  |
Securities held to maturity, Fair Value | 0 |  |  |  |
U S States And Political Subdivisions [Member] |  |  |  |  |
Schedule Of Held To Maturity Securities [Line Items] |  |  |  |  |
Securities held to maturity, Amortized cost | 4,313,000 |  | 4,286,000 |  |
Securities held to maturity, Gross Unrealized Gains | 1,091,000 |  | 1,094,000 |  |
Securities held to maturity, Gross Unrealized Losses | 0 |  | 0 |  |
Securities held to maturity, Fair Value | $ 5,404,000 |  | $ 5,380,000 |  |
[1] | Includes $ 2.9 billion of securities pledged to secure public deposits, securities sold under agreements to repurchase, and for other purposes.
[2] | Includes $ 3.2 billion of securities pledged to secure public deposits, securities sold under agreements to repu rchase, and for other purposes .
[3] | Includes restricted investments in FHLB-Cincinnati stock of $ 87.9 million and FRB stock of $ 65.8 million. The remainder is money market , mutual funds, and cost method investments.
[4] | Includes restricted investments in FHLB-Cincinnati stock of $ 87.9 million and FRB stock of $ 66.0 million. The remainder is money market , mutual funds, and cost method investments.

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