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Investment Securities (Schedule of FHN's Investment Securities ) (Details) (USD $) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2014 | Mar. 31, 2013 | Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Securities available for sale, Amortized Cost | $ 3,574,144,000 | [1] | $ 3,110,692,000 | [2] |
Securities available for sale, Gross Unrealized Gains | 48,433,000 | [1] | 80,918,000 | [2] |
Securities available for sale, Gross Unrealized Losses | (51,398,000) | [1] | (1,391,000) | [2] |
Securities available-for-sale | 3,571,179,000 | [1] | 3,190,219,000 | [2] | 3,398,457,000
Pledged available for sale securities | 3,300,000,000 |  | 2,900,000,000 |  |
Schedule Of Held To Maturity Securities [Line Items] |  |  |  |  |
Securities held to maturity, Amortized cost | 4,274,000 |  | 0 |  | 0
Securities held to maturity, Gross Unrealized Gains | 1,180,000 |  |  |  |
Securities held to maturity, Gross Unrealized Losses | 0 |  |  |  |
Securities held to maturity, Fair Value | 5,454,000 |  |  |  |
States And Municipalities [Member] |  |  |  |  |
Schedule Of Held To Maturity Securities [Line Items] |  |  |  |  |
Securities held to maturity, Amortized cost | 4,274,000 |  |  |  |
Securities held to maturity, Gross Unrealized Gains | 1,180,000 |  |  |  |
Securities held to maturity, Gross Unrealized Losses | 0 |  |  |  |
Securities held to maturity, Fair Value | 5,454,000 |  |  |  |
FRB [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Restricted investments | 66,000,000 |  | 66,000,000 |  |
FHLB-Cincinnati Stock [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Restricted investments | 87,900,000 |  | 125,500,000 |  |
U.S. treasuries [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Securities available for sale, Amortized Cost | 39,989,000 |  | 39,992,000 |  |
Securities available for sale, Gross Unrealized Gains | 1,000 |  | 2,000 |  |
Securities available for sale, Gross Unrealized Losses | 0 |  | 0 |  |
Securities available-for-sale | 39,990,000 |  | 39,994,000 |  |
Government Agency Issued Mortgage-Backed Securities ("MBS") [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Securities available for sale, Amortized Cost | 762,069,000 |  | 1,009,283,000 |  |
Securities available for sale, Gross Unrealized Gains | 34,332,000 |  | 56,649,000 |  |
Securities available for sale, Gross Unrealized Losses | (3,839,000) |  | (381,000) |  |
Securities available-for-sale | 792,562,000 |  | 1,065,551,000 |  |
Government Agency Issued Collateralized Mortgage Obligations ("CMO") [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Securities available for sale, Amortized Cost | 2,565,310,000 |  | 1,826,314,000 |  |
Securities available for sale, Gross Unrealized Gains | 13,996,000 |  | 24,049,000 |  |
Securities available for sale, Gross Unrealized Losses | (47,536,000) |  | (1,010,000) |  |
Securities available-for-sale | 2,531,770,000 |  | 1,849,353,000 |  |
Other U.S. Government Agencies [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Securities available for sale, Amortized Cost | 2,078,000 |  | 3,068,000 |  |
Securities available for sale, Gross Unrealized Gains | 104,000 |  | 208,000 |  |
Securities available for sale, Gross Unrealized Losses | 0 |  | 0 |  |
Securities available-for-sale | 2,182,000 |  | 3,276,000 |  |
States And Municipalities [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Securities available for sale, Amortized Cost | 15,155,000 |  | 15,255,000 |  |
Securities available for sale, Gross Unrealized Gains | 0 |  | 0 |  |
Securities available for sale, Gross Unrealized Losses | 0 |  | 0 |  |
Securities available-for-sale | 15,155,000 |  | 15,255,000 |  |
Equity and other |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Securities available for sale, Amortized Cost | 189,543,000 | [3] | 216,780,000 | [4] |
Securities available for sale, Gross Unrealized Gains | 0 | [3] | 10,000 | [4] |
Securities available for sale, Gross Unrealized Losses | (23,000) | [3] | 0 | [4] |
Securities available-for-sale | 189,520,000 | [3] | 216,790,000 | [4] |
Schedule Of Held To Maturity Securities [Line Items] |  |  |  |  |
Securities held to maturity, Amortized cost | 0 |  |  |  |
Securities held to maturity, Fair Value | $ 0 |  |  |  |
[1] | Includes $3.3 billion of securities pledged to secure public deposits, securities sold under agreements to repurchase, and for other purposes.
[2] | Includes $2.9 billion of securities pledged to secure public deposits, securities sold under agreements to repurchase, and for other purposes.
[3] | Includes restricted investments in FHLB-Cincinnati stock of $87.9 million and FRB stock of $66.0 million. The remainder is money market, venture capital, and cost method investments.
[4] | Includes restricted investments in FHLB-Cincinnati stock of $125.5 million and FRB stock of $66.0 million. The remainder is money market, venture capital, and cost method investments.

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