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Investment Securities (Schedule Of FHN's Investment Securities) (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2017 | Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Securities available for sale, Amortized Cost |  | $ 3,964,419 |  | $ 3,971,435 | [1]
Securities available for sale, Gross Unrealized Gains | [1] |  |  | 19,869 |
Securities available for sale, Gross Unrealized Losses | [1] |  |  | (47,805) |
Securities available-for-sale |  | 3,949,592 | [2] | 3,943,499 | [1]
Pledged available for sale securities |  | 3,500,000 |  | 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 |  | (9) |  | 0 |
Held-to-maturity Securities, Fair Value |  | 9,991 |  | 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] | 1,163 |  |  |
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 |  | (9) |  | 0 |
Held-to-maturity Securities, Fair Value |  | 9,991 |  | 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 |  | 2,130,894 |  | 2,217,593 |
Securities available for sale, Gross Unrealized Gains |  | 13,160 |  | 14,960 |
Securities available for sale, Gross Unrealized Losses |  | (14,438) |  | (23,866) |
Securities available-for-sale |  | 2,129,616 |  | 2,208,687 |
Government Agency Issued Collateralized Mortgage Obligations ("CMO") |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Securities available for sale, Amortized Cost |  | 1,646,533 |  | 1,566,986 |
Securities available for sale, Gross Unrealized Gains |  | 4,754 |  | 4,909 |
Securities available for sale, Gross Unrealized Losses |  | (19,464) |  | (23,937) |
Securities available-for-sale |  | 1,631,823 |  | 1,547,958 |
Equity and other |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Securities available for sale, Amortized Cost |  | 186,892 | [4] | 186,756 | [5]
Securities available for sale, Gross Unrealized Gains |  | 0 | [4] | 0 | [5]
Securities available for sale, Gross Unrealized Losses |  | (2) | [4] | (2) | [5]
Securities available-for-sale |  | 186,890 | [4] | $ 186,754 | [5]
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 |  | 3,964,419 |  |  |
Securities available for sale, Gross Unrealized Gains |  | 17,914 |  |  |
Securities available for sale, Gross Unrealized Losses |  | (33,904) |  |  |
Securities available-for-sale |  | $ 3,948,429 |  |  |
[1] | Includes $3.3 billion of securities pledged to secure public deposits, securities sold under agreements to repurchase, and for other purposes.
[2] | Includes $3.5 billion of securities pledged to secure public deposits, securities sold under agreements to repurchase, and for other purposes.
[3] | SBA-interest only strips are recorded at elected fair value. See Note 16 - Fair Value for additional information.
[4] | Includes restricted investments in FHLB-Cincinnati stock of $87.9 million and FRB stock of $68.6 million. The remainder is money market, mutual funds, and cost method investments.
[5] | Includes restricted investments in FHLB-Cincinnati stock of $87.9 million and FRB stock of $68.6 million. The remainder is money market, mutual funds, and cost method investments.

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