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Investment Securities (Schedule Of FHN's Investment Securities) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 | Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Securities available for sale, Amortized Cost | $ 3,969,748 | [1] | $ 3,971,435 | [2]
Securities available for sale, Gross Unrealized Gains | 18,655 | [1] | 19,869 | [2]
Securities available for sale, Gross Unrealized Losses | (49,125) | [1] | (47,805) | [2]
Securities available for sale, Fair Value | 3,939,278 | [1] | 3,943,499 | [2]
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 | 14,354 |  | 14,347 |
Securities held to maturity, Gross Unrealized Gains | 449 |  | 426 |
Securities held to maturity, Gross Unrealized Losses | 0 |  | 0 |
Securities held to maturity, Fair Value | 14,803 |  | 14,773 |
FRB [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Restricted investments | 68,600 |  | 68,600 |
FHLB-Cincinnati Stock [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Restricted investments | 87,900 |  | 87,900 |
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, Fair Value | 100 |  | 100 |
Government Agency Issued Mortgage-Backed Securities ("MBS") |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Securities available for sale, Amortized Cost | 2,171,843 |  | 2,217,593 |
Securities available for sale, Gross Unrealized Gains | 13,675 |  | 14,960 |
Securities available for sale, Gross Unrealized Losses | (25,596) |  | (23,866) |
Securities available for sale, Fair Value | 2,159,922 |  | 2,208,687 |
Government Agency Issued Collateralized Mortgage Obligations ("CMO") |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Securities available for sale, Amortized Cost | 1,610,857 |  | 1,566,986 |
Securities available for sale, Gross Unrealized Gains | 4,980 |  | 4,909 |
Securities available for sale, Gross Unrealized Losses | (23,526) |  | (23,937) |
Securities available for sale, Fair Value | 1,592,311 |  | 1,547,958 |
Equity and other |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Securities available for sale, Amortized Cost | 186,948 | [3] | 186,756 | [4]
Securities available for sale, Gross Unrealized Gains | 0 | [3] | 0 | [4]
Securities available for sale, Gross Unrealized Losses | (3) | [3] | (2) | [4]
Securities available for sale, Fair Value | 186,945 | [3] | 186,754 | [4]
Schedule Of Held To Maturity Securities [Line Items] |  |  |  |
Securities held to maturity, Amortized cost | 0 |  |  |
Securities held to maturity, Fair Value | 0 |  |  |
States And Municipalities |  |  |  |
Schedule Of Held To Maturity Securities [Line Items] |  |  |  |
Securities held to maturity, Amortized cost | 4,354 |  | 4,347 |
Securities held to maturity, Gross Unrealized Gains | 386 |  | 393 |
Securities held to maturity, Gross Unrealized Losses | 0 |  | 0 |
Securities held to maturity, Fair Value | 4,740 |  | 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 | 63 |  | 33 |
Securities held to maturity, Gross Unrealized Losses | 0 |  | 0 |
Securities held to maturity, Fair Value | $ 10,063 |  | $ 10,033 |
[1] | Includes $ 3 . 5 billion of securities pledged to secure public deposits, securities sold under agreements to repurchase, and for other purposes.
[2] | Includes $ 3.3 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 $ 68.6 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 $ 68.6 million. The remainder is money market , mutual funds, and cost method investments.

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