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Investment Securities - Schedule Of FHN's Investment Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Debt securities, available-for-sale: |  |
Amortized Cost | $ 4,717,181 |
Securities available for sale, fair value | 4,626,470 | $ 5,170,255
Fair Value |  | 5,170,255
Securities held-to-maturity: |  |
Amortized Cost | 10,000 | 10,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (157) | (99)
Fair Value | 9,843 | 9,901
Securities pledged and sold | 3,800,000 | 4,000,000
FHLB-Cincinnati Stock |  |
Securities held-to-maturity: |  |
Restricted Investments |  | 87,900
FRB |  |
Securities held-to-maturity: |  |
Restricted Investments |  | 134,600
U.S. treasuries |  |
Debt securities, available-for-sale: |  |
Amortized Cost | 100 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (2) |
Securities available for sale, fair value | 98 |
Amortized Cost |  | 100
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | (1)
Fair Value |  | 99
Government agency issued mortgage-backed securities (“MBS”) |  |
Debt securities, available-for-sale: |  |
Amortized Cost | 2,473,687 |
Gross Unrealized Gains | 4,819 |
Gross Unrealized Losses | (58,400) |
Securities available for sale, fair value | 2,420,106 |
Amortized Cost |  | 2,580,442
Gross Unrealized Gains |  | 10,538
Gross Unrealized Losses |  | (13,604)
Fair Value |  | 2,577,376
Government agency issued collateralized mortgage obligations (“CMO”) |  |
Debt securities, available-for-sale: |  |
Amortized Cost | 2,006,488 |
Gross Unrealized Gains | 888 |
Gross Unrealized Losses | (48,681) |
Securities available for sale, fair value | 1,958,695 |
Amortized Cost |  | 2,302,439
Gross Unrealized Gains |  | 1,691
Gross Unrealized Losses |  | (34,272)
Fair Value |  | 2,269,858
Other U.S. government agencies |  |
Debt securities, available-for-sale: |  |
Amortized Cost | 149,050 |
Gross Unrealized Gains | 809 |
Gross Unrealized Losses | (73) |
Securities available for sale, fair value | 149,786 |
Corporates and other debt |  |
Debt securities, available-for-sale: |  |
Amortized Cost | 55,383 |
Gross Unrealized Gains | 388 |
Gross Unrealized Losses | (461) |
Securities available for sale, fair value | 55,310 |
Amortized Cost |  | 55,799
Gross Unrealized Gains |  | 23
Gross Unrealized Losses |  | (40)
Fair Value |  | 55,782
State and municipalities |  |
Debt securities, available-for-sale: |  |
Amortized Cost | 32,473 |
Gross Unrealized Gains | 314 |
Gross Unrealized Losses | (214) |
Securities available for sale, fair value | 32,573 |
Equity and other |  |
Debt securities, available-for-sale: |  |
Amortized Cost |  | 265,863
Gross Unrealized Gains |  | 7
Gross Unrealized Losses |  | 0
Fair Value |  | 265,870
Available-for-sale securities, excluding interest only strips |  |
Debt securities, available-for-sale: |  |
Amortized Cost | 4,717,181 |
Gross Unrealized Gains | 7,218 |
Gross Unrealized Losses | (107,831) |
Securities available for sale, fair value | 4,616,568 |
Amortized Cost |  | 5,204,643
Gross Unrealized Gains |  | 12,259
Gross Unrealized Losses |  | (47,917)
Fair Value |  | 5,168,985
SBA - interest only strips |  |
Debt securities, available-for-sale: |  |
Securities available for sale, fair value | 9,902 |
Fair Value |  | 1,270
Corporates and other debt |  |
Securities held-to-maturity: |  |
Amortized Cost | 10,000 | 10,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (157) | (99)
Fair Value | $ 9,843 | $ 9,901

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