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Investment Securities - Schedule Of FHN's Investment Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Debt securities, available-for-sale: |  |
Securities available for sale, amortized cost | $ 4,385,003 |
Securities available for sale, fair value | 4,445,403 | $ 4,626,470
Securities pledged and sold | 3,800,000 | 3,800,000
Securities held-to-maturity: |  |
Amortized Cost | 10,000 | 10,000
Securities held to maturity, gross unrealized gains | 1 | 0
Securities held to maturity, gross unrealized losses | 0 | (157)
Securities held to maturity, fair value | 10,001 | 9,843
U.S. treasuries |  |
Debt securities, available-for-sale: |  |
Securities available for sale, amortized cost | 100 | 100
Securities available for sale, unrealized gains | 0 | 0
Securities available for sale, unrealized losses | 0 | (2)
Securities available for sale, fair value | 100 | 98
Government agency issued mortgage-backed securities (“MBS”) |  |
Debt securities, available-for-sale: |  |
Securities available for sale, amortized cost | 2,316,381 | 2,473,687
Securities available for sale, unrealized gains | 34,692 | 4,819
Securities available for sale, unrealized losses | (2,556) | (58,400)
Securities available for sale, fair value | 2,348,517 | 2,420,106
Government agency issued collateralized mortgage obligations (“CMO”) |  |
Debt securities, available-for-sale: |  |
Securities available for sale, amortized cost | 1,667,773 | 2,006,488
Securities available for sale, unrealized gains | 9,916 | 888
Securities available for sale, unrealized losses | (7,197) | (48,681)
Securities available for sale, fair value | 1,670,492 | 1,958,695
Other U.S. government agencies |  |
Debt securities, available-for-sale: |  |
Securities available for sale, amortized cost | 303,463 | 149,050
Securities available for sale, unrealized gains | 3,750 | 809
Securities available for sale, unrealized losses | (1,121) | (73)
Securities available for sale, fair value | 306,092 | 149,786
Corporates and other debt |  |
Debt securities, available-for-sale: |  |
Securities available for sale, amortized cost | 40,054 | 55,383
Securities available for sale, unrealized gains | 486 | 388
Securities available for sale, unrealized losses | 0 | (461)
Securities available for sale, fair value | 40,540 | 55,310
State and municipalities |  |
Debt securities, available-for-sale: |  |
Securities available for sale, amortized cost | 57,232 | 32,473
Securities available for sale, unrealized gains | 3,324 | 314
Securities available for sale, unrealized losses | (30) | (214)
Securities available for sale, fair value | 60,526 | 32,573
Available-for-sale securities, excluding interest only strips |  |
Debt securities, available-for-sale: |  |
Securities available for sale, amortized cost | 4,385,003 | 4,717,181
Securities available for sale, unrealized gains | 52,168 | 7,218
Securities available for sale, unrealized losses | (10,904) | (107,831)
Securities available for sale, fair value | 4,426,267 | 4,616,568
Interest-Only Strip (elected fair value) |  |
Debt securities, available-for-sale: |  |
Securities available for sale, fair value | 19,136 | 9,902
Corporates and other debt |  |
Securities held-to-maturity: |  |
Amortized Cost | 10,000 | 10,000
Securities held to maturity, gross unrealized gains | 1 | 0
Securities held to maturity, gross unrealized losses | 0 | (157)
Securities held to maturity, fair value | $ 10,001 | $ 9,843

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