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Investment Securities - Schedule Of FHN's Investment Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Securities available for sale, amortized cost | $ 4,639,167 |
Securities available-for-sale | 4,616,322 | $ 4,626,470
Schedule of Held-to-maturity Securities [Line Items] |  |
Total | 10,000 | 10,000
Securities held to maturity, gross unrealized gains | 0 | 0
Securities held to maturity, gross unrealized losses | (111) | (157)
Securities held to maturity, fair value | 9,889 | 9,843
Securities pledged as collateral | 3,900,000 | 3,800,000
U.S. treasuries |  |
Debt Securities, Available-for-sale [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 | (1) | (2)
Securities available-for-sale | 99 | 98
Government agency issued MBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Securities available for sale, amortized cost | 2,398,177 | 2,473,687
Securities available for sale, gross unrealized gains | 8,992 | 4,819
Securities available for sale, gross unrealized losses | (21,360) | (58,400)
Securities available-for-sale | 2,385,809 | 2,420,106
Government agency issued CMO |  |
Debt Securities, Available-for-sale [Line Items] |  |
Securities available for sale, amortized cost | 1,958,529 | 2,006,488
Securities available for sale, gross unrealized gains | 2,020 | 888
Securities available for sale, gross unrealized losses | (28,765) | (48,681)
Securities available-for-sale | 1,931,784 | 1,958,695
Other U.S. government agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Securities available for sale, amortized cost | 189,067 | 149,050
Securities available for sale, gross unrealized gains | 1,761 | 809
Securities available for sale, gross unrealized losses | 0 | (73)
Securities available-for-sale | 190,828 | 149,786
Corporates and other debt |  |
Debt Securities, Available-for-sale [Line Items] |  |
Securities available for sale, amortized cost | 55,266 | 55,383
Securities available for sale, gross unrealized gains | 302 | 388
Securities available for sale, gross unrealized losses | (384) | (461)
Securities available-for-sale | 55,184 | 55,310
States and municipalities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Securities available for sale, amortized cost | 38,028 | 32,473
Securities available for sale, gross unrealized gains | 1,395 | 314
Securities available for sale, gross unrealized losses | 0 | (214)
Securities available-for-sale | 39,423 | 32,573
Securities available-for-sale, excluding interest only strip: |  |
Debt Securities, Available-for-sale [Line Items] |  |
Securities available for sale, amortized cost | 4,639,167 | 4,717,181
Securities available for sale, gross unrealized gains | 14,470 | 7,218
Securities available for sale, gross unrealized losses | (50,510) | (107,831)
Securities available-for-sale | 4,603,127 | 4,616,568
Interest- only strips- AFS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Securities available-for-sale | 13,195 | 9,902
Corporate Bonds |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Total | 10,000 | 10,000
Securities held to maturity, gross unrealized gains | 0 | 0
Securities held to maturity, gross unrealized losses | (111) | (157)
Securities held to maturity, fair value | $ 9,889 | $ 9,843

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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