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Derivatives (Tables) | 12 Months Ended
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Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Derivatives Associated With Fixed Income Trading Activities | The following tables summarize FHN’s derivatives associated with fixed income trading activities as of December 31, 2017 and 2016:
|  | December 31, 2017
(Dollars in thousands) |  | Notional |  | Assets |  | Liabilities
Customer Interest Rate Contracts |  | $ | 2,026,753 |  |  | $ | 22,097 |  |  | $ | 18,323 |
Offsetting Upstream Interest Rate Contracts |  | 2,026,753 |  |  | 17,931 |  |  | 20,720 |
Option Contracts Purchased |  | 20,000 |  |  | 15 |  |  | — |
Forwards and Futures Purchased |  | 6,257,140 |  |  | 4,354 |  |  | 5,526 |
Forwards and Futures Sold |  | 6,292,012 |  |  | 5,806 |  |  | 4,010 |
|  | December 31, 2016
(Dollars in thousands) |  | Notional |  | Assets |  | Liabilities
Customer Interest Rate Contracts |  | $ | 1,697,992 |  |  | $ | 39,495 |  |  | $ | 14,996 |
Offsetting Upstream Interest Rate Contracts |  | 1,697,992 |  |  | 14,996 |  |  | 39,495 |
Option Contracts Purchased |  | 17,500 |  |  | 63 |  |  | — |
Option Contracts Written |  | 5,000 |  |  | — |  |  | 8 |
Forwards and Futures Purchased |  | 2,916,750 |  |  | 6,257 |  |  | 26,659 |
Forwards and Futures Sold |  | 3,085,396 |  |  | 27,330 |  |  | 6,615 |
Derivatives Associated With Interest Rate Risk Management Activities | The following tables summarize FHN’s derivatives associated with interest rate risk management activities as of December 31, 2017 and 2016:
|  | December 31, 2017 |  |
(Dollars in thousands) |  | Notional |  | Assets |  | Liabilities |  |
Customer Interest Rate Contracts Hedging |  |  |  |  |  |  |  |
Hedging Instruments and Hedged Items: |  |  |  |  |  |  |  |
Customer Interest Rate Contracts |  | $ | 1,608,912 |  |  | $ | 11,644 |  |  | $ | 19,780 |  |  |
Offsetting Upstream Interest Rate Contracts |  | 1,608,912 |  |  | 18,473 |  |  | 11,019 |  |  |
Debt Hedging |  |  |  |  |  |  |  |
Hedging Instruments: |  |  |  |  |  |  |  |
Interest Rate Swaps |  | $ | 900,000 |  |  | $ | 371 |  |  | N/A |  |  |
Hedged Items: |  |  |  |  |  |  |  |
Term Borrowings |  | N/A |  |  | N/A |  |  | $ | 900,000 |  |  | (a)
|  | December 31, 2016 |  |
(Dollars in thousands) |  | Notional |  | Assets |  | Liabilities |  |
Customer Interest Rate Contracts Hedging |  |  |  |  |  |  |  |
Hedging Instruments and Hedged Items: |  |  |  |  |  |  |  |
Customer Interest Rate Contracts |  | $ | 1,357,920 |  |  | $ | 17,566 |  |  | $ | 14,277 |  |  |
Offsetting Upstream Interest Rate Contracts |  | 1,357,920 |  |  | 14,277 |  |  | 18,066 |  |  |
Debt Hedging |  |  |  |  |  |  |  |
Hedging Instruments: |  |  |  |  |  |  |  |
Interest Rate Swaps |  | $ | 900,000 |  |  | $ | 1,628 |  |  | $ | 7,276 |  |  |
Hedged Items: |  |  |  |  |  |  |  |
Term Borrowings |  | N/A |  |  | N/A |  |  | $ | 900,000 |  |  | (a)
(a) | Represents par value of term borrowings being hedged.
Gains/(Losses) on Derivatives Associated with Interest Rate Risk Management Activities | The following table summarizes gains/(losses) on FHN’s derivatives associated with interest rate risk management activities for the years ended December 31, 2017, 2016, and 2015:
|  | Year Ended December 31
|  | 2017 |  | 2016 |  | 2015
(Dollars in thousands) |  | Gains/(Losses) |  | Gains/(Losses) |  | Gains/(Losses)
Customer Interest Rate Contracts Hedging |  |  |  |
Hedging Instruments and Hedged Items: |  |  |  |  |  |
Customer Interest Rate Contracts (a) |  | $ | (10,703 | ) |  | $ | (22,969 | ) |  | 604 |
Offsetting Upstream Interest Rate Contracts (a) |  | 10,699 |  |  | 22,969 |  |  | (604 | )
Debt Hedging |  |  |  |  |  |
Hedging Instruments: |  |  |  |  |  |
Interest Rate Swaps (a) |  | $ | (7,766 | ) |  | $ | (3,552 | ) |  | $ | (23,194 | )
Hedged Items: |  |  |  |  |  |
Term Borrowings (a) (b) |  | 7,582 |  |  | 3,429 |  |  | 23,414 |
(a) | Gains/losses included in the All other expense section of the Consolidated Statements of Income.
(b) | Represents gains and losses attributable to changes in fair value due to interest rate risk as designated in ASC 815-20 hedging relationships.
Derivative Associated With Cash Flow Hedges | The following tables summarize FHN’s derivative activities associated with cash flow hedges as of December 31, 2017 and 2016:
|  | December 31, 2017
(Dollars in thousands) |  | Notional |  | Assets |  | Liabilities
Cash Flow Hedges |  |  |  |  |  |
Hedging Instruments: |  |  |  |  |  |
Interest Rate Swaps |  | $ | 900,000 |  |  | $ | 942 |  |  | N/A
Hedged Items: |  |  |  |  |  |
Variability in Cash Flows Related to Debt Instruments (Primarily Loans) |  | N/A |  |  | $ | 900,000 |  |  | N/A
|  | December 31, 2016
(Dollars in thousands) |  | Notional |  | Assets |  | Liabilities
Cash Flow Hedges |  |  |  |  |  |
Hedging Instruments: |  |  |  |  |  |
Interest Rate Swaps |  | $ | 250,000 |  |  | N/A |  |  | $ | 2,045 |
Hedged Items: |  |  |  |  |  |
Variability in Cash Flows Related to Debt Instruments (Primarily Loans) |  | N/A |  |  | $ | 250,000 |  |  | N/A |
Gains/(Losses) on Derivatives Associated with Cash Flow Hedges | The following table summarizes gains/(losses) on FHN’s derivatives associated with cash flow hedges for the years ended December 31, 2017 and 2016:
|  | Year Ended December 31
|  | 2017 |  | 2016
(Dollars in thousands) |  | Gains/(Losses) |  | Gains/(Losses)
Cash Flow Hedges |  |
Hedging Instruments: |  |  |  |
Interest Rate Swaps (a) (b) |  | $ | (8,264 | ) |  | $ | (2,045 | )
Hedged Items: |  |  |  |
Variability in Cash Flows Related to Debt Instruments (Primarily Loans) |  | N/A |  |  | N/A |
(a) | Amount represents the pre-tax gains/(losses) included within AOCI.
(b) | Approximately $3.0 million of losses are expected to be reclassified into earnings in the next twelve months.
Schedule Of Derivative Activities Associated With Trust Preferred Loans | The following table summarizes FHN’s derivative activities associated with held-to-maturity trust preferred loans as of December 31, 2016:
|  | December 31, 2016
(Dollars in thousands) |  | Notional |  | Assets |  |  |  | Liabilities
Loan Portfolio Hedging |  |  |  |  |  |  |  |
Hedging Instruments: |  |  |  |  |  |  |  |
Interest Rate Swaps |  | $ | 6,500 |  |  | N/A |  |  |  |  | $ | 208 |
Hedged Items: |  |  |  |  |  |  |  |
Trust Preferred Loans (a) |  | N/A |  |  | $ | 6,500 |  |  | (b) |  | N/A |
(a) | Assets included in the Loans, net of unearned income section of the Consolidated Statements of Condition.
(b) | Represents principal balance being hedged.
Gains/(Losses) on Derivatives Associated with Trust Preferred Loans | The following table summarizes gains/(losses) on FHN’s derivatives associated with held-to-maturity trust preferred loans for the year ended December 31, 2016 and 2015:
|  | Year Ended December 31
|  | 2016 |  | 2015
(Dollars in thousands) |  | Gains/(Losses) |  | Gains/(Losses)
Loan Portfolio Hedging |  |  |  |
Hedging Instruments: |  |  |  |
Interest Rate Swaps |  | $ | 280 |  |  | $ | 256 |
Hedged Items: |  |  |  |
Trust Preferred Loans (a) |  | $ | (276 | ) |  | $ | (253 | )
(a) | Represents gains and losses attributable to changes in fair value due to interest rate risk as designated in ASC 815-20 hedging relationships.
Derivative Assets And Collateral Received | The following table provides details of derivative assets and collateral received as presented on the Consolidated Statements of Condition as of December 31, 2017 and 2016:
|  |  |  |  |  |  |  | Gross amounts not offset in the Statements of Condition |  |
(Dollars in thousands) |  | Gross amounts of recognized assets |  | Gross amounts offset in the Statements of Condition |  | Net amounts of assets presented in the Statements of Condition (a) |  | Derivative liabilities available for offset |  | Collateral Received |  | Net amount
Derivative assets: |  |  |  |  |  |  |  |  |  |  |  |
December 31, 2017 (b) |  | $ | 71,458 |  |  | $ | — |  |  | $ | 71,458 |  |  | $ | (17,278 | ) |  | $ | (33,370 | ) |  | $ | 20,810 |
December 31, 2016 (b) |  | 87,962 |  |  | — |  |  | 87,962 |  |  | (25,953 | ) |  | (52,888 | ) |  | 9,121 |
(a) | Included in Derivative assets on the Consolidated Statements of Condition. As of December 31, 2017 and 2016, $10.2 million and $33.7 million, respectively, of derivative assets (primarily fixed income forward contracts) have been excluded from these tables because they are generally not subject to master netting or similar agreements.
(b) | Amounts are comprised entirely of interest rate derivative contracts.
Derivative Liabilities and Collateral Pledged | The following table provides details of derivative liabilities and collateral pledged as presented on the Consolidated Statements of Condition as of December 31, 2017 and 2016:
|  |  |  |  |  |  |  | Gross amounts not offset in the Statements of Condition |  |
(Dollars in thousands) |  | Gross amounts of recognized liabilities |  | Gross amounts offset in the Statements of Condition |  | Net amounts of liabilities presented in the Statements of Condition (a) |  | Derivative assets available for offset |  | Collateral pledged |  | Net amount
Derivative liabilities: |  |  |  |  |  |  |  |  |  |  |  |
December 31, 2017 (b) |  | $ | 69,842 |  |  | $ | — |  |  | $ | 69,842 |  |  | $ | (17,278 | ) |  | $ | (51,801 | ) |  | $ | 763 |
December 31, 2016 (b) |  | 96,363 |  |  | — |  |  | 96,363 |  |  | (25,953 | ) |  | (60,746 | ) |  | 9,664 |
(a) | Included in Derivative liabilities on the Consolidated Statements of Condition. As of December 31, 2017 and December 31, 2016, $15.2 million and $39.5 million, respectively, of derivative liabilities (primarily fixed income forward contracts) have been excluded from these tables because they are generally not subject to master netting or similar agreements.
(b) | Amounts are comprised entirely of interest rate derivative contracts.

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