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Master Netting And Similar Agreements (Tables) | 9 Months Ended
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Sep. 30, 2017
Offsetting [Abstract] |
Securities Purchased Under Agreements To Resell And Collateral Pledged By Counterparties [Table Text Block] | The following table provides details of Securities purchased under agreements to resell as presented on the Consolidated Condensed Statements of Condition and collateral pledged by counterparties as of September 30, 2017 and December 31, 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 |  | Offsetting securities sold under agreements to repurchase |  | Securities collateral (not recognized on FHN’s Statements of Condition) |  | Net amount
Securities purchased under agreements to resell: |  |  |  |  |  |  |  |  |  |  |  |
September 30, 2017 |  | $ | 663,637 |  |  | $ | — |  |  | $ | 663,637 |  |  | $ | (1,044 | ) |  | $ | (655,136 | ) |  | $ | 7,457 |
December 31, 2016 |  | 613,682 |  |  | — |  |  | 613,682 |  |  | (1,628 | ) |  | (603,813 | ) |  | 8,241 |
Securities Sold Under Agreements To Repurchase And Collateral Pledged By Company [Table Text Block] | The following table provides details of Securities sold under agreements to repurchase as presented on the Consolidated Condensed Statements of Condition and collateral pledged by FHN as of September 30, 2017 and December 31, 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 |  | Offsetting securities purchased under agreements to resell |  | Securities/ government guaranteed loans collateral |  | Net amount
Securities sold under agreements to repurchase: |  |  |  |  |  |  |  |  |  |  |  |
September 30, 2017 |  | $ | 516,867 |  |  | $ | — |  |  | $ | 516,867 |  |  | $ | (1,044 | ) |  | $ | (515,673 | ) |  | $ | 150 |
December 31, 2016 |  | 453,053 |  |  | — |  |  | 453,053 |  |  | (1,628 | ) |  | (451,414 | ) |  | 11 |
Schedule of the Remaining Contractual Maturity by Collateral Type of Securities Sold Under Agreements To Repurchase | The following tables provide details, by collateral type, of the remaining contractual maturity of Securities sold under agreements to repurchase as of September 30, 2017 and December 31, 2016:
|  | September 30, 2017
(Dollars in thousands) |  | Overnight and Continuous |  | Up to 30 Days |  | Total
Securities sold under agreements to repurchase: |  |  |  |  |  |
U.S. treasuries |  | $ | 18,970 |  |  | $ | — |  |  | $ | 18,970 |
Government agency issued MBS |  | 276,903 |  |  | 5,521 |  |  | 282,424 |
Government agency issued CMO |  | 50,554 |  |  | 5,749 |  |  | 56,303 |
Government guaranteed loans (SBA and USDA) |  | 159,170 |  |  | — |  |  | 159,170 |
Total Securities sold under agreements to repurchase |  | $ | 505,597 |  |  | $ | 11,270 |  |  | $ | 516,867 |
|  | December 31, 2016
(Dollars in thousands) |  | Overnight and Continuous |  | Up to 30 Days |  | Total
Securities sold under agreements to repurchase: |  |  |  |  |  |
U.S. treasuries |  | $ | 14,864 |  |  | $ | — |  |  | $ | 14,864 |
Government agency issued MBS |  | 421,771 |  |  | — |  |  | 421,771 |
Government agency issued CMO |  | — |  |  | 16,418 |  |  | 16,418 |
Total Securities sold under agreements to repurchase |  | $ | 436,635 |  |  | $ | 16,418 |  |  | $ | 453,053 |

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- Definition Securities Purchased Under Agreements To Resell And Collateral Pledged By Counterparties [Table Text Block] + References No definition available. + Details
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- Definition Securities Sold Under Agreements To Repurchase And Collateral Pledged By Company [Table Text Block] + References No definition available. + Details
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- References No definition available. + Details
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- Definition Tabular disclosure of the nature and risks of short-term collateralized financing obtained through repurchase agreements, securities lending transactions and repurchase-to-maturity transactions, accounted for as secured borrowings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=64858031&loc=SL34722452-111729 + Details
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