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Master Netting And Similar Agreements (Tables) | 3 Months Ended
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Mar. 31, 2017
Master Netting And Similar Agreements [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 March 31, 2017 and December 31, 2016:
|  |  |  |  |  |  |  |  |  |  | Gross amounts not offset in the |  |  |  |
|  |  |  |  |  |  |  |  |  |  | Statements of Condition |  |  |  |
|  |  |  | Gross amounts |  | Net amounts of |  | Offsetting |  | Securities collateral |  |  |  |
| Gross amounts |  | offset in the |  | assets presented |  | securities sold |  | (not recognized on |  |  |  |
| of recognized |  | Statements of |  | in the Statements |  | under agreements |  | FHN's Statements |  |  |  |
(Dollars in thousands) | assets |  | Condition |  | of Condition |  | to repurchase |  | of Condition) |  | Net amount |
Securities purchased under agreements to resell: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
March 31, 2017 | $ | 835,222 |  | $ | - |  | $ | 835,222 |  | $ | (150) |  | $ | (828,596) |  | $ | 6,476 |
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 March 31, 2017 and December 31, 2016:
|  |  |  |  |  |  |  |  |  |  | Gross amounts not offset in the |  |  |  |
|  |  |  |  |  |  |  |  |  |  | Statements of Condition |  |  |  |
|  |  |  | Gross amounts |  | Net amounts of |  | Offsetting |  |  |  |  |  |  |
| Gross amounts |  | offset in the |  | liabilities presented | securities |  |  |  |  |  |  |
| of recognized |  | Statements of |  | in the Statements |  | purchased under |  | Securities |  |  |  |
(Dollars in thousands) | liabilities |  | Condition |  | of Condition |  | agreements to resell | Collateral |  | Net amount |
Securities sold under agreements to repurchase: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
March 31, 2017 | $ | 406,354 |  | $ | - |  | $ | 406,354 |  | $ | (150) |  | $ | (406,185) |  | $ | 19 |
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 |
Due to the short duration of Securities sold under agreements to repurchase and the nature of collateral involved, the risks associated with these transactions are considered minimal. The following tables provide details, by collateral type, of the remaining contractual maturity of Securities sold under agreements to repurchase as of March 31, 2017 and December 31, 2016:
| March 31, 2017 |
| Overnight and |  |  |  |  |  |  |
(Dollars in thousands) | Continuous |  | Up to 30 Days |  | Total |
Securities sold under agreements to repurchase: |  |  |  |  |  |  |  |  |
U.S. treasuries | $ | 19,344 |  | $ | - |  | $ | 19,344 |
Government agency issued MBS |  | 345,156 |  |  | - |  |  | 345,156 |
Government agency issued CMO |  | 29,383 |  |  | 12,471 |  |  | 41,854 |
Total Securities sold under agreements to repurchase | $ | 393,883 |  | $ | 12,471 |  | $ | 406,354 |
| December 31, 2016 |
| Overnight and |  |  |  |  |  |  |
(Dollars in thousands) | 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 Master Netting And Similar Agreements [Abstract] + References No definition available. + Details
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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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- 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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