XML 102 R86.htm IDEA: XBRL DOCUMENT
v3.7.0.1

Fair Value Of Assets And Liabilities (Narrative) (Details) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2017 USD ($) number | Mar. 31, 2016 USD ($)
Fair Value Of Assets And Liabilities [Abstract] |  |
Gain/(loss) on instrument specific credit risk | $ 0.2 | $ 0.1
Number of levels assets and liabilities are grouped in | number | 3 |
Long-lived asset impairment |  | $ 3.7

X
- Definition Fair Value of Assets and Liabilities. + References No definition available. + Details
Name: | fhn_FairValueOfAssetsAndLiabilitiesAbstract
Namespace Prefix: | fhn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Assets and liabilities measured at fair value are grouped into three levels. + References No definition available. + Details
Name: | fhn_NumberOfLevelsAssetsAndLiabilitiesAreGroupedIn
Namespace Prefix: | fhn_
Data Type: | xbrli:positiveIntegerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2420-110228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
Name: | us-gaap_AssetImpairmentCharges
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition This item represents the estimated amount of gains or losses included in earnings during the period attributable to changes in instrument-specific credit risk arising from loans and other receivables held as assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612 + Details
Name: | us-gaap_FairValueOptionCreditRiskGainsLossesOnAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration