Average of the combined loan to value ratios ("CLTV") at origination for loans with balances remaining. For residential real estate loans, the CLTV ratio is the proportion of loans secured by residential real estate in relation to the value of the property.

Name:	fhn_AverageOriginationCombinedLoanToValue
Namespace Prefix:	fhn
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

For loans with remaining balance, the average consumer credit risk score at origination. Consumer credit risk scores obtained from Fair Isaac Corporation.

+ Details

Name:	fhn_AverageOriginationCreditRiskScore
Namespace Prefix:	fhn
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

For loans with remaining balance, the updated average consumer credit risk score. Consumer credit risk scores obtained from Fair Isaac Corporation.

+ Details

Name:	fhn_AverageRefreshedCreditRiskScore
Namespace Prefix:	fhn
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

For loans with remaining balances, the percent of loans originated through broker channels.

+ Details

Name:	fhn_OriginationCharacteristicsBrokerPercentage
Namespace Prefix:	fhn
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

For loans with a balance remaining, the percent of originations that FHN is in first lien position.

+ Details

Name:	fhn_OriginationCharacteristicsFirstLienPercentage
Namespace Prefix:	fhn
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

For loans with remaining balances, percent of loans originated in Tennessee.

+ Details

Name:	fhn_OriginationCharacteristicsTnPercentage
Namespace Prefix:	fhn
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Loans of consolidated variable interest entities that can only be used to settle the liabilities of those VIEs.

+ Details

Name:	fhn_RestrictedLoanBalancesPermanentMortgage
Namespace Prefix:	fhn
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ Details

Name:	us-gaap_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix:	us-gaap
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Reflects the net carrying amount of consumer loans and leases held in portfolio, after deducting deferred income, but before deducting the allowance for losses on consumer loans and leases.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=6965416&loc=d3e5074-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Statement of Position (SOP)

-Number 01-6

-Paragraph 13

-Subparagraph e

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Audit and Accounting Guide (AAG)

-Number AAG-DEP

-Chapter 8

-Paragraph 116

-IssueDate 2006-05-01

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher OTS

-Name Federal Regulation (FR)

-Number Title 12

-Chapter V

-Section 563c.102

-Paragraph 8

-Subparagraph e

-Subsection I

-LegacyDoc This is a non-GAAP reference that was included in the 2009 taxonomy. It will be removed from future versions of this taxonomy.

+ Details

Name:	us-gaap_LoansAndLeasesReceivableConsumerNetOfDeferredIncome
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant