Loan Sales And Securitizations (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Loan Sales And Securitizations [Abstract]
Origination of new MSRs			$ 0	$ 0
Percentage of single-family mortgage loans received as fees	0.29%	0.29%
Percentage of outstanding balance generating for annual servicing inclusive excess interests	0.34%	0.34%
Percentage of HELOC and home equity loans received as fees	0.50%	0.50%
Percentage variation in assumptions that can not necessarily be extrapolated	10.00%

Percentage Of Outstanding Balance Generating For Annual Servicing

No definition available.

Name:	fhn_PercentageOfOutstandingBalanceGeneratingForAnnualServicing
Namespace Prefix:	fhn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage Of Outstanding Balance Generating For Annual Servicing Including Excess Interests

+ References

No definition available.

+ Details

Name:	fhn_PercentageOfOutstandingBalanceGeneratingForAnnualServicingIncludingExcessInterests
Namespace Prefix:	fhn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of outstanding balances of HELOC and home equity loans transferred that, per contract, are due to the servicer in exchange for servicing the financial asset and would no longer be received by a servicer if the beneficial owners of the serviced assets (or their trustees or agents) were to exercise their actual or potential authority under the contract to shift the servicing to another servicer.

+ References

No definition available.

+ Details

Name:	fhn_PercentageOfOutstandingBalanceGeneratingForAnnualServicingOfHELOCAndHomeEquityLoans
Namespace Prefix:	fhn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage variation in assumptions that can not necessarily be extrapolated

+ References

No definition available.

+ Details

Name:	fhn_PercentageVariationInAssumptionsThatCanNotNecessarilyBeExtrapolated
Namespace Prefix:	fhn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The increase during the reporting period in the cumulative value of servicing rights. This increase is the result of new servicing rights that are created when mortgages are sold or transferred.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 28

-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.

+ Details

Name:	us-gaap_OriginationOfMortgageServicingRightsMSRs
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	us-gaap_TransfersAndServicingOfFinancialAssetsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration