Amount Of Restricted Stock Or Units Forfeited

No definition available.

Name:	fhn_AmountOfRestrictedStockOrUnitsForfeited
Namespace Prefix:	fhn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of restricted stock or units to vest

+ References

No definition available.

+ Details

Name:	fhn_AmountOfRestrictedStockOrUnitsToVest
Namespace Prefix:	fhn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Annual equity awards granted non employee directors.

+ References

No definition available.

+ Details

Name:	fhn_AnnualEquityAwardsGrantedNonEmployeeDirectors
Namespace Prefix:	fhn_
Data Type:	xbrli:anyURIItemType
Balance Type:	na
Period Type:	duration

- Definition

Duration of performance evaluation for stock units to vest.

+ References

No definition available.

+ Details

Name:	fhn_DurationOfPerformanceEvaluation
Namespace Prefix:	fhn_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Period (in years) from the grant date in which stock options expire.

+ References

No definition available.

+ Details

Name:	fhn_ExpirationPeriod
Namespace Prefix:	fhn_
Data Type:	xbrli:anyURIItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of performance conditions achieved.

+ References

No definition available.

+ Details

Name:	fhn_PercentOfPerformanceConditionAchieved
Namespace Prefix:	fhn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Quarterly value of shares available for purchase under dividend reinvestment and stock purchase plan.

+ References

No definition available.

+ Details

Name:	fhn_QuarterlyValueOfSharesAvailableForPurchaseUnderDividendReinvestmentandstockpurchaseplan
Namespace Prefix:	fhn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Restriction lapsing rate for grant of restricted stock to nonemployee directors.

+ References

No definition available.

+ Details

Name:	fhn_RestrictionLapsingRateForGrantOfRestrictedStockToNonEmployeeDirectors
Namespace Prefix:	fhn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Value of annual equity awards to non employee directors.

+ References

No definition available.

+ Details

Name:	fhn_ValueOfAnnualEquityAwardsToNonEmployeeDirectors
Namespace Prefix:	fhn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Unrecognized cost of unvested share-based compensation awards.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

+ Details

Name:	us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(1)(i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

+ Details

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

- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (d)(2)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

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

- 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.

+ References

No definition available.

+ Details

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

- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Net number of share options (or share units) granted during the period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(iv)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (d)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of fully vested and expected to vest options that are exercisable.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (e)(2)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_PlanNameAxis=fhn_PerformanceConditionAwardsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PlanNameAxis=fhn_MarketConditionAwardMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PlanNameAxis=fhn_StockOptionAwardsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=us-gaap_ParentCompanyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_RestrictedStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PlanNameAxis=fhn_DirectorAwardsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_EmployeeStockOptionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_RestrictedStockUnitsRSUMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=fhn_StockOptionsIncludedInDeferralProgramGrantedPriorToJanuaryTwoTwoThousandFourMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=fhn_StockOptionsIncludedInDeferralProgramGrantedAfterJanuaryTwoTwoThousandFourMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=fhn_NonvestedRestrictedStockPlansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=fhn_TwoThousandTenUnitsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=fhn_TwoThousandElevenUnitsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Stock Options, Restricted Stock Incentive, And Dividend Revinvestment Plans (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2010	Dec. 31, 2009
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares available for grants	8,782,972
Compensation cost included in income from continuing operations for stock option and restricted stock plans	$ 11,351,000	$ 16,144,000	$ 16,201,000
Total income tax benefits recognized in income statements	$ 4,400,000	$ 6,200,000	$ 6,200,000
Stock options granted	592,551	866,742	1,248,685	0	0
Weighted average fair value of stock option at grant date	$ 3.5	$ 3.21	$ 3.8
Duration of performance evaluation	3 years
Performance Condition Awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting Period	3 years
Duration of performance evaluation	3 years	3 years	3 years
Market Condition Award [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting Period	5 years
Stock Option Awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options granted expiration	P7Y
Vesting Period	4 years
Intrinsic value of options exercised	$ 400,000
Parent Company [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Compensation cost included in income from continuing operations for stock option and restricted stock plans	$ 11,351,000	$ 16,144,000	$ 16,201,000
Restricted Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares available for grants	8,576,003
Total grant date fair value of shares vested	$ 15,500,000	13,800,000	$ 12,100,000
Restricted Stock [Member] \| Director Awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares granted to non-employee director, prior to 2007	8930
Employee Stock Options [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized compensation cost of nonvested restricted stock plans and stock options	$ 1,800,000
Recognizable weighted-average period of unrecognized compensation cost	2 years 6 months
Restricted Stock Units RSU [Member] \| Director Awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restriction lapsing rate for grants of restricted stock, awarded prior to 2007, to non-employee directors	10.00%
Value of annual equity awards to non-employee directors	$ 45,000	$ 45,000
Stock Options Included In Deferral Program Granted Prior To January Two Two Thousand Four [Member] \| Stock Option Awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options granted expiration	P20Y
Stock Options Included In Deferral Program Granted After January Two Two Thousand Four [Member] \| Stock Option Awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options granted expiration	P10Y
Nonvested Restricted Stock Plans [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized compensation cost of nonvested restricted stock plans and stock options	$ 14,200,000
Recognizable weighted-average period of unrecognized compensation cost	2 years 5 months
2010 Units \| Performance Condition Awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Amount of restricted stock or units to vest	25.00%	25.00%
Percentage of performance conditions achieved	50.00%
Amount Of Restricted Stock Or Units Forfeited	50.00%
2011 Units \| Performance Condition Awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of performance conditions achieved	87.50%
Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Quarterly value of shares available for purchase under dividend reinvestment and stock purchase plan	$ 10,000
Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Quarterly value of shares available for purchase under dividend reinvestment and stock purchase plan	$ 25