Variable Interest Entities (Summary Of VIE Not Consolidated By FHN) (Details) (USD $)	Jun. 30, 2014		Dec. 31, 2013	Jun. 30, 2013		Dec. 31, 2012
Variable Interest Entity [Line Items]
Loans, net of unearned income	$ 15,795,709,000		$ 15,389,074,000	$ 16,197,952,000	[1]
Term borrowings	1,501,209,000		1,739,859,000	1,800,255,000
Trading securities	1,150,280,000		801,718,000	1,267,348,000
Total MSR recognized by FHN	3,197,000		72,793,000	113,853,000		114,311,000
Custodial balances	4,513,800,000		4,637,839,000	4,603,954,000
Securities available-for-sale	3,576,542,000	[2]	3,398,457,000	3,228,379,000	[1],[3]
Low Income Housing Partnerships [Member]
Variable Interest Entity [Line Items]
Maximum Loss Exposure	45,235,000	[4],[5]		49,949,000	[4],[6]
Maximum loss exposure, contractual funding commitments	6,400,000			1,700,000
Liability Recognized	0	[4],[5]		0	[4],[6]
Low Income Housing Partnerships [Member] | Other Assets Member
Variable Interest Entity [Line Items]
Maximum loss exposure, current investments	38,900,000			48,200,000
New Market Tax Credit Llcs [Member]
Variable Interest Entity [Line Items]
Maximum Loss Exposure	22,211,000	[4],[7]		23,254,000	[4],[7]
Liability Recognized	0	[4],[7]		0	[4],[7]
New Market Tax Credit Llcs [Member] | Current Investment Funded By Borrowings [Member]
Variable Interest Entity [Line Items]
Maximum loss exposure, current investments	18,000,000			18,000,000
Small Issuer Trust Preferred Holdings [Member]
Variable Interest Entity [Line Items]
Maximum Loss Exposure	364,942,000	[8]		412,397,000	[8]
Liability Recognized	0	[8]		0	[8]
On Balance Sheet Trust Preferred Securitization [Member]
Variable Interest Entity [Line Items]
Maximum Loss Exposure	52,682,000	[9]		54,314,000	[10]
Liability Recognized	61,491,000	[9]		59,860,000	[10]
Loans, net of unearned income	112,500,000			112,500,000
Term borrowings	61,500,000			59,900,000
Trading securities	1,700,000			1,700,000
Proprietary Trust Preferred Issuances [Member]
Variable Interest Entity [Line Items]
Liability Recognized	206,186,000	[11]		206,186,000	[11]
Proprietary Agency Residential Mortgage Securitizations [Member]
Variable Interest Entity [Line Items]
Maximum Loss Exposure	35,118,000	[12]		396,441,000	[13]
Liability Recognized	0	[12]		0	[13]
Proprietary Agency Residential Mortgage Securitizations [Member] | Other Assets Member
Variable Interest Entity [Line Items]
Aggregate servicing advances	27,600,000			281,700,000
On Balance Sheet Consumer Loan Securitizations [Member]
Variable Interest Entity [Line Items]
Maximum Loss Exposure				17,474,000	[14]
Liability Recognized				252,651,000	[14]
Loans, net of unearned income				270,100,000
Term borrowings				252,700,000
Holdings Of Agency Mortgage Backed Securities [Member]
Variable Interest Entity [Line Items]
Maximum Loss Exposure	3,703,941,000	[15],[8]		3,509,648,000	[16],[8]
Liability Recognized	0	[15],[8]		0	[16],[8]
Trading securities	371,700,000			563,100,000
Securities available-for-sale	3,300,000,000			2,900,000,000
Short Positions In Agency Mortgage Backed Securities [Member]
Variable Interest Entity [Line Items]
Liability Recognized	1,092,000	[11]		24,904,000	[11]
Commercial Loan Troubled Debt Restructurings [Member]
Variable Interest Entity [Line Items]
Maximum Loss Exposure	57,157,000	[17],[18]		79,338,000	[17],[19]
Maximum loss exposure, contractual funding commitments	3,100,000			2,200,000
Liability Recognized	0	[17],[18]		0	[17],[19]
Loans, net of unearned income	54,000,000			77,100,000
Managed Discretionary Trusts [Member]
Variable Interest Entity [Line Items]
Maximum Loss Exposure	0	[11]		0	[11]
Liability Recognized	0	[11]		0	[11]
Proprietary Residential Mortgage Securitizations [Member]
Variable Interest Entity [Line Items]
Trading securities	6,400,000			7,500,000
Total MSR recognized by FHN	900,000			68,200,000
Agency Residential Mortgage Securitizations [Member]
Variable Interest Entity [Line Items]
Trading securities				8,400,000
Total MSR recognized by FHN	$ 200,000			$ 30,700,000

[1] June 30, 2013 balance has been re-presented due to purchase accounting adjustments made in third quarter 2013.

[2] Includes $3.4 billion of securities pledged to secure public deposits, securities sold under agreements to repurchase, and for other purposes.

[3] Includes $3.0 billion of securities pledged to secure public deposits, securities sold under agreements to repurchase, and for other purposes.

[4] A liability is not recognized as investments are written down over the life of the related tax credit.

[5] Maximum loss exposure represents $38.9 million of current investments and $6.4 million of contractual funding commitments. Only the current investment amount is included in Other assets.

[6] Maximum loss exposure represents $48.2 million of current investments and $1.7 million of contractual funding commitments. Only the current investment amount is included in Other assets.

[7] Maximum loss exposure represents current investment balance. Of the initial investment, $18.0 million was funded through loans from community development enterprises.

[8] Maximum loss exposure represents the value of current investments. A liability is not recognized as FHN is solely a holder of the trusts’ securities.

[9] Includes $112.5 million classified as Loans, net of unearned income, and $1.7 million classified as Trading securities which are offset by $61.5 million classified as Term borrowings.

[10] Includes $112.5 million classified as Loans, net of unearned income, and $1.7 million classified as Trading securities which are offset by $59.9 million classified as Term borrowings.

[11] No exposure to loss due to the nature of FHN’s involvement.

[12] Includes $.9 million and $.2 million classified as MSR related to proprietary and agency residential mortgage securitizations, respectively, and $6.4 million classified as Trading securities related to proprietary residential mortgage securitizations. Aggregate servicing advances of $27.6 million are classified as Other assets.

[13] Includes $68.2 million and $30.7 million classified as MSR and $7.5 million and $8.4 million classified as Trading securities related to proprietary and agency residential mortgage securitizations, respectively. Aggregate servicing advances of $281.7 million are classified as Other assets.

[14] Includes $270.1 million classified as Loans, net of unearned income which are offset by $252.7 million classified as Term borrowings.

[15] Includes $371.7 million classified as Trading securities and $3.3 billion classified as Securities available-for-sale.

[16] Includes $563.1 million classified as Trading securities and $2.9 billion classified as Securities available-for-sale.

[17] A liability is not recognized as the loans are the only variable interests held in the troubled commercial borrowers’ operations.

[18] Maximum loss exposure represents $54.0 million of current receivables and $3.1 million of contractual funding commitments on loans related to commercial borrowers involved in a troubled debt restructuring.

[19] Maximum loss exposure represents $77.1 million of current receivables and $2.2 million of contractual funding commitments on loans related to commercial borrowers involved in a troubled debt restructuring.