Fair Value Of Assets And Liabilities (Schedule Of Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012	Dec. 31, 2011
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans held-for-sale	$ 235,080		$ 223,483
Total securities available-for-sale	3,024,563		3,067,003
Total MSR recognized by FHN	113,853	114,311	129,291	144,069
Total other assets	258,061		363,455
Total assets	4,898,905		5,141,358
Other short-term borrowings	12,349		12,439
Total other liabilities	198,489		235,490
Total liabilities	807,707		718,560
Fair Value Inputs Level1 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans held-for-sale	0		0
Total securities available-for-sale	14,475		13,784
Total MSR recognized by FHN	0		0
Total other assets	48,704		45,168
Total assets	63,179		58,952
Other short-term borrowings	0		0
Total other liabilities	35,027		7,430
Total liabilities	35,027		7,430
Fair Value Inputs Level2 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans held-for-sale	0		8,923
Total securities available-for-sale	3,001,434		3,038,058
Total MSR recognized by FHN	0		0
Total other assets	209,357		318,287
Total assets	4,462,262		4,708,489
Other short-term borrowings	0		0
Total other liabilities	161,267		224,555
Total liabilities	758,136		695,186
Fair Value Inputs Level3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Trading securities	15,872
Loans held-for-sale	235,080		214,560
Total securities available-for-sale	8,654		15,161
Total MSR recognized by FHN	113,853		129,291
Total other assets	0		0
Total assets	373,464		373,917
Other short-term borrowings	12,349		12,439
Total other liabilities	2,195		3,505
Total liabilities	14,544		15,944
U S Treasury Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total securities available-for-sale	39,997		39,996
U S Treasury Securities [Member] | Fair Value Inputs Level1 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total securities available-for-sale	0		0
U S Treasury Securities [Member] | Fair Value Inputs Level2 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total securities available-for-sale	39,997		39,996
U S Treasury Securities [Member] | Fair Value Inputs Level3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total securities available-for-sale	0		0
Government Agency Issued Mortgage-Backed Securities ("MBS") [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total securities available-for-sale	992,454		1,383,724
Government Agency Issued Mortgage-Backed Securities ("MBS") [Member] | Fair Value Inputs Level1 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total securities available-for-sale	0		0
Government Agency Issued Mortgage-Backed Securities ("MBS") [Member] | Fair Value Inputs Level2 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total securities available-for-sale	992,454		1,383,724
Government Agency Issued Mortgage-Backed Securities ("MBS") [Member] | Fair Value Inputs Level3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total securities available-for-sale	0		0
Government Agency Issued Collateralized Mortgage Obligations ("CMO") [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total securities available-for-sale	1,954,038		1,589,376
Government Agency Issued Collateralized Mortgage Obligations ("CMO") [Member] | Fair Value Inputs Level1 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total securities available-for-sale	0		0
Government Agency Issued Collateralized Mortgage Obligations ("CMO") [Member] | Fair Value Inputs Level2 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total securities available-for-sale	1,954,038		1,589,376
Government Agency Issued Collateralized Mortgage Obligations ("CMO") [Member] | Fair Value Inputs Level3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total securities available-for-sale	0		0
Other U.S. Government Agencies [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total securities available-for-sale	2,854		13,153
Other U.S. Government Agencies [Member] | Fair Value Inputs Level1 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total securities available-for-sale	0		0
Other U.S. Government Agencies [Member] | Fair Value Inputs Level2 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total securities available-for-sale	0		8,492
Other U.S. Government Agencies [Member] | Fair Value Inputs Level3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total securities available-for-sale	2,854		4,661
States And Municipalities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total securities available-for-sale	16,445		17,970
States And Municipalities [Member] | Fair Value Inputs Level1 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total securities available-for-sale	0		0
States And Municipalities [Member] | Fair Value Inputs Level2 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total securities available-for-sale	14,945		16,470
States And Municipalities [Member] | Fair Value Inputs Level3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total securities available-for-sale	1,500		1,500
Corporate And Other Debt [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total securities available-for-sale			521
Corporate And Other Debt [Member] | Fair Value Inputs Level1 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total securities available-for-sale			521
Corporate And Other Debt [Member] | Fair Value Inputs Level2 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total securities available-for-sale			0
Corporate And Other Debt [Member] | Fair Value Inputs Level3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total securities available-for-sale			0
Venture Capital Investments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total securities available-for-sale	4,300		9,000
Venture Capital Investments [Member] | Fair Value Inputs Level1 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total securities available-for-sale	0		0
Venture Capital Investments [Member] | Fair Value Inputs Level2 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total securities available-for-sale	0		0
Venture Capital Investments [Member] | Fair Value Inputs Level3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total securities available-for-sale	4,300		9,000
Equity Mutual Funds And Other [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total securities available-for-sale	14,475		13,263
Equity Mutual Funds And Other [Member] | Fair Value Inputs Level1 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total securities available-for-sale	14,475		13,263
Equity Mutual Funds And Other [Member] | Fair Value Inputs Level2 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total securities available-for-sale	0		0
Equity Mutual Funds And Other [Member] | Fair Value Inputs Level3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total securities available-for-sale	0		0
Interest Only Strip [Member] | Fair Value Inputs Level3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Trading securities			14,900
Deferred Compensation Assets [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total other assets	22,302		22,645
Deferred Compensation Assets [Member] | Fair Value Inputs Level1 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total other assets	22,302		22,645
Deferred Compensation Assets [Member] | Fair Value Inputs Level2 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total other assets	0		0
Deferred Compensation Assets [Member] | Fair Value Inputs Level3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total other assets	0		0
Derivatives Forwards And Futures [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total other assets	26,402		22,523
Total other liabilities	35,027		7,430
Derivatives Forwards And Futures [Member] | Fair Value Inputs Level1 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total other assets	26,402		22,523
Total other liabilities	35,027		7,430
Derivatives Forwards And Futures [Member] | Fair Value Inputs Level2 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total other assets	0		0
Total other liabilities	0		0
Derivatives Forwards And Futures [Member] | Fair Value Inputs Level3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total other assets	0		0
Total other liabilities	0		0
Derivatives, Interest Rate Contracts [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total other assets	209,357		318,287
Total other liabilities	161,267		224,546
Derivatives, Interest Rate Contracts [Member] | Fair Value Inputs Level1 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total other assets	0		0
Total other liabilities	0		0
Derivatives, Interest Rate Contracts [Member] | Fair Value Inputs Level2 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total other assets	209,357		318,287
Total other liabilities	161,267		224,546
Derivatives, Interest Rate Contracts [Member] | Fair Value Inputs Level3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total other assets	0		0
Total other liabilities	0		0
Derivatives Other [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total other liabilities	2,195		3,514
Derivatives Other [Member] | Fair Value Inputs Level1 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total other liabilities	0		0
Derivatives Other [Member] | Fair Value Inputs Level2 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total other liabilities	0		9
Derivatives Other [Member] | Fair Value Inputs Level3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total other liabilities	2,195		3,505
Capital Markets [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Trading securities	1,251,476		1,337,559
Total trading liabilities - capital markets	596,869		470,631
Capital Markets [Member] | Fair Value Inputs Level1 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Trading securities	0		0
Total trading liabilities - capital markets	0		0
Capital Markets [Member] | Fair Value Inputs Level2 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Trading securities	1,251,471		1,337,554
Total trading liabilities - capital markets	596,869		470,631
Capital Markets [Member] | Fair Value Inputs Level3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Trading securities	5		5
Total trading liabilities - capital markets	0		0
Capital Markets [Member] | U S Treasury Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Trading securities	99,761		115,210
Total trading liabilities - capital markets	267,427		260,547
Capital Markets [Member] | U S Treasury Securities [Member] | Fair Value Inputs Level1 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Trading securities	0		0
Total trading liabilities - capital markets	0		0
Capital Markets [Member] | U S Treasury Securities [Member] | Fair Value Inputs Level2 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Trading securities	99,761		115,210
Total trading liabilities - capital markets	267,427		260,547
Capital Markets [Member] | U S Treasury Securities [Member] | Fair Value Inputs Level3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Trading securities	0		0
Total trading liabilities - capital markets	0		0
Capital Markets [Member] | Government Agency Issued Mortgage-Backed Securities ("MBS") [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Trading securities	446,797		469,805
Total trading liabilities - capital markets	3,977		473
Capital Markets [Member] | Government Agency Issued Mortgage-Backed Securities ("MBS") [Member] | Fair Value Inputs Level1 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Trading securities	0		0
Total trading liabilities - capital markets	0		0
Capital Markets [Member] | Government Agency Issued Mortgage-Backed Securities ("MBS") [Member] | Fair Value Inputs Level2 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Trading securities	446,797		469,805
Total trading liabilities - capital markets	3,977		473
Capital Markets [Member] | Government Agency Issued Mortgage-Backed Securities ("MBS") [Member] | Fair Value Inputs Level3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Trading securities	0		0
Total trading liabilities - capital markets	0		0
Capital Markets [Member] | Government Agency Issued Collateralized Mortgage Obligations ("CMO") [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Trading securities	116,347		125,404
Total trading liabilities - capital markets	20,927
Capital Markets [Member] | Government Agency Issued Collateralized Mortgage Obligations ("CMO") [Member] | Fair Value Inputs Level1 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Trading securities	0		0
Total trading liabilities - capital markets	0
Capital Markets [Member] | Government Agency Issued Collateralized Mortgage Obligations ("CMO") [Member] | Fair Value Inputs Level2 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Trading securities	116,347		125,404
Total trading liabilities - capital markets	20,927
Capital Markets [Member] | Government Agency Issued Collateralized Mortgage Obligations ("CMO") [Member] | Fair Value Inputs Level3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Trading securities	0		0
Total trading liabilities - capital markets	0
Capital Markets [Member] | Other U.S. Government Agencies [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Trading securities	158,226		275,756
Total trading liabilities - capital markets	43,425		27,152
Capital Markets [Member] | Other U.S. Government Agencies [Member] | Fair Value Inputs Level1 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Trading securities	0		0
Total trading liabilities - capital markets	0		0
Capital Markets [Member] | Other U.S. Government Agencies [Member] | Fair Value Inputs Level2 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Trading securities	158,226		275,756
Total trading liabilities - capital markets	43,425		27,152
Capital Markets [Member] | Other U.S. Government Agencies [Member] | Fair Value Inputs Level3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Trading securities	0		0
Total trading liabilities - capital markets	0		0
Capital Markets [Member] | States And Municipalities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Trading securities	11,950		46,596
Capital Markets [Member] | States And Municipalities [Member] | Fair Value Inputs Level1 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Trading securities	0		0
Capital Markets [Member] | States And Municipalities [Member] | Fair Value Inputs Level2 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Trading securities	11,950		46,596
Capital Markets [Member] | States And Municipalities [Member] | Fair Value Inputs Level3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Trading securities	0		0
Capital Markets [Member] | Corporate And Other Debt [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Trading securities	415,351		295,056
Total trading liabilities - capital markets	258,359		182,209
Capital Markets [Member] | Corporate And Other Debt [Member] | Fair Value Inputs Level1 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Trading securities	0		0
Total trading liabilities - capital markets	0		0
Capital Markets [Member] | Corporate And Other Debt [Member] | Fair Value Inputs Level2 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Trading securities	415,346		295,051
Total trading liabilities - capital markets	258,359		182,209
Capital Markets [Member] | Corporate And Other Debt [Member] | Fair Value Inputs Level3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Trading securities	5		5
Total trading liabilities - capital markets	0		0
Capital Markets [Member] | Equity Mutual Funds And Other [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Trading securities	3,044		9,732
Total trading liabilities - capital markets	2,754		250
Capital Markets [Member] | Equity Mutual Funds And Other [Member] | Fair Value Inputs Level1 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Trading securities	0		0
Total trading liabilities - capital markets	0		0
Capital Markets [Member] | Equity Mutual Funds And Other [Member] | Fair Value Inputs Level2 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Trading securities	3,044		9,732
Total trading liabilities - capital markets	2,754		250
Capital Markets [Member] | Equity Mutual Funds And Other [Member] | Fair Value Inputs Level3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Trading securities	0		0
Total trading liabilities - capital markets	0		0
Mortgage Banking [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Trading securities	15,872		20,567
Mortgage Banking [Member] | Fair Value Inputs Level1 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Trading securities	0		0
Mortgage Banking [Member] | Fair Value Inputs Level2 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Trading securities	0		5,667
Mortgage Banking [Member] | Fair Value Inputs Level3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Trading securities	15,872		14,900
Mortgage Banking [Member] | Principal Only Strip [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Trading securities	5,264		5,667
Mortgage Banking [Member] | Principal Only Strip [Member] | Fair Value Inputs Level1 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Trading securities	0		0
Mortgage Banking [Member] | Principal Only Strip [Member] | Fair Value Inputs Level2 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Trading securities	0		5,667
Mortgage Banking [Member] | Principal Only Strip [Member] | Fair Value Inputs Level3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Trading securities	5,264		0
Mortgage Banking [Member] | Interest Only Strip [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Trading securities	10,608		14,900
Mortgage Banking [Member] | Interest Only Strip [Member] | Fair Value Inputs Level1 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Trading securities	0		0
Mortgage Banking [Member] | Interest Only Strip [Member] | Fair Value Inputs Level2 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Trading securities	0		0
Mortgage Banking [Member] | Interest Only Strip [Member] | Fair Value Inputs Level3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Trading securities	$ 10,608		$ 14,900