Fair Value Of Assets And Liabilities (Summary Of Book Value And Estimated Fair Value Of Financial Instruments) (Details) (USD $) In Thousands	Jun. 30, 2011		Dec. 31, 2010	Jun. 30, 2010
Loans, net of unearned income and allowance for loan losses	$ 15,537,555		$ 16,117,773	$ 16,372,781
Trading Securities	1,196,380		769,750	1,806,789
Loans held for sale	225,242			240,510
Loans Receivable Held-for-sale, Net	397,931		375,289	505,237
Securities available for sale	3,230,477	[1]	3,031,930	2,489,819	[2]
Total deposits	15,896,027		15,208,231	15,201,816
Trading liabilities	498,915		361,920	481,477
Term borrowings	2,502,517		3,228,070	2,926,675
Book Value [Member]
Loans, net of unearned income and allowance for loan losses	15,537,555			16,372,781
Short-term financial assets	861,441			878,058
Trading Securities	1,196,380			1,806,789
Loans Receivable Held-for-sale, Net	397,931			505,237
Securities available for sale	3,230,477			2,489,819
Derivative assets	304,676			345,110
Other assets	104,409			124,088
Nonearning assets	1,019,589			1,283,951
Defined maturity	1,791,174			2,169,430
Undefined maturity	14,104,853			13,032,386
Total deposits	15,896,027			15,201,816
Trading liabilities	498,915			481,477
Short-term financial liabilities	2,193,901			2,766,339
Term borrowings	2,502,517			2,926,675
Derivative liabilities	212,289			215,047
Other noninterest-bearing liabilities	498,726			795,914
Fair Value [Member]
Loans, net of unearned income and allowance for loan losses	14,667,125			15,369,601
Short-term financial assets	861,441			878,058
Trading Securities	1,196,380			1,806,789
Loans Receivable Held-for-sale, Net	397,931			505,237
Securities available for sale	3,230,477			2,489,819
Derivative assets	304,676			345,110
Other assets	104,409			124,088
Nonearning assets	1,019,589			1,283,951
Defined maturity	1,840,353			2,258,257
Undefined maturity	14,104,853			13,032,386
Total deposits	15,945,206			15,290,643
Trading liabilities	498,915			481,477
Short-term financial liabilities	2,193,901			2,766,339
Term borrowings	2,301,311			2,570,179
Derivative liabilities	212,289			215,047
Other noninterest-bearing liabilities	498,726			795,914
Loan commitments	1,234			1,107
Standby and other commitments	6,534			6,133
Contractual Amount [Member]
Loan commitments	7,938,091			7,950,124
Standby and other commitments	$ 391,539			$ 513,936

[1] Includes $2.9 billion of securities pledged to secure public deposits, securities sold under agreements to repurchase, and for other purposes. As of June 30, 2011, FHN had pledged $1.1 billion of the $2.9 billion pledged available for sale securities as collateral for securities sold under repurchase agreements.

[2] Includes $2.1 billion of securities pledged to secure public deposits, securities sold under agreements to repurchase, and for other purposes. As of June 30, 2010, FHN had pledged $1.3 billion of the $2.1 billion pledged available for sale securities as collateral for securities sold under repurchase agreements.