Loans (Period-End Balances And Various Asset Quality Attributes By Origination Vintage For Permanent Mortgage Classes Of Loans) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013		Dec. 31, 2012	Jun. 30, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	$ 16,197,046		$ 16,708,582	$ 16,185,763
Permanent Mortgage Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Permanent Mortgage - Period End Balance	746,154			755,707
Avg orig FICO	731			733
Avg Refreshed FICO	713			711
Loans, net of unearned income	746,154			755,707
Permanent Mortgage Portfolio Segment [Member] | Origination Vintage Period Pre2004 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Permanent Mortgage - Period End Balance	226,048	[1]		139,097
Avg orig FICO	725			724
Avg Refreshed FICO	726			733
Permanent Mortgage Portfolio Segment [Member] | Origination Vintage Period 2004 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Permanent Mortgage - Period End Balance	26,804			49,133
Avg orig FICO	714			715
Avg Refreshed FICO	692			688
Permanent Mortgage Portfolio Segment [Member] | Origination Vintage Period Two Thousand Five [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Permanent Mortgage - Period End Balance	43,459			54,680
Avg orig FICO	737			740
Avg Refreshed FICO	713			715
Permanent Mortgage Portfolio Segment [Member] | Origination Vintage Period Two Thousand Six [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Permanent Mortgage - Period End Balance	86,655			100,164
Avg orig FICO	733			735
Avg Refreshed FICO	712			708
Permanent Mortgage Portfolio Segment [Member] | Origination Vintage Period Two Thousand Seven [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Permanent Mortgage - Period End Balance	248,727			279,185
Avg orig FICO	733			733
Avg Refreshed FICO	711			705
Permanent Mortgage Portfolio Segment [Member] | Origination Vintage Period 2008 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Permanent Mortgage - Period End Balance	114,461			133,448
Avg orig FICO	742			742
Avg Refreshed FICO	713			713
Restricted Permanent Mortgage Real Estate Loans And Secured Borrowings [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	$ 12,400		$ 13,200	$ 16,900

[1] Increase in 2013 balance within the pre-2004 vintages reflect the impact of clean-up calls exercised by FHN during first quarter 2013 and third quarter 2012.