Contingencies And Other Disclosures (Narrative I) (Details) (USD $)	6 Months Ended	12 Months Ended					3 Months Ended	7 Months Ended	6 Months Ended						6 Months Ended					12 Months Ended	6 Months Ended		6 Months Ended				6 Months Ended				6 Months Ended		6 Months Ended
	Jun. 30, 2012 Y number	Dec. 31, 2008	Dec. 31, 2007	Jun. 25, 2012	Jun. 30, 2011	Jun. 25, 2012 First Lien Mortgage Securitizations [Member]	Jun. 30, 2011 Sentinel Litigation [Member]	Jul. 31, 2011 Sentinel Litigation [Member] number	Jun. 30, 2012 Proprietary Securitization [Member] number	Jun. 30, 2012 Single-Family Residential Loans [Member]	Jun. 30, 2011 Single-Family Residential Loans [Member]	Jun. 30, 2012 Mortgage Loans Serviced For Agencies [Member]	Jun. 30, 2012 M&T Arbitration Claim [Member]	Jun. 30, 2012 Active Securitizations [Member]	Jun. 30, 2012 Investments Subject To Subpoena [Member] number	Jun. 30, 2012 Mortgage Securitization Litigation [Member] number	Jun. 25, 2012 Mortgage Securitization Litigation [Member]	Sep. 30, 2011 Mortgage Securitization Litigation [Member] number	Dec. 31, 2010 Mortgage Securitization Litigation [Member] number	Dec. 31, 2011 Debit Transaction Sequencing Matter [Member]	Jun. 30, 2012 FHLB SF [Member]	Jun. 25, 2012 FHLB SF [Member]	Jun. 30, 2012 VA Loan Guarantee Matter [Member] number	Jun. 30, 2012 Metlife [Member]	Jun. 30, 2012 Alt-A [Member]	Jun. 30, 2012 Jumbo [Member]	Jun. 30, 2012 Maximum [Member] number	Jun. 30, 2012 Minimum [Member] number	Jun. 25, 2012 Two Credit Unions [Member] First Lien Mortgage Securitizations [Member]	Jun. 25, 2012 Two Credit Unions [Member] HELOC [Member]	Jun. 30, 2012 First Lien [Member] Investments Subject To Subpoena [Member] number	Jun. 30, 2012 HELOC [Member] number	Jun. 30, 2012 HELOC [Member] Investments Subject To Subpoena [Member] number	Jun. 30, 2012 HELOC [Member] FH proprietary securitization [Member] number	Jun. 25, 2012 Federal Housing Finance Agency [Member]	Jun. 25, 2012 Federal Housing Finance Agency [Member] Mortgage Securitization Litigation [Member]
Loss Contingencies [Line Items]
Number of subsidiaries								2
Number of former employees								2
Periods principal and interest distributions received by investors, in years																											7	5
Original principal balance of HELOCs sold in branch sales subject to repurchase claims													$ 45,500,000
Current UPB of HELOC subject to claims													23,600,000
Charged-off loans													11,800,000
Estimated reasonably possible losses in excess of currently established liabilities																											93,000,000	0
Number of lawsuits																4		2	2
Amount trustee would receive under terms of the settlement								38,500,000
Settlement expense							36,700,000
Actual damages sought by plaintiff																				5,000,000
Number of mortgage lenders																							13
Original unpaid principal balance of servicing portfolio												5,800,000,000
Current unpaid principal balance of servicing portfolio												5,200,000,000
Subservicer expenditure reimbursement amount disputed	7,400,000
Loans originated and sold to Agencies		69,500,000,000
Loans securitized, without recourse in proprietary transactions			47,000,000,000
Loans securitized related to active securitization trusts	36,700,000,000
Number of active securitization trusts									110																									3
Number of securitization trusts inactive									30
Loans sold on full recourse basis with servicing retained										39,800,000	52,300,000
Number of securitization trusts									140																						13		1
Number of federal credit unions invested in proprietary securitizations															2
Remaining balance in mortgage loans	11,000,000,000																								6,700,000,000	4,200,000,000
Stated percentage of voting rights	25.00%
Total original certificate balance with monoline insurance	128,400,000					97,100,000								103,400,000
Number of government entites															4
Original combined certificate balances of investments subject to subpoena																						601,100,000							321,600,000	299,800,000
Current combined certificate balances of investments subject to subpoena																						201,300,000							145,900,000	108,000,000
Number of trusts in which home equity lines and loans were securitized	7																															6
Purchase price of senior certificates	201,300,000																				100,100,000			101,200,000
Investment in proprietary securitizations subject to litigation																1,100,000,000
Ending certificate balance of the investments subject to lawsuits																	518,400,000																			355,400,000
Investments percentage performing																																				80.00%
Cumulative losses on investments, percentage of unpaid balance																																			6.00%
Cumulative original note balances of the HELOC proprietary securitizations				1,000,000,000
Current note balances of the HELOC proprietary securitizations				400,000,000
Unpaid principal balance of loans sold where private mortgage insurance had been cancelled	393,700,000				208,900,000
Number of indemnities	2
Number of suits	6
Number of HELOC securitizations being reviewed	2
Number of securitizations in which certificates were purchased																12
Estimated Litigation Liability	22,000,000
Number of securitizations in which a trustee has commenced a legal proceeding	1
Number of suits in which ending certificate balances are disclosed	5
Number of GSEs to which conventional conforming single-family mortgage loans were predominately sold to	2
Number of years with little communitcation regarding the supoena by the federal regulator of credit unions	2
Number of years of the subservicing arrangement	3
Number of credit unions that invested in a FH securitization with a HELOC certificate balance	1
FHN is one of mulitple defendants	1
Number of suits in which FHN is unable to estimate a range of reasonably possible loss	5
FHN is one of several defendants in a civil lawsuit	1
Loans sold to GSEs		57,600,000,000
Loans guaranteed by Ginnie Mae		$ 11,900,000,000