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Variable Interest Entities (Summary Of VIE Not Consolidated By FHN) (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016 | Sep. 30, 2016
--- | --- | --- | ---
Variable Interest Entity [Line Items] |  |  |  |  |
Loans, net of unearned income | $ 20,166,091 | [1] | $ 19,589,520 | [1] | $ 19,555,787
Term borrowings | 1,059,507 |  | 1,040,656 |  |
Trading securities | 1,469,402 |  | 897,071 |  |
Securities available-for-sale | 3,963,138 |  | 3,943,499 |  |
Low Income Housing Partnerships |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Maximum Loss Exposure | 96,007 |  | 73,582 |  |
Maximum loss exposure, contractual funding commitments | 34,200 |  | 17,400 |  |
Liability Recognized | 34,236 |  | 17,398 |  |
Low Income Housing Partnerships | Other Assets |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Maximum loss exposure, current investments | 61,800 |  | 56,200 |  |
Other Tax Credit Investments |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Maximum Loss Exposure | 20,444 |  | 21,898 |  |
Liability Recognized | 0 |  | 0 |  |
Other Tax Credit Investments | Other Assets |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Maximum loss exposure, current investments | 18,000 |  | 18,000 |  |
Small Issuer Trust Preferred Holdings |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Maximum Loss Exposure | 332,873 |  | 332,985 |  |
Liability Recognized | 0 |  | 0 |  |
On Balance Sheet Trust Preferred Securitization |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Maximum Loss Exposure | 48,902 |  | 49,361 |  |
Liability Recognized | 65,272 |  | 64,812 |  |
Loans, net of unearned income | 112,500 |  | 112,500 |  |
Term borrowings | 65,300 |  | 64,800 |  |
Trading securities | 1,700 |  | 1,700 |  |
Proprietary & Agency Residential Mortgage Securitizations |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Maximum Loss Exposure | 2,300 |  | 2,568 |  |
Liability Recognized | 0 |  | 0 |  |
Holdings Of Agency Mortgage Backed Securities |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Maximum Loss Exposure | 4,173,080 |  | 4,163,313 |  |
Liability Recognized | 0 |  | 0 |  |
Trading securities | 400,000 |  | 400,000 |  |
Securities available-for-sale | 3,800,000 |  | 3,800,000 |  |
Commercial Loan Troubled Debt Restructurings |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Maximum Loss Exposure | 21,763 |  | 42,696 |  |
Maximum loss exposure, contractual funding commitments | 600 |  | 5,200 |  |
Liability Recognized | 0 |  | 0 |  |
Loans, net of unearned income | 21,100 |  | 37,500 |  |
Sale Leaseback Transaction |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Maximum Loss Exposure | 14,827 |  | 11,827 |  |
Liability Recognized | $ 0 |  | $ 0 |  |
[1] | September 30, 2017 and December 31, 2016 include $24.8 million and $28.5 million, respectively, of held-to-maturity consumer mortgage loans secured by residential real estate properties in process of foreclosure.

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