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Variable Interest Entities - Summary Of VIE Not Consolidated By FHN (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019 | Jun. 30, 2019
--- | --- | --- | ---
Variable Interest Entity [Line Items] |  |  |  |  |
Loans, net of unearned income | $ 32,708,937 | [1] | $ 31,061,111 | [1] | $ 29,712,810
Trading securities | 1,116,450 |  | 1,346,207 |  |
Term borrowings | 2,032,476 |  | 791,368 |  |
Securities available-for-sale | 5,476,156 |  | 4,445,403 |  |
Low Income Housing Partnerships |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Maximum Loss Exposure | 248,712 |  | 237,668 |  |
Liability Recognized | 124,318 |  | 136,404 |  |
Maximum loss exposure, contractual funding commitments | 124,300 |  | 136,400 |  |
Low Income Housing Partnerships | Other Assets |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Maximum loss exposure, current investments | 124,400 |  | 101,300 |  |
Other Tax Credit Investments |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Maximum Loss Exposure | 5,959 |  | 6,282 |  |
Liability Recognized | 0 |  | 0 |  |
Small Issuer Trust Preferred Holdings |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Maximum Loss Exposure | 209,177 |  | 238,397 |  |
Liability Recognized | 0 |  | 0 |  |
On Balance Sheet Trust Preferred Securitization |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Maximum Loss Exposure | 32,144 |  | 33,265 |  |
Liability Recognized | 82,030 |  | 80,908 |  |
Loans, net of unearned income | 112,500 |  | 112,500 |  |
Trading securities | 1,700 |  | 1,700 |  |
Term borrowings | 82,000 |  | 80,900 |  |
Proprietary & Agency Residential Mortgage Securitizations |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Maximum Loss Exposure | 628 |  | 941 |  |
Liability Recognized | 0 |  | 0 |  |
Holdings Of Agency Mortgage Backed Securities |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Maximum Loss Exposure | 4,561,144 |  | 4,537,685 |  |
Liability Recognized | 0 |  | 0 |  |
Trading securities | 700,000 |  | 500,000 |  |
Securities available-for-sale | 3,900,000 |  | 4,000,000 |  |
Commercial Loan Troubled Debt Restructurings |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Maximum Loss Exposure | 43,432 |  | 45,169 |  |
Liability Recognized | 0 |  | 0 |  |
Maximum loss exposure, contractual funding commitments |  |  | 1,800 |  |
Loans, net of unearned income | 43,400 |  | 43,400 |  |
Sale Leaseback Transaction |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Maximum Loss Exposure | 18,052 |  | 18,111 |  |
Liability Recognized | 0 |  | 0 |  |
Proprietary Trust Preferred Issuances |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Maximum Loss Exposure | 0 |  | 0 |  |
Liability Recognized | $ 167,014 |  | $ 167,014 |  |
[1] | June 30, 2020 and December 31, 2019 include $16.9 million and $18.8 million, respectively, of held-to-maturity consumer mortgage loans secured by residential real estate in process of foreclosure.

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