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Variable Interest Entities - Summary Of VIE Not Consolidated By FHN (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2019
--- | --- | --- | ---
Variable Interest Entity [Line Items] |  |  |  |  |
Loans, net of unearned income | $ 33,378,303 | [1] | $ 31,061,111 | [1] | $ 27,990,048
Trading securities | 1,877,514 |  | 1,346,207 |  |
Term borrowings | 792,751 |  | 791,368 |  |
Securities available-for-sale | 4,544,907 |  | 4,445,403 |  |
Low Income Housing Partnerships |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Maximum Loss Exposure | 241,435 |  | 237,668 |  |
Liability Recognized | 123,720 |  | 136,404 |  |
Maximum loss exposure, contractual funding commitments | 123,700 |  | 136,400 |  |
Low Income Housing Partnerships | Other Assets |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Maximum loss exposure, current investments | 117,700 |  | 101,300 |  |
Other Tax Credit Investments |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Maximum Loss Exposure | 6,161 |  | 6,282 |  |
Liability Recognized | 0 |  | 0 |  |
Small Issuer Trust Preferred Holdings |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Maximum Loss Exposure | 234,214 |  | 238,397 |  |
Liability Recognized | 0 |  | 0 |  |
On Balance Sheet Trust Preferred Securitization |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Maximum Loss Exposure | 32,261 |  | 33,265 |  |
Liability Recognized | 81,912 |  | 80,908 |  |
Loans, net of unearned income | 112,500 |  | 112,500 |  |
Trading securities | 1,700 |  | 1,700 |  |
Term borrowings | 81,900 |  | 80,900 |  |
Proprietary & Agency Residential Mortgage Securitizations |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Maximum Loss Exposure | 785 |  | 941 |  |
Liability Recognized | 0 |  | 0 |  |
Holdings Of Agency Mortgage Backed Securities |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Maximum Loss Exposure | 5,126,372 |  | 4,537,685 |  |
Liability Recognized | 0 |  | 0 |  |
Trading securities | 1,100,000 |  | 500,000 |  |
Securities available-for-sale | 4,000,000 |  | 4,000,000 |  |
Commercial Loan Troubled Debt Restructurings |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Maximum Loss Exposure | 42,109 |  | 45,169 |  |
Liability Recognized | 0 |  | 0 |  |
Maximum loss exposure, contractual funding commitments | 500 |  | 1,800 |  |
Loans, net of unearned income | 41,600 |  | 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] | March 31, 2020 and December 31, 2019 include $20.8 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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