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Variable Interest Entities - Summary Of VIE Not Consolidated By FHN (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Variable Interest Entity [Line Items] |  |
Total liabilities | $ 74,885,437 | $ 38,234,892
Loans and leases (including $12,372 and $— at fair value, respectively) | 59,706,531 | 31,061,111
Trading securities | 1,386,069 | 1,346,207
Term borrowings | 2,161,870 | 791,368
Securities available-for-sale | 7,995,872 | 4,445,403
Low Income Housing Partnerships |  |
Variable Interest Entity [Line Items] |  |
Maximum Loss Exposure | 338,558 | 237,668
Maximum loss exposure, contractual funding commitments | 166,900 | 136,400
Low Income Housing Partnerships | Variable Interest Entity, Not Primary Beneficiary |  |
Variable Interest Entity [Line Items] |  |
Total liabilities | 166,931 | 136,404
Low Income Housing Partnerships | Other Assets |  |
Variable Interest Entity [Line Items] |  |
Maximum loss exposure, current investments | 171,700 | 101,300
Other Tax Credit Investments |  |
Variable Interest Entity [Line Items] |  |
Maximum Loss Exposure | 66,172 | 6,282
Other Tax Credit Investments | Variable Interest Entity, Not Primary Beneficiary |  |
Variable Interest Entity [Line Items] |  |
Total liabilities | 34,993 | 0
Small Issuer Trust Preferred Holdings |  |
Variable Interest Entity [Line Items] |  |
Maximum Loss Exposure | 209,442 | 238,397
Small Issuer Trust Preferred Holdings | Variable Interest Entity, Not Primary Beneficiary |  |
Variable Interest Entity [Line Items] |  |
Total liabilities | 0 | 0
On Balance Sheet Trust Preferred Securitization |  |
Variable Interest Entity [Line Items] |  |
Maximum Loss Exposure | 32,031 | 33,265
Loans and leases (including $12,372 and $— at fair value, respectively) | 112,500 | 112,500
Trading securities | 1,700 | 1,700
Term borrowings | 82,100 | 80,900
On Balance Sheet Trust Preferred Securitization | Variable Interest Entity, Not Primary Beneficiary |  |
Variable Interest Entity [Line Items] |  |
Total liabilities | 82,143 | 80,908
Proprietary & Agency Residential Mortgage Securitizations |  |
Variable Interest Entity [Line Items] |  |
Maximum Loss Exposure | 471 | 941
Proprietary & Agency Residential Mortgage Securitizations | Variable Interest Entity, Not Primary Beneficiary |  |
Variable Interest Entity [Line Items] |  |
Total liabilities | 0 | 0
Holdings Of Agency Mortgage Backed Securities |  |
Variable Interest Entity [Line Items] |  |
Maximum Loss Exposure | 7,386,169 | 4,537,685
Trading securities | 900,000 | 500,000
Securities available-for-sale | 6,500,000 | 4,000,000
Holdings Of Agency Mortgage Backed Securities | Variable Interest Entity, Not Primary Beneficiary |  |
Variable Interest Entity [Line Items] |  |
Total liabilities | 0 | 0
Commercial Loan Troubled Debt Restructurings |  |
Variable Interest Entity [Line Items] |  |
Maximum Loss Exposure | 177,949 | 45,169
Maximum loss exposure, contractual funding commitments | 5,100 | 1,800
Loans and leases (including $12,372 and $— at fair value, respectively) | 172,800 | 43,400
Commercial Loan Troubled Debt Restructurings | Variable Interest Entity, Not Primary Beneficiary |  |
Variable Interest Entity [Line Items] |  |
Total liabilities | 0 | 0
Sale Leaseback Transaction |  |
Variable Interest Entity [Line Items] |  |
Maximum Loss Exposure | 17,993 | 18,111
Sale Leaseback Transaction | Variable Interest Entity, Not Primary Beneficiary |  |
Variable Interest Entity [Line Items] |  |
Total liabilities | 0 | 0
Proprietary Trust Preferred Issuances |  |
Variable Interest Entity [Line Items] |  |
Maximum Loss Exposure | 0 | 0
Proprietary Trust Preferred Issuances | Variable Interest Entity, Not Primary Beneficiary |  |
Variable Interest Entity [Line Items] |  |
Total liabilities | $ 287,124 | $ 167,014

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