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Variable Interest Entities - Summary of VIE Not Consolidated By FHN (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Variable Interest Entity [Line Items] |  |  |  |  |
Loans, net of unearned income | $ 27,535,532 | [1] | $ 27,658,929 | [1] | $ 19,589,520
Term borrowings | 1,170,963 |  | 1,218,097 |  |
Trading securities | 1,448,168 |  | 1,416,345 |  |
Securities available-for-sale (Note 3) | 4,626,470 |  | 5,170,255 |  |
Securities available-for-sale (a) |  |  | 5,170,255 |  |
Low income housing partnerships |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Maximum Loss Exposure | 156,056 |  | 94,798 |  |
Liability Recognized | 80,427 |  | 33,348 |  |
Maximum loss exposure, contractual funding commitments | 80,400 |  | 33,300 |  |
Low income housing partnerships | Other Assets |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Maximum loss exposure, current investments | 75,600 |  | 61,500 |  |
Other tax credit investments |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Maximum Loss Exposure | 3,619 |  | 20,394 |  |
Liability Recognized | 0 |  | 0 |  |
Other tax credit investments | Other Assets |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Maximum loss exposure, current investments | 2,700 |  | 18,000 |  |
Small issuer trust preferred holdings |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Maximum Loss Exposure | 270,585 |  | 332,455 |  |
Liability Recognized | 0 |  | 0 |  |
On-balance sheet trust preferred securitization |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Maximum Loss Exposure | 37,532 |  | 48,817 |  |
Liability Recognized | 76,642 |  | 65,357 |  |
Loans, net of unearned income | 112,500 |  | 112,500 |  |
Term borrowings | 76,600 |  | 65,400 |  |
Trading securities | 1,700 |  | 1,700 |  |
Proprietary residential mortgage securitizations |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Maximum Loss Exposure | 1,524 |  | 2,151 |  |
Liability Recognized | 0 |  | 0 |  |
Holdings of agency mortgage-backed securities |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Maximum Loss Exposure | 4,842,630 |  | 5,349,287 |  |
Liability Recognized | 0 |  | 0 |  |
Trading securities | 500,000 |  | 500,000 |  |
Securities available-for-sale (Note 3) | 4,400,000 |  |  |  |
Securities available-for-sale (a) |  |  | 4,800,000 |  |
Commercial loan troubled debt restructurings |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Maximum Loss Exposure | 40,590 |  | 19,411 |  |
Liability Recognized | 0 |  | 0 |  |
Maximum loss exposure, contractual funding commitments | 2,300 |  | 300 |  |
Loans, net of unearned income | 38,200 |  | 19,100 |  |
Sale-leaseback transaction |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Maximum Loss Exposure | 16,327 |  | 14,827 |  |
Liability Recognized | 0 |  | 0 |  |
Proprietary trust preferred issuances |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Maximum Loss Exposure | 0 |  | 0 |  |
Liability Recognized | $ 167,014 |  | $ 212,378 |  |
[1] | December 31, 2018 and 2017 include $28.6 million and $22.7 million, respectively, of held-to-maturity consumer mortgage loans secured by residential real estate in process of foreclosure.

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- Definition Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524 + Details
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