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Contingencies And Other Disclosures (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018
Loss Contingencies [Line Items] |  |
Estimated litigation liability | $ 24.5 |
Accrued losses on loan repurchase exposure | 17.5 | $ 32.3
Mortgage Securitization Litigation |  |
Loss Contingencies [Line Items] |  |
Investment in proprietary securitizations subject to lawsuits | 83.4 |
Investment in proprietary securitizations subject to indemnifications | $ 231.2 |

X
- Definition Total amount of indemnities claimed by plaintiffs to have invested in proprietary securitizations and seeking repurchase of investments. + References No definition available. + Details
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Balance Type: | credit
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- Definition Total amount of lawsuitss claimed by plaintiffs to have invested in proprietary securitizations and seeking repurchase of investments. + References No definition available. + Details
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Namespace Prefix: | fhn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The liability for estimated repurchase losses associated with repurchase obligations for alleged breeches of representations and warranties. + References No definition available. + Details
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Balance Type: | credit
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X
- Definition Aggregate carrying amount of the estimated litigation liability for known or estimated probable loss from litigation, which may include attorneys' fees and other litigation costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118942415&loc=d3e14326-108349 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.25) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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