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Acquisitions and Divestitures (Narrative) (Details) $ in Thousands |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
May 04, 2017 USD ($) branch | Apr. 03, 2017 USD ($) | Oct. 31, 2017 professional | Sep. 30, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 16, 2016 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Total assets |  |  |  | $ 29,622,636 | $ 29,622,636 |  | $ 28,555,231 |
Capital Bank Financial Corp |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Total assets |  |  |  |  |  | $ 10,000,000 |  |
Number of bank branches operated | branch | 193 |  |  |  |  |  |  |
Expected cash payment to acquire business, gross | $ 411,000 |  |  |  |  |  |  |
Percentage of outstanding common shares (percent) | 29.00% |  |  |  |  |  |  |
Total transaction value | $ 2,200,000 |  |  |  |  |  |  |
GE Capital |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Loans acquired |  |  |  |  |  |  |  | $ 537,400
Coastal Securities |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Payments to acquire business |  | $ 131,473 |  |  |  |  |  |
Goodwill |  | $ 45,000 |  |  |  |  |  |
FHN and Coastal |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Acquisition-related expenses |  |  |  | $ 8,200 | $ 14,600 |  |  |
Subsequent Event | Professional Mortgage Company, Inc. (PMC) [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Number of professionals that joined CRE team | professional |  |  | 11 |  |  |  |  |

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- Definition Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Current Assets Loans Receivable + References No definition available. + Details
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- Definition Amount represents the percentage of FHN common shares held by Capital Bank's (the aquired entity) shareholders subsequent to the acquisition. + References No definition available. + Details
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=73531572&loc=d3e1043-128460 + Details
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