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Acquisitions and Divestitures (Narrative) (Details) $ in Thousands |  | 3 Months Ended | 4 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Apr. 03, 2017 USD ($) | Jun. 30, 2016 USD ($) | May 04, 2017 USD ($) branch | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 16, 2016 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |
Total assets |  |  |  | $ 29,369,956 |  | $ 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 Member |  |  |  |  |  |  |
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 |  | $ 6,400 |  |  |  |  |

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