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Acquisitions and Divestitures (Narrative) (Details) $ in Thousands | 3 Months Ended | 4 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Apr. 03, 2017 USD ($) | May 04, 2017 USD ($) number | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 16, 2016 USD ($)
Business Acquisition [Line Items] |  |  |  |  |
Total assets |  |  | $ 29,618,600 | $ 28,555,231 |
Capital Bank Financial Corp [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Total assets |  |  | $ 10,000,000 |  |
Number Of Bank Branches | number |  | 193 |  |  |
Expected cash payment to acquire business, gross |  | $ 411,000 |  |  |
Estimated Percent Of Common Shares Held By Aquired Entity After Merger |  | 29.00% |  |  |
Aggregate Transaction Value |  | $ 2,200,000 |  |  |
Coastal Securities |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Expected cash payment to acquire business, gross | $ 130,000 |  |  |  |
As Acquired [Member] | GE Capital Member [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Loans acquired |  |  |  |  | $ 537,400

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