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Acquisitions and Divestitures (Pro Forma) (Details) - Capital Bank Financial Corporation - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Business Acquisition [Line Items] |  |
Actual from acquisition date, Net interest income | $ 31,253 |
Actual from acquisition date, Noninterest income | 6,192 |
Actual from acquisition date, Pre-tax income | 16,534 |
Unaudited Pro Forma, Net interest income | 1,165,006 | $ 1,033,218
Unaudited Pro Forma, Noninterest income | 563,581 | 638,493
Unaudited Pro Forma, Pre-tax income | 476,911 | 458,667
Unaudited Pro Forma, Net income available to common shareholders | $ 274,416 | $ 293,981

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- Definition The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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