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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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