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Acquisitions and Divestitures - Merger and Integration Expenses (Details) - Capital Bank Financial Corporation - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Business Acquisition [Line Items] |  |
Merger and integration expense | $ 92,393 | $ 56,748
Professional fees |  |
Business Acquisition [Line Items] |  |
Merger and integration expense | 22,337 | 28,151
Employee compensation, incentives and benefits |  |
Business Acquisition [Line Items] |  |
Merger and integration expense | 9,613 | 17,077
Contract employment and outsourcing |  |
Business Acquisition [Line Items] |  |
Merger and integration expense | 3,681 | 1,270
Occupancy |  |
Business Acquisition [Line Items] |  |
Merger and integration expense | 5,236 | 15
Miscellaneous expense |  |
Business Acquisition [Line Items] |  |
Merger and integration expense | 7,652 | 1,291
All other expense |  |
Business Acquisition [Line Items] |  |
Merger and integration expense | $ 43,874 | $ 8,944

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- Definition Costs incurred to effect a business combination which have been expensed during the period. Such costs could include business integration costs, systems integration and conversion costs, and severance and other employee-related costs. + References No definition available. + Details
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