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Acquisitions and Divestitures - Merger and Integration Expenses (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
IBERIABANK Corporation |  |  |
Business Acquisition [Line Items] |  |  |
Merger and integration expense | $ 11,371 |  |
IBERIABANK Corporation | Professional fees |  |  |
Business Acquisition [Line Items] |  |  |
Merger and integration expense | 8,228 |  |
IBERIABANK Corporation | Employee compensation, incentives and benefits |  |  |
Business Acquisition [Line Items] |  |  |
Merger and integration expense | 3,079 |  |
IBERIABANK Corporation | Miscellaneous expense |  |  |
Business Acquisition [Line Items] |  |  |
Merger and integration expense | 64 |  |
Capital Bank Financial Corporation |  |  |
Business Acquisition [Line Items] |  |  |
Merger and integration expense | 22,870 | $ 92,393 | $ 56,748
Capital Bank Financial Corporation | Professional fees |  |  |
Business Acquisition [Line Items] |  |  |
Merger and integration expense | 11,221 | 22,337 | 28,151
Capital Bank Financial Corporation | Employee compensation, incentives and benefits |  |  |
Business Acquisition [Line Items] |  |  |
Merger and integration expense | 1,189 | 9,613 | 17,077
Capital Bank Financial Corporation | Contract employment and outsourcing |  |  |
Business Acquisition [Line Items] |  |  |
Merger and integration expense | 240 | 3,681 | 1,270
Capital Bank Financial Corporation | Occupancy |  |  |
Business Acquisition [Line Items] |  |  |
Merger and integration expense | 1,453 | 5,236 | 15
Capital Bank Financial Corporation | Miscellaneous expense |  |  |
Business Acquisition [Line Items] |  |  |
Merger and integration expense | 2,072 | 7,652 | 1,291
Capital Bank Financial Corporation | All other expense |  |  |
Business Acquisition [Line Items] |  |  |
Merger and integration expense | $ 6,695 | $ 43,874 | $ 8,944

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