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Acquisitions and Divestitures - Merger and Integration Expenses (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Business Acquisition [Line Items] |  |  |  |
Merger and integration expense | $ 4,865 | $ 8,647 | $ 9,037 | $ 14,307
Professional fees |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Merger and integration expense | 1,327 | 4,478 | 2,126 | 6,345
Employee compensation, incentives and benefits |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Merger and integration expense | 87 | 1,472 | 483 | 2,989
Contract employment and outsourcing |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Merger and integration expense | 420 | 17 | 726 | 17
Occupancy |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Merger and integration expense | (82) | 1,505 | (107) | 1,623
Miscellaneous expense |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Merger and integration expense | 503 | 79 | 1,325 | 1,148
All other expense |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Merger and integration expense | 2,610 | $ 1,096 | 4,484 | $ 2,185
IBERIABANK (IBKC) |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Merger and integration expense | 9,456 |  | 11,061 |
IBERIABANK (IBKC) | Professional fees |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Merger and integration expense | 3,748 |  | 4,410 |
IBERIABANK (IBKC) | Employee compensation, incentives and benefits |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Merger and integration expense | 4,705 |  | 5,394 |
IBERIABANK (IBKC) | Miscellaneous expense |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Merger and integration expense | $ 1,003 |  | $ 1,257 |

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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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