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Acquisitions and Divestitures - Merger and Integration Expenses (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Business Acquisition [Line Items] |  |
Merger and integration expense | $ 4,172 | $ 5,660
Professional fees |  |
Business Acquisition [Line Items] |  |
Merger and integration expense | 799 | 1,867
Employee compensation, incentives and benefits |  |
Business Acquisition [Line Items] |  |
Merger and integration expense | 396 | 1,517
Contract employment and outsourcing |  |
Business Acquisition [Line Items] |  |
Merger and integration expense | 306 | 0
Occupancy |  |
Business Acquisition [Line Items] |  |
Merger and integration expense | (25) | 118
Miscellaneous expense |  |
Business Acquisition [Line Items] |  |
Merger and integration expense | 822 | 1,069
All other expense |  |
Business Acquisition [Line Items] |  |
Merger and integration expense | 1,874 | $ 1,089
IBERIABANK (IBKC) |  |
Business Acquisition [Line Items] |  |
Merger and integration expense | 1,605 |
IBERIABANK (IBKC) | Professional fees |  |
Business Acquisition [Line Items] |  |
Merger and integration expense | 662 |
IBERIABANK (IBKC) | Employee compensation, incentives and benefits |  |
Business Acquisition [Line Items] |  |
Merger and integration expense | 689 |
IBERIABANK (IBKC) | Miscellaneous expense |  |
Business Acquisition [Line Items] |  |
Merger and integration expense | $ 254 |

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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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