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Acquisitions and Divestitures - Merger and Integration Expenses (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
IBERIABANK (IBKC) |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Merger and integration expense | $ 95,968 |  | $ 107,029 |
IBERIABANK (IBKC) | Legal and professional fees |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Merger and integration expense | 29,984 |  | 34,394 |
IBERIABANK (IBKC) | Personal expense |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Merger and integration expense | 34,846 |  | 40,240 |
IBERIABANK (IBKC) | Contribution expense |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Merger and integration expense | 20,000 |  | 20,000 |
IBERIABANK (IBKC) | Miscellaneous expense |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Merger and integration expense | 11,138 |  | 12,395 |
SunTrust Banks, Inc. Branches |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Merger and integration expense | 4,825 | $ 8,989 | 13,862 | $ 23,296
SunTrust Banks, Inc. Branches | Legal and professional fees |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Merger and integration expense | 1,196 | 3,507 | 3,322 | 9,852
SunTrust Banks, Inc. Branches | Personal expense |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Merger and integration expense | 303 | 1,473 | 786 | 4,462
SunTrust Banks, Inc. Branches | Contract employment and outsourcing |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Merger and integration expense | 203 | 223 | 929 | 240
SunTrust Banks, Inc. Branches | Net occupancy expense |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Merger and integration expense | 449 | (76) | 342 | 1,547
SunTrust Banks, Inc. Branches | Miscellaneous expense |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Merger and integration expense | 951 | 1,022 | 2,276 | 2,170
SunTrust Banks, Inc. Branches | All other expense |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Merger and integration expense | $ 1,723 | $ 2,840 | $ 6,207 | $ 5,025

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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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