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Acquisitions and Divestitures - Pro Forma (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Business Acquisition [Line Items] |  |  |  |
Net interest income, Actual | $ 222,912 |  |  |
Non-interest income, Actual | 89,510 |  |  |
Net interest income | (41,750) |  |  |
IBERIABANK (IBKC) |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Net interest income | 550,636 | $ 566,174 | $ 1,691,623 | $ 1,711,502
Noninterest income | 290,773 | 235,409 | 783,132 | 645,781
Net income (loss) | $ 71,162 | $ 218,572 | $ 359,214 | $ 654,884

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- Definition The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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