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Acquisitions and Divestitures - Narrative (Details) $ in Thousands |  |  | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jul. 17, 2020 USD ($) branch | Jul. 01, 2020 USD ($) numberNewPreferredStockSeries office state shares | Sep. 30, 2020 USD ($) shares | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) shares | Sep. 30, 2019 USD ($) | Dec. 31, 2019 USD ($) shares | Apr. 30, 2019 USD ($) | Dec. 31, 2018 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Number of common stock issued | shares |  | 243,000,000 | 554,787,728 |  | 554,787,728 |  | 311,469,056 |  |
Number of new series of preferred stock | numberNewPreferredStockSeries |  | 3 |  |  |  |  |  |  |
Assets |  |  | $ 83,029,579 |  | $ 83,029,579 |  | $ 43,310,900 |  |
Total loans, net of unearned income and allowance for loan losses |  |  | 58,718,429 |  | 58,718,429 |  | 30,860,804 |  |
Securities available for sale at fair value |  |  | 7,995,872 |  | 7,995,872 |  | 4,445,403 |  |
Deposits |  |  | 68,408,907 |  | 68,408,907 |  | 32,429,535 |  |
Goodwill |  |  | 1,510,431 | $ 1,432,787 | 1,510,431 | $ 1,432,787 | $ 1,432,787 |  | $ 1,432,787
Purchase accounting gain |  |  | 532,150 | $ 0 | $ 532,150 | $ 0 |  |  |
Core deposit intangibles |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Finite-lived intangible asset, estimated useful life |  |  |  |  | 10 years |  |  |  |
Subprime Consumer Loans | Discontinued Operations, Held-for-sale |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Loans disposed of |  |  |  |  |  |  |  | $ 25,000 |
IBERIABANK (IBKC) |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Deposits |  |  | 28,231,609 |  | $ 28,231,609 |  |  |  |
Goodwill |  |  | (532,150) |  | (532,150) |  |  |  |
Purchase accounting gain |  | $ 532,200 |  |  |  |  |  |  |
SunTrust Banks, Inc. Branches |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Number of bank branches | branch | 30 |  |  |  |  |  |  |  |
Loans and leases (a) | $ 423,400 |  |  |  |  |  |  |  |
Deposits | $ 2,200,000 |  | 2,194,870 |  | 2,194,870 |  |  |  |
Deposits premium percent | 3.40% |  |  |  |  |  |  |  |
Goodwill |  |  | $ 77,644 |  | $ 77,644 |  |  |  |
IBERIABANK (IBKC) |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Equity interest issued, value assigned |  | $ 2,500,000 |  |  |  |  |  |  |
Number of offices | office |  | 319 |  |  |  |  |  |  |
Number of states | state |  | 12 |  |  |  |  |  |  |
NORTH CAROLINA | SunTrust Banks, Inc. Branches |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Number of bank branches | branch | 20 |  |  |  |  |  |  |  |
VIRGINIA | SunTrust Banks, Inc. Branches |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Number of bank branches | branch | 8 |  |  |  |  |  |  |  |
GEORGIA | SunTrust Banks, Inc. Branches |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Number of bank branches | branch | 2 |  |  |  |  |  |  |  |

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