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Acquisitions and Divestitures - Narrative (Details) $ in Thousands | Nov. 08, 2019 USD ($) branch | Nov. 04, 2019 office state directors | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Apr. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
--- | --- | --- | --- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |  |  |  |
Assets |  |  | $ 47,197,378 | $ 43,310,900 |  |  |
Total loans, net of unearned income and allowance for loan losses |  |  | 32,933,813 | 30,860,804 |  |  |
Deposits |  |  | 34,419,650 | 32,429,535 |  |  |
Goodwill |  |  | 1,432,787 | $ 1,432,787 |  | $ 1,432,787 | $ 1,432,787
Subprime Consumer Loans | Discontinued Operations, Held-for-sale |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Loans disposed of |  |  |  |  | $ 25,000 |  |
IBERIABANK DIRECTORS |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of board of directors | directors |  | 8 |  |  |  |  |
IBERIABANK (IBKC) |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Conversion price of shares |  | 4.584 |  |  |  |  |
Conversion percentage of shares |  | 44.00% |  |  |  |  |
Number of board of directors | directors |  | 17 |  |  |  |  |
IBERIABANK (IBKC) | FHN DIRECTORS |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of board of directors | directors |  | 9 |  |  |  |  |
SunTrust Banks, Inc. Branches |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of bank branches | branch | 30 |  |  |  |  |  |
Loans | $ 410,000 |  |  |  |  |  |
Deposits | $ 2,400,000 |  |  |  |  |  |
Deposits premium percent | 3.40% |  |  |  |  |  |
IBERIABANK (IBKC) |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of offices | office |  | 319 |  |  |  |  |
Number of states | state |  | 12 |  |  |  |  |
Assets |  |  | 32,200,000 |  |  |  |
Total loans, net of unearned income and allowance for loan losses |  |  | 24,500,000 |  |  |  |
Deposits |  |  | $ 25,500,000 |  |  |  |
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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