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Acquisitions and Divestitures - Narrative (Details) $ in Thousands |  |  | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 23, 2018 USD ($) branch | Nov. 30, 2017 USD ($) branch shares | Jun. 30, 2018 USD ($) shares | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill |  |  | $ 1,409,276 | $ 1,432,787 |  | $ 1,432,787 | $ 1,386,853
Capital Bank Financial Corp |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Business acquisition, equity interest issued or issuable, number of shares (in shares) | shares |  | 92,042,232 |  |  |  |  |
Payments to acquire businesses |  | $ 423,600 | $ 46,000 |  |  |  |
Business combination, consideration transferred |  | $ 2,200,000 |  |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares Canceled | shares |  |  | 2,373,220 |  |  |  |
Number of bank branches | branch |  | 178 |  |  |  |  |
Assets acquired |  | $ 9,900,000 |  |  |  |  |
Loans |  | 7,300,000 |  |  |  |  |
Securities available-for-sale |  | 1,200,000 |  |  |  |  |
Deposits |  | 8,100,000 |  |  |  |  |
Goodwill |  | $ 1,200,000 |  |  |  |  |
Apex Bank |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of branches divested | branch | 2 |  |  |  |  |  |
Deposits disposed of | $ 30,000 |  |  |  |  |  |
Loans disposed of | $ 2,000 |  |  |  |  |  |
Portion of Sub-prime Auto Loan Portfolios |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Loans disposed of |  |  | $ 120,000 |  |  |  |
Portion of Sub-prime Auto Loan Portfolios | Discontinued Operations, Disposed of by Sale |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Loans disposed of |  |  | $ 120,000 |  |  |  |
Subprime Consumer Loans | Discontinued Operations, Held-for-sale |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Loans disposed of |  |  |  |  | $ 25,000 |  |

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