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Acquisitions and Divestitures - Narrative (Details) $ in Thousands |  |  |  | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 23, 2018 USD ($) branch | Nov. 30, 2017 USD ($) branch shares | Apr. 03, 2017 USD ($) | Jun. 30, 2018 USD ($) shares | Sep. 30, 2018 USD ($) branch | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Dec. 31, 2016 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | $ 1,409,822 | $ 1,386,853 | $ 236,335 | $ 191,371
Number of branches divested | branch |  |  |  |  | 2 |  |  |
Deposits disposed of |  |  |  |  |  | $ 22,600 |  |
Portion of Sub-prime Auto Loan Portfolios |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Loans disposed of |  |  |  | $ 120,000 | $ 120,000 |  |  |
Apex Bank |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Number of branches divested | branch | 2 |  |  |  |  |  |  |
Deposits disposed of | $ 30,000 |  |  |  |  |  |  |
Loans disposed of | $ 2,000 |  |  |  |  |  |  |
Capital Bank Financial Corporation |  |  |  |  |  |  |  |
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 | 469,609 |  |  |
Business combination, consideration transferred |  | $ 2,200,000 |  |  | 2,216,333 |  |  |
Business acquisition, number of shares canceled (in shares) | shares |  |  |  | 2,373,220 |  |  |  |
Number of bank branches | branch |  | 178 |  |  |  |  |  |
Assets acquired |  | $ 9,900,000 |  |  | 9,857,979 |  |  |
Loans |  | 7,300,000 |  |  | 7,276,544 |  |  |
Securities available-for-sale |  | 1,200,000 |  |  | 1,193,393 |  |  |
Deposits |  | $ 8,100,000 |  |  | 8,140,102 |  |  |
Goodwill |  |  |  |  | 1,169,874 |  |  |
Loans held-for-sale |  |  |  |  | 124,918 |  |  |
Trading securities |  |  |  |  | 0 |  |  |
Securities sold under agreements to repurchase |  |  |  |  | $ 26,664 |  |  |
Coastal Securities, Inc |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Payments to acquire businesses |  |  | $ 131,000 |  |  |  |  |
Assets acquired |  |  | 418,000 |  |  |  |  |
Goodwill |  |  | 45,000 |  |  |  |  |
Loans held-for-sale |  |  | 236,000 |  |  |  |  |
Trading securities |  |  | 139,000 |  |  |  |  |
Securities sold under agreements to repurchase |  |  | 202,000 |  |  |  |  |
Fixed income payables |  |  | $ 96,000 |  |  |  |  |

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