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Acquisitions - Consideration Paid and Allocation of Purchase Price to Net Assets Acquired (Details) - USD ($) | Jun. 16, 2017 | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Allocation of total consideration paid: |  |  |
Goodwill |  | $ 1,808,300,000 | $ 1,808,002,000
BNC Bancorp |  |  |
Equity consideration: |  |  |
Total equity consideration | $ 1,858,133,000 |  |
Non-equity consideration: |  |  |
Cash paid to redeem common stock | 129,000 |  |
Allocation of total consideration paid: |  |  |
Fair value of net assets assumed including identifiable intangible assets | 601,509,000 |  |
Goodwill | 1,256,753,000 |  |
Total consideration paid | $ 1,858,262,000 |  |
BNC Bancorp | Common Stock |  |  |
Equity consideration: |  |  |
Common stock issued (in shares) | 27,687,100 |  |
Total equity consideration | $ 1,858,133,000 |  |

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