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Business Combinations - Additional Information (Detail) $ in Thousands |  | 9 Months Ended
--- | --- | ---
Jan. 31, 2018 USD ($) | Sep. 30, 2018 Property
Sun Bancorp, Inc. |  |
Business Acquisition [Line Items] |  |
Purchase accounting adjustments, assets | $ 2,042,899 |
Purchase accounting adjustments, loans | 1,517,172 |
Purchase accounting adjustments, deposits | 1,616,073 |
Total consideration paid | 474,930 |
Cash consideration | 72,400 |
Number of properties in lease agreement | Property |  | 21
Core Deposits |  |
Business Acquisition [Line Items] |  |
Acquired finite-lived intangible assets, weighted average useful life |  | 10 years
Core Deposits | Sun Bancorp, Inc. |  |
Business Acquisition [Line Items] |  |
Core deposit intangible | $ 11,897 |

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