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Business Combination - Additional Information (Detail) $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 31, 2018 USD ($) | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) Property | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Merger related expenses |  | $ 1,288 | $ 2,030 | $ 8,434 | $ 18,310 | $ 1,259 | $ 3,153 | $ 8,606 | $ 1,480 | $ 26,911 | $ 8,293 | $ 16,534
Ocean Shore Holdings Co. |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Consideration paid | $ 474,930 |  |  |  |  |  |  |  |  |  |  |
Sun Bancorp, Inc. |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Purchase accounting adjustments, assets | 2,044,031 |  |  |  |  |  |  |  |  |  |  |
Purchase accounting adjustments, loans | 1,517,345 |  |  |  |  |  |  |  |  |  |  |
Purchase accounting adjustments, deposits | 1,616,073 |  |  |  |  |  |  |  |  |  |  |
Consideration paid | 474,900 |  |  |  |  |  |  |  |  |  |  |
Cash consideration paid for outstanding warrants and fractional shares | 72,400 |  |  |  |  |  |  |  |  |  |  |
Number of properties in lease agreements | Property |  |  |  |  |  |  |  |  |  | 21 |  |
Core deposit intangible | $ 11,897 |  |  |  |  |  |  |  |  |  |  |

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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e1043-128460 + Details
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