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Income Taxes - Additional Information (Detail) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Operating Loss Carryforwards [Line Items] |  |  |
Unrealized gains (loss) on securities, tax expense | $ 1,100,000 | $ 276,000 | $ 330,000
Share-based compensation, excess tax benefit, amount |  | 1,800,000 |
Income tax benefit (expense) attributable to stock plans prior to ASU adoption |  |  | (62,000)
Purchase accounting adjustments | 59,110,000 | 3,436,000 |
Retained earnings not provided for provision for income tax | 10,800,000 |  |
Unrecognized deferred tax liability | 2,300,000 |  |
Unrecognized tax benefits | 0 | 0 | $ 0
Tax Cuts and Jobs Act of 2017, change in tax rate, income tax expense (benefit) | 1,900,000 | 3,600,000 |
Colonial American Bank |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating loss carryforwards | 5,300,000 | 5,900,000 |
Operating loss carryforwards, subject to expiration | 330,000 |  |
Cape Bancorp, Inc. |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating loss carryforwards | 6,100,000 | 10,500,000 |
Operating loss carryforwards, subject to expiration | 4,500,000 |  |
Tax credit | 1,000,000 | 1,000,000 |
Sun Bancorp, Inc. |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Purchase accounting adjustments | 57,600,000 |  |
Operating loss carryforwards | 218,900,000 |  |
Operating loss carryforwards, subject to expiration | 9,300,000 |  |
New Jersey |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Tax credit | 1,800,000 | $ 1,800,000 |
Other Comprehensive Income |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Tax Cuts and Jobs Act of 2017, change in tax rate, income tax expense (benefit) | 1,800,000 |  |
Accumulated Other Comprehensive (Loss) Gain |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Tax Cuts and Jobs Act of 2017, change in tax rate, income tax expense (benefit) | $ 1,200,000 |  |

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