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Income Taxes - Additional Information (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Operating Loss Carryforwards [Line Items] |  |  |  |
Unrealized gains (loss) on securities, tax expense | $ 721,000 | $ 874,000 | $ 1,100,000 |
Purchase accounting adjustments | (602,000) | 8,475,000 |  |
Retained earnings not provided for provision for income tax | 10,800,000 |  |  |
Unrecognized deferred tax liability | 2,800,000 |  |  |
Unrecognized tax benefits | 0 | 0 | 0 |
Income tax benefit from revaluation of state deferred tax assets |  | 2,200,000 |  |
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 | 4,600,000 | 4,900,000 |  |
Operating loss carryforwards, subject to expiration | 330,000 |  |  |
Cape Bancorp, Inc. |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Tax credit | 0 | 1,000,000.0 |  |
Sun Bancorp, Inc. |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Purchase accounting adjustments | 4,500,000 |  |  |
Operating loss carryforwards | 152,600,000 | 175,900,000 |  |
Operating loss carryforwards, subject to expiration | 23,300,000 | 9,300,000 |  |
Tax credit | 2,300,000 | 2,300,000 |  |
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) | $ 786,000 |  |  |

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