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Loans Receivable, Net - Additional Information (Detail) |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
May 02, 2016 USD ($) | Sep. 30, 2018 USD ($) SecurityLoan | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) SecurityLoan | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans with non-accrual of interest |  | $ 19,239,000 |  | $ 19,239,000 |  | $ 20,865,000
Number of residential mortgage loans | SecurityLoan |  | 0 |  | 0 |  |
Impaired loans on non-accrual commercial real estate, multi-family, land, construction, commercial and industrial loans |  |  |  | $ 250,000 |  |
Impaired loan portfolio total |  | $ 33,088,000 |  | 33,088,000 |  | 46,988,000
Allocation in allowance for loan losses |  | 0 |  | 0 |  | 0
Average balance of impaired loans |  | 32,900,000 | $ 43,100,000 | 39,200,000 | $ 38,000,000 |
Troubled debt restructured loans |  | 27,800,000 |  | 27,800,000 |  | 42,100,000
Troubled debt restructured loans with accrual interest |  | 24,200,000 |  | 24,200,000 |  | 33,300,000
Non-accrual loan total troubled debt restructurings |  |  |  | 3,568,000 |  | 8,800,000
Specific reserves to loans accruing troubled debt restructurings |  | 0 |  | 0 |  |
Sun Bancorp, Inc. |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for loan and lease losses, loans acquired | $ 0 |  |  |  |  |
Residential Real Estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans with non-accrual of interest |  | 6,390,000 |  | 6,390,000 |  | $ 4,190,000
Recorded investment in mortgage and consumer loans collateralized, foreclosure amount |  | 2,100,000 |  | 2,100,000 |  |
Foreclosed property held |  | $ 447,000 |  | $ 447,000 |  |

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