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Loans Receivable, Net - Additional Information (Detail) |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) SecurityLoan | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) SecurityLoan | Sep. 30, 2018 USD ($) | Dec. 31, 2018 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Impaired loans on non-accrual commercial real estate, multi-family, land, construction, commercial and industrial loans |  |  |  | $ 250,000 |  |
Impaired loan portfolio total |  | $ 27,817,000 |  | 27,817,000 |  | $ 29,797,000
Allocation in allowance for loan losses |  | 547,000 |  | 547,000 |  | 0
Average balance of impaired loans |  | 28,200,000 | $ 32,900,000 | 30,200,000 | $ 39,200,000 |
Troubled debt restructured loans |  | 25,100,000 |  | 25,100,000 |  | 26,500,000
Loans with non-accrual of interest |  | $ 17,453,000 |  | $ 17,453,000 |  | 17,415,000
Number of residential mortgage loans | SecurityLoan |  | 0 |  | 0 |  |
Non-accrual loan total troubled debt restructurings |  |  |  | $ 6,200,000 |  | 3,600,000
Specific reserves to loans accruing troubled debt restructurings |  | $ 547,000 |  | 547,000 |  | 0
Troubled debt restructured loans with accrual interest |  | 19,000,000.0 |  | 19,000,000.0 |  | 22,900,000
Capital Bank |  |  |  |  |  |
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 |  | 5,953,000 |  | 5,953,000 |  | $ 7,389,000
Recorded investment in mortgage and consumer loans collateralized, foreclosure amount |  | 2,100,000 |  | 2,100,000 |  |
Foreclosed property held |  | $ 81,000 |  | $ 81,000 |  |

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