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Loans - Additional Information (Detail) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 USD ($) Investment | Jun. 30, 2017 USD ($) Investment | Jun. 30, 2018 USD ($) Investment | Jun. 30, 2017 USD ($) Investment | Dec. 31, 2017 USD ($)
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Outstanding loans to Executive officers, directors, principal shareholders, related interest and parties | $ 55,600,000 |  | $ 55,600,000 |  |
Loans held for sale | 0 |  | 0 |  | $ 35,258,000
Delinquent loans selectively extended to certain borrowers, rate reductions, forbearance of arrears, and extension of maturity dates |  | $ 19,379,000 | $ 4,074,000 | $ 24,145,000 |
Number of loans classified as a non-accrual TDRs | Investment |  | 16 | 13 | 34 |
Commercial and Industrial |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Delinquent loans selectively extended to certain borrowers, rate reductions, forbearance of arrears, and extension of maturity dates | $ 1,420,000 | $ 18,722,000 | $ 3,174,000 | $ 23,151,000 |
Number of loans classified as a non-accrual TDRs | Investment | 6 | 13 | 12 | 30 |
Commercial and Industrial | Payment Default |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Number of loans classified as a non-accrual TDRs |  |  | 6 |  |
Loan classified as non accrual TDRs | $ 1,700,000 |  | $ 1,700,000 |  |
Principal shareholders |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Outstanding loans to Executive officers, directors, principal shareholders, related interest and parties | $ 0 |  | 0 |  |
Financing Receivable Troubled Debt Restructurings Rate Reductions |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Delinquent loans selectively extended to certain borrowers, rate reductions, forbearance of arrears, and extension of maturity dates |  |  | 39,900,000 |  |
Financing Receivable Troubled Debt Restructurings Forbearance of Arrears |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Delinquent loans selectively extended to certain borrowers, rate reductions, forbearance of arrears, and extension of maturity dates |  |  | $ 1,800,000 |  |

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