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Loans - Additional Information (Detail) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 USD ($) Investment | Sep. 30, 2017 USD ($) Investment | Sep. 30, 2018 USD ($) Investment | Sep. 30, 2017 USD ($) Investment | Dec. 31, 2017 USD ($)
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Outstanding loans to Executive officers, directors, principal shareholders, related interest and parties | $ 55,300,000 |  | $ 55,300,000 |  |
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 |  | $ 16,272,000 | $ 5,286,000 | $ 33,315,000 |
Number of loans classified as a non-accrual TDRs | Investment |  | 24 | 19 | 58 |
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 | $ 1,212,000 | $ 7,620,000 | $ 4,386,000 | $ 23,673,000 |
Number of loans classified as a non-accrual TDRs | Investment | 6 | 22 | 18 | 52 |
Commercial and Industrial | Payment Default |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Number of loans classified as a non-accrual TDRs | Investment |  |  | 5 |  |
Loan classified as non accrual TDRs | $ 1,100,000 |  | $ 1,100,000 |  |
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 |  |  | 38,700,000 |  |
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 |  |  | $ 1,400,000 |  |

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