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Loans and Leases - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Outstanding loans to Executive officers, directors, principal shareholders, related interest and parties | $ 39,100 |  | $ 39,100 |
Delinquent loans selectively extended to certain borrowers, rate reductions, forbearance of arrears, and extension of maturity dates |  |  |  | $ 5,286
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 | 7,086 | $ 1,212 | 28,179 | 4,386
Loan classified as non accrual TDRs |  | $ 1,100 |  | $ 1,100
Commercial And Industrial Sector And One To Four Family Mortgage Loans [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loan classified as non accrual TDRs | $ 505,000 |  | 505,000 |
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 |  |  | 35,200 |
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 |  |  | $ 8,100 |

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