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Loans and Leases - Additional Information (Detail) - USD ($) | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Financing Receivable, Recorded Investment [Line Items] |  |
Outstanding loans to Executive officers, directors, principal shareholders, related interest and parties | $ 35,000,000 |
Delinquent loans selectively extended to certain borrowers, rate reductions, forbearance of arrears, and extension of maturity dates |  | $ 2,654,000
Direct Financing Lease, Lease Income | 7,300,000 |
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 | 3,088,000 | 1,754,000
Loan classified as non accrual TDRs | 566,000 | $ 2,900,000
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 | 34,600,000 |
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 | $ 37,000 |

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