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Loans and Leases - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items] |  |  |
Outstanding loans to Executive officers, directors, principal shareholders, related interest and parties | $ 38,200 |  |
Delinquent loans selectively extended to certain borrowers, rate reductions, forbearance of arrears, and extension of maturity dates | 30,816 | $ 6,355 | $ 36,047
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 | 30,685 | $ 5,455 | $ 26,409
Loan classified as non accrual TDRs | 194,000,000 |  |
Commercial And Industrial Sector And One To Four Family Mortgage Loans [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Loan classified as non accrual TDRs | 1,100 |  |
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 | 32,700 |  |
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 | $ 7,800 |  |

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