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Loans - Loans by Class Modified as Troubled Debt Restructurings (Detail) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 USD ($) loan | Dec. 31, 2017 USD ($) loan | Dec. 31, 2016 USD ($) loan
Schedule Of Financial Receivables [Line Items] |  |  |
Number of Loans | loan | 25 | 20 |
Commercial, industrial, and agricultural |  |  |
Schedule Of Financial Receivables [Line Items] |  |  |
Number of Loans | loan | 10 | 11 |
Commercial mortgages |  |  |
Schedule Of Financial Receivables [Line Items] |  |  |
Number of Loans | loan | 15 | 9 |
Residential real estate |  |  |
Schedule Of Financial Receivables [Line Items] |  |  |
Number of Loans | loan | 0 | 0 |
Consumer |  |  |
Schedule Of Financial Receivables [Line Items] |  |  |
Number of Loans | loan | 0 | 0 |
Credit cards |  |  |
Schedule Of Financial Receivables [Line Items] |  |  |
Number of Loans | loan | 0 | 0 |
Trouble Debt Restructuring |  |  |
Schedule Of Financial Receivables [Line Items] |  |  |
Number of Loans | loan | 5 | 6 | 1
Pre-Modification Outstanding Recorded Investment | $ | $ 1,570 | $ 9,171 | $ 109
Post-Modification Outstanding Recorded Investment | $ | $ 1,570 | $ 9,171 | $ 109
Trouble Debt Restructuring | Commercial, industrial, and agricultural |  |  |
Schedule Of Financial Receivables [Line Items] |  |  |
Number of Loans | loan | 0 | 4 | 1
Pre-Modification Outstanding Recorded Investment | $ | $ 0 | $ 2,750 | $ 109
Post-Modification Outstanding Recorded Investment | $ | $ 0 | $ 2,750 | $ 109
Trouble Debt Restructuring | Commercial mortgages |  |  |
Schedule Of Financial Receivables [Line Items] |  |  |
Number of Loans | loan | 5 | 2 | 0
Pre-Modification Outstanding Recorded Investment | $ | $ 1,570 | $ 6,421 | $ 0
Post-Modification Outstanding Recorded Investment | $ | $ 1,570 | $ 6,421 | $ 0
Trouble Debt Restructuring | Residential real estate |  |  |
Schedule Of Financial Receivables [Line Items] |  |  |
Number of Loans | loan | 0 | 0 | 0
Pre-Modification Outstanding Recorded Investment | $ | $ 0 | $ 0 | $ 0
Post-Modification Outstanding Recorded Investment | $ | $ 0 | $ 0 | $ 0
Trouble Debt Restructuring | Consumer |  |  |
Schedule Of Financial Receivables [Line Items] |  |  |
Number of Loans | loan | 0 | 0 | 0
Pre-Modification Outstanding Recorded Investment | $ | $ 0 | $ 0 | $ 0
Post-Modification Outstanding Recorded Investment | $ | $ 0 | $ 0 | $ 0
Trouble Debt Restructuring | Credit cards |  |  |
Schedule Of Financial Receivables [Line Items] |  |  |
Number of Loans | loan | 0 | 0 | 0
Pre-Modification Outstanding Recorded Investment | $ | $ 0 | $ 0 | $ 0
Post-Modification Outstanding Recorded Investment | $ | $ 0 | $ 0 | $ 0

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