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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, 2015 USD ($) Loans | Dec. 31, 2014 USD ($) Loans | Dec. 31, 2013 USD ($) Loans
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | Loans | 16 | 16 |
Trouble Debt Restructuring [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | Loans | 1 | 4 | 3
Pre-Modification Outstanding Recorded Investment | $ | $ 1,327 | $ 7,194 | $ 3,747
Post-Modification Outstanding Recorded Investment | $ | $ 1,327 | $ 7,194 | $ 3,681
Commercial, Industrial, and Agricultural [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | Loans | 8 | 7 |
Commercial, Industrial, and Agricultural [Member] | Trouble Debt Restructuring [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | Loans | 1 | 1 | 1
Pre-Modification Outstanding Recorded Investment | $ | $ 1,327 | $ 2,315 | $ 132
Post-Modification Outstanding Recorded Investment | $ | $ 1,327 | $ 2,315 | $ 132
Commercial Mortgages [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | Loans | 8 | 9 |
Commercial Mortgages [Member] | Trouble Debt Restructuring [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | Loans | 0 | 3 | 2
Pre-Modification Outstanding Recorded Investment | $ | $ 0 | $ 4,879 | $ 3,615
Post-Modification Outstanding Recorded Investment | $ | $ 0 | $ 4,879 | $ 3,549
Residential Real Estate [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | Loans | 0 | 0 |
Residential Real Estate [Member] | Trouble Debt Restructuring [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | Loans | 0 | 0 | 0
Pre-Modification Outstanding Recorded Investment | $ | $ 0 | $ 0 | $ 0
Post-Modification Outstanding Recorded Investment | $ | $ 0 | $ 0 | $ 0
Consumer [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | Loans | 0 | 0 |
Consumer [Member] | Trouble Debt Restructuring [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | Loans | 0 | 0 | 0
Pre-Modification Outstanding Recorded Investment | $ | $ 0 | $ 0 | $ 0
Post-Modification Outstanding Recorded Investment | $ | $ 0 | $ 0 | $ 0
Credit Cards [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | Loans | 0 | 0 |
Credit Cards [Member] | Trouble Debt Restructuring [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | Loans | 0 | 0 | 0
Pre-Modification Outstanding Recorded Investment | $ | $ 0 | $ 0 | $ 0
Post-Modification Outstanding Recorded Investment | $ | $ 0 | $ 0 | $ 0

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