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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, 2016 USD ($) Loans | Dec. 31, 2015 USD ($) Loans | Dec. 31, 2014 USD ($) Loans
Financing Receivable, Impaired [Line Items] |  |  |
Number of Loans | Loans | 15 | 16 |
Commercial, Industrial, and Agricultural [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Number of Loans | Loans | 7 | 8 |
Commercial Mortgages [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Number of Loans | Loans | 8 | 8 |
Residential Real Estate [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Number of Loans | Loans | 0 | 0 |
Consumer [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Number of Loans | Loans | 0 | 0 |
Credit Cards [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Number of Loans | Loans | 0 | 0 |
Trouble Debt Restructuring [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Number of Loans | Loans | 1 | 1 | 4
Pre-Modification Outstanding Recorded Investment | $ | $ 109 | $ 1,327 | $ 7,194
Post-Modification Outstanding Recorded Investment | $ | $ 109 | $ 1,327 | $ 7,194
Trouble Debt Restructuring [Member] | Commercial, Industrial, and Agricultural [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Number of Loans | Loans | 1 | 1 | 1
Pre-Modification Outstanding Recorded Investment | $ | $ 109 | $ 1,327 | $ 2,315
Post-Modification Outstanding Recorded Investment | $ | $ 109 | $ 1,327 | $ 2,315
Trouble Debt Restructuring [Member] | Commercial Mortgages [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Number of Loans | Loans | 0 | 0 | 3
Pre-Modification Outstanding Recorded Investment | $ | $ 0 | $ 0 | $ 4,879
Post-Modification Outstanding Recorded Investment | $ | $ 0 | $ 0 | $ 4,879
Trouble Debt Restructuring [Member] | Residential Real Estate [Member] |  |  |
Financing Receivable, Impaired [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
Trouble Debt Restructuring [Member] | Consumer [Member] |  |  |
Financing Receivable, Impaired [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
Trouble Debt Restructuring [Member] | Credit Cards [Member] |  |  |
Financing Receivable, Impaired [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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- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953676-111524 + Details
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