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Loans - Loans by Class Modified as Troubled Debt Restructurings (Detail) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2017 Loans | Sep. 30, 2016 Loans | Sep. 30, 2017 USD ($) Loans | Sep. 30, 2016 Loans | Dec. 31, 2016 Loans
Schedule Of Financial Receivables [Line Items] |  |  |  |  |
Number of Loans | Loans |  |  | 18 |  | 15
Commercial, Industrial, and Agricultural [Member] |  |  |  |  |
Schedule Of Financial Receivables [Line Items] |  |  |  |  |
Number of Loans | Loans |  |  | 8 |  | 7
Commercial Mortgages [Member] |  |  |  |  |
Schedule Of Financial Receivables [Line Items] |  |  |  |  |
Number of Loans | Loans |  |  | 10 |  | 8
Residential Real Estate [Member] |  |  |  |  |
Schedule Of Financial Receivables [Line Items] |  |  |  |  |
Number of Loans | Loans |  |  | 0 |  | 0
Consumer [Member] |  |  |  |  |
Schedule Of Financial Receivables [Line Items] |  |  |  |  |
Number of Loans | Loans |  |  | 0 |  | 0
Credit Cards [Member] |  |  |  |  |
Schedule Of Financial Receivables [Line Items] |  |  |  |  |
Number of Loans | Loans |  |  | 0 |  | 0
Trouble Debt Restructuring [Member] |  |  |  |  |
Schedule Of Financial Receivables [Line Items] |  |  |  |  |
Number of Loans | Loans | 4 | 0 | 4 | 0 |
Pre-Modification Outstanding Recorded Investment | $ |  |  | $ 6,551 |  |
Post-Modification Outstanding Recorded Investment | $ |  |  | $ 6,655 |  |
Trouble Debt Restructuring [Member] | Commercial, Industrial, and Agricultural [Member] |  |  |  |  |
Schedule Of Financial Receivables [Line Items] |  |  |  |  |
Number of Loans | Loans |  |  | 2 |  |
Pre-Modification Outstanding Recorded Investment | $ |  |  | $ 324 |  |
Post-Modification Outstanding Recorded Investment | $ |  |  | $ 379 |  |
Trouble Debt Restructuring [Member] | Commercial Mortgages [Member] |  |  |  |  |
Schedule Of Financial Receivables [Line Items] |  |  |  |  |
Number of Loans | Loans |  |  | 2 |  |
Pre-Modification Outstanding Recorded Investment | $ |  |  | $ 6,227 |  |
Post-Modification Outstanding Recorded Investment | $ |  |  | $ 6,276 |  |
Trouble Debt Restructuring [Member] | Residential Real Estate [Member] |  |  |  |  |
Schedule Of Financial Receivables [Line Items] |  |  |  |  |
Number of Loans | Loans |  |  | 0 |  |
Pre-Modification Outstanding Recorded Investment | $ |  |  | $ 0 |  |
Post-Modification Outstanding Recorded Investment | $ |  |  | $ 0 |  |
Trouble Debt Restructuring [Member] | Consumer [Member] |  |  |  |  |
Schedule Of Financial Receivables [Line Items] |  |  |  |  |
Number of Loans | Loans |  |  | 0 |  |
Pre-Modification Outstanding Recorded Investment | $ |  |  | $ 0 |  |
Post-Modification Outstanding Recorded Investment | $ |  |  | $ 0 |  |
Trouble Debt Restructuring [Member] | Credit Cards [Member] |  |  |  |  |
Schedule Of Financial Receivables [Line Items] |  |  |  |  |
Number of Loans | Loans |  |  | 0 |  |
Pre-Modification Outstanding Recorded Investment | $ |  |  | $ 0 |  |
Post-Modification Outstanding Recorded Investment | $ |  |  | $ 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=84173941&loc=SL6953676-111524 + Details
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