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Loans - Restructured in Troubled Debt (Detail) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 USD ($) Loans | Dec. 31, 2016 USD ($) Loans
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | Loans | 18 | 15
Loan Balance | $ 17,508 | $ 11,831
Specific Reserve | $ 4,028 | $ 2,339
Commercial, Industrial, and Agricultural [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | Loans | 8 | 7
Loan Balance | $ 2,881 | $ 2,640
Specific Reserve | $ 120 | $ 125
Commercial Mortgages [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | Loans | 10 | 8
Loan Balance | $ 14,627 | $ 9,191
Specific Reserve | $ 3,908 | $ 2,214
Residential Real Estate [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | Loans | 0 | 0
Loan Balance | $ 0 | $ 0
Specific Reserve | $ 0 | $ 0
Consumer [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | Loans | 0 | 0
Loan Balance | $ 0 | $ 0
Specific Reserve | $ 0 | $ 0
Credit Cards [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | Loans | 0 | 0
Loan Balance | $ 0 | $ 0
Specific Reserve | $ 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=84173941&loc=SL6953676-111524 + Details
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- Definition The amount of the outstanding recorded investment related to 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 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=82895541&loc=d3e18845-111554 + Details
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