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Loans - Restructured in Troubled Debt (Detail) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 USD ($) Loans | Dec. 31, 2015 USD ($) Loans
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | Loans | 15 | 16
Loan Balance | $ 12,072 | $ 14,941
Specific Reserve | $ 2,553 | $ 2,912
Commercial, Industrial, and Agricultural [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | Loans | 7 | 8
Loan Balance | $ 2,710 | $ 5,040
Specific Reserve | $ 128 | $ 887
Commercial Mortgages [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | Loans | 8 | 8
Loan Balance | $ 9,362 | $ 9,901
Specific Reserve | $ 2,425 | $ 2,025
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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