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Loans - Restructured in Troubled Debt (Detail) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 USD ($) Loans | Dec. 31, 2015 USD ($) Loans
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | Loans | 15 | 16
Loan Balance | $ 11,831 | $ 14,941
Specific Reserve | $ 2,339 | $ 2,912
Commercial, Industrial, and Agricultural [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | Loans | 7 | 8
Loan Balance | $ 2,640 | $ 5,040
Specific Reserve | $ 125 | $ 887
Commercial Mortgages [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | Loans | 8 | 8
Loan Balance | $ 9,191 | $ 9,901
Specific Reserve | $ 2,214 | $ 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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- 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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