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Loans - Restructured in Troubled Debt (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2013 Loans | Sep. 30, 2012 Loans | Sep. 30, 2013 Loans | Dec. 31, 2012 Loans
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Loans | 1 | 0 | 12 | 10
Loans Balance | $ 13,255 |  | $ 13,255 | $ 11,621
Specific Reserve | 1,900 |  | 1,900 | 1,099
Commercial, Industrial, and Agricultural [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Loans |  |  | 2 | 2
Loans Balance | 1,302 |  | 1,302 | 1,420
Specific Reserve | 0 |  | 0 | 0
Commercial Mortgages [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Loans |  |  | 10 | 8
Loans Balance | 11,953 |  | 11,953 | 10,201
Specific Reserve | 1,900 |  | 1,900 | 1,099
Residential Real Estate [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Loans |  |  | 0 | 0
Loans Balance | 0 |  | 0 | 0
Specific Reserve | 0 |  | 0 | 0
Consumer [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Loans |  |  | 0 | 0
Loans Balance | 0 |  | 0 | 0
Specific Reserve | 0 |  | 0 | 0
Credit Cards [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Loans |  |  | 0 | 0
Loans Balance | 0 |  | 0 | 0
Specific Reserve | $ 0 |  | $ 0 | $ 0

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- Details
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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=28368275&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=25495931&loc=d3e18845-111554 + Details
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