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Loans - Schedule of Loan Assigned Risk Rating within 12 Months of Balance Sheet Date (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Financing receivable recorded investment | $ 564,729 | $ 518,882
Commercial, Industrial, and Agricultural [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing receivable recorded investment | 258,889 | 257,091
Commercial Mortgages [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing receivable recorded investment | 305,840 | 261,791
Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing receivable recorded investment | 493,527 | 460,129
Pass [Member] | Commercial, Industrial, and Agricultural [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing receivable recorded investment | 230,412 | 234,835
Pass [Member] | Commercial Mortgages [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing receivable recorded investment | 263,115 | 225,294
Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing receivable recorded investment | 16,953 | 18,935
Special Mention [Member] | Commercial, Industrial, and Agricultural [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing receivable recorded investment | 6,997 | 6,641
Special Mention [Member] | Commercial Mortgages [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing receivable recorded investment | 9,956 | 12,294
Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing receivable recorded investment | 51,389 | 38,960
Substandard [Member] | Commercial, Industrial, and Agricultural [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing receivable recorded investment | 21,349 | 15,459
Substandard [Member] | Commercial Mortgages [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing receivable recorded investment | 30,040 | 23,501
Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing receivable recorded investment | 2,860 | 858
Doubtful [Member] | Commercial, Industrial, and Agricultural [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing receivable recorded investment | 131 | 156
Doubtful [Member] | Commercial Mortgages [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing receivable recorded investment | $ 2,729 | $ 702

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- Definition Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Article 5 + Details
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