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Loans - Schedule of Loan Assigned Risk Rating within 12 Months of Balance Sheet Date (Detail) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Financing receivable recorded investment | $ 872,768 | $ 781,210
Commercial, Industrial, and Agricultural [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing receivable recorded investment | 450,969 | 428,458
Commercial Mortgages [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing receivable recorded investment | 421,799 | 352,752
Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing receivable recorded investment | 828,424 | 731,537
Pass [Member] | Commercial, Industrial, and Agricultural [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing receivable recorded investment | 423,173 | 402,923
Pass [Member] | Commercial Mortgages [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing receivable recorded investment | 405,251 | 328,614
Special Mention [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing receivable recorded investment | 4,438 | 6,703
Special Mention [Member] | Commercial, Industrial, and Agricultural [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing receivable recorded investment | 4,438 | 6,703
Special Mention [Member] | Commercial Mortgages [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing receivable recorded investment | 0 | 0
Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing receivable recorded investment | 39,254 | 42,224
Substandard [Member] | Commercial, Industrial, and Agricultural [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing receivable recorded investment | 23,134 | 18,525
Substandard [Member] | Commercial Mortgages [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing receivable recorded investment | 16,120 | 23,699
Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing receivable recorded investment | 652 | 746
Doubtful [Member] | Commercial, Industrial, and Agricultural [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing receivable recorded investment | 224 | 307
Doubtful [Member] | Commercial Mortgages [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing receivable recorded investment | $ 428 | $ 439

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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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 + Details
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