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Fair Value of Financial Instruments - Balances of Impaired Loans and OREO Measured at Fair Value on Nonrecurring Basis (Detail) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
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Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial assets measured at fair value | $ 14 | $ 68
Non-Recurring Fair Value Measurements [Member] | Impaired Loans [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial assets measured at fair value | 3,988 | 1,456
Non-Recurring Fair Value Measurements [Member] | Impaired Loans [Member] | Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial assets measured at fair value | 3,988 | 1,456
Non-Recurring Fair Value Measurements [Member] | OREO [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial assets measured at fair value | 7,168 | 7,735
Non-Recurring Fair Value Measurements [Member] | OREO [Member] | Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial assets measured at fair value | $ 7,168 | $ 7,735

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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