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Fair value estimates - Schedule of Assets and Liabilities Measured at Fair Value on Nonrecurring Basis (Detail) - Nonrecurring Fair Value Measurements [Member] - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Impaired loans | $ 6,448 | $ 4,414
Other real estate owned | 88 | 218
Significant Unobservable Inputs (Level 3) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Impaired loans | 6,448 | 4,414
Other real estate owned | $ 88 | $ 218

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- Definition Fair value disclosure of impaired loans at the end of the period. + References No definition available. + Details
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- Definition Fair value disclosure of other real estate owned at the end of the period. + References No definition available. + Details
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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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