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Fair value estimates - Additional Quantitative Information about Assets Measured at Fair Value on Nonrecurring Basis (Detail) - Nonrecurring Fair Value Measurements [Member] - Significant Unobservable Inputs (Level 3) [Member] - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2015 | Dec. 31, 2014
Other Real Estate Owned [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Assets, Fair Value Estimate | $ 88 | $ 218
Valuation Techniques | Appraisal of collateral | Appraisal of collateral
Unobservable Input | Appraisal adjustments | Appraisal adjustments
Range and weighted average of appraisal adjustments | 53.40% | 30.50%
Range and weighted average of liquidation expenses | 5.00% | 5.00%
Other Real Estate Owned [Member] | Minimum [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Range and weighted average of appraisal adjustments | 20.00% | 19.70%
Range and weighted average of liquidation expenses | 3.00% | 3.00%
Other Real Estate Owned [Member] | Maximum [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Range and weighted average of appraisal adjustments | 73.50% | 47.80%
Range and weighted average of liquidation expenses | 6.00% | 6.00%
Impaired Loans [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Assets, Fair Value Estimate | $ 6,448 | $ 4,414
Valuation Techniques | Appraisal of collateral | Appraisal of collateral
Unobservable Input | Appraisal adjustments | Appraisal Adjustments
Range and weighted average of appraisal adjustments | 24.20% | 24.50%
Range and weighted average of liquidation expenses | 5.40% | 5.50%
Impaired Loans [Member] | Minimum [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Range and weighted average of appraisal adjustments | 14.00% | 2.60%
Range and weighted average of liquidation expenses | 3.00% | 3.00%
Impaired Loans [Member] | Maximum [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Range and weighted average of appraisal adjustments | 63.00% | 61.10%
Range and weighted average of liquidation expenses | 6.00% | 6.00%

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- Definition Represents the range and weighted average of appraisal adjustments presented as a percent of the appraisal. + References No definition available. + Details
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- Definition Represents the range and weighted average of liquidation expenses presented as a percent of the appraisal. + References No definition available. + Details
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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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- 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 Description of the sensitivity of the fair value measurements to changes in unobservable inputs and the inter-relationships between those inputs as well as how those inter-relationships might magnify or mitigate the effect of changes in the unobservable inputs on the fair value measurements. + 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 (g) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Description of the inputs and valuation technique(s) used to measure fair value. + 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 (bbb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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