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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], USD $) In Thousands, unless otherwise specified | 9 Months Ended |
--- | --- | ---
Sep. 30, 2014 | Dec. 31, 2013
Other Real Estate Owned [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Range and weighted average of appraisal adjustments | 20.70% | 20.70%
Range and weighted average of liquidation expenses | 4.40% | 4.40%
Other Real Estate Owned [Member] | Minimum [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Range and weighted average of appraisal adjustments | 17.00% | 17.00%
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 | 24.00% | 24.00%
Range and weighted average of liquidation expenses | 6.00% | 6.00%
Impaired Loans [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Range and weighted average of appraisal adjustments | 22.90% | 17.30%
Range and weighted average of liquidation expenses | 5.60% | 5.00%
Impaired Loans [Member] | Minimum [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Range and weighted average of appraisal adjustments | 2.60% | 11.00%
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 | 74.00% | 33.70%
Range and weighted average of liquidation expenses | 6.00% | 6.00%
Significant Unobservable Inputs (Level 3) [Member] | Other Real Estate Owned [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Assets, Fair Value Estimate | $ 285 | $ 437
Valuation Techniques | Appraisal of collateral |
Unobservable Input | Appraisal adjustments |
Significant Unobservable Inputs (Level 3) [Member] | Impaired Loans [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Assets, Fair Value Estimate | $ 1,826 | $ 2,354
Valuation Techniques | Appraisal of collateral |
Unobservable Input | Appraisal adjustments |

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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 disclosure of unobservable input used for assets fair value measurement at the end of the period. + References No definition available. + Details
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- Definition The technique used by the entity to measure fair value of assets at the end of the period. + 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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- Details
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