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Fair value of financial instruments - Additional Quantitative Information about Assets Measured at Fair Value on Nonrecurring Basis (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
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Impaired Loans [Member] | Minimum [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Range and weighted average of appraisal adjustments (in hundredths) | 11.00% | 11.00%
Range and weighted average of liquidation expenses (in hundredths) | 3.00% | 3.00%
Impaired Loans [Member] | Maximum [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Range and weighted average of appraisal adjustments (in hundredths) | 33.70% | 33.70%
Range and weighted average of liquidation expenses (in hundredths) | 6.00% | 6.00%
Impaired Loans [Member] | Weighted Average [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Range and weighted average of appraisal adjustments (in hundredths) | 17.30% | 17.30%
Range and weighted average of liquidation expenses (in hundredths) | 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 (in hundredths) | 11.00% | 11.00%
Range and weighted average of liquidation expenses (in hundredths) | 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 (in hundredths) | 33.70% | 33.70%
Range and weighted average of liquidation expenses (in hundredths) | 6.00% | 6.00%
Other Real Estate Owned [Member] | Weighted Average [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Range and weighted average of appraisal adjustments (in hundredths) | 17.30% | 17.30%
Range and weighted average of liquidation expenses (in hundredths) | 5.00% | 5.00%
Significant Unobservable Inputs (Level 3) [Member] | Impaired Loans [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Assets, Fair Value Estimate | $ 2,354 | $ 2,637
Valuation Technique | Appraisal of collateral | Appraisal of collateral
Unobservable Input | Appraisal adjustments | Appraisal adjustments
Significant Unobservable Inputs (Level 3) [Member] | Other Real Estate Owned [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Assets, Fair Value Estimate | $ 437 | $ 237
Valuation Technique | Appraisal of collateral | Appraisal of collateral
Unobservable Input | Appraisal adjustments | 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=25499696&loc=d3e19207-110258 + Details
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