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Fair value estimates - Additional Quantitative Information about Assets Measured at Fair Value on Nonrecurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Impaired Loans [Member] | Minimum [Member]
   
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Range and weighted average of appraisal adjustments 14.00% 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 33.70% 33.70%
Range and weighted average of liquidation expenses 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 18.50% 17.30%
Range and weighted average of liquidation expenses 4.70% 5.00%
Other Real Estate Owned [Member] | Minimum [Member]
   
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Range and weighted average of appraisal adjustments   11.00%
Range and weighted average of liquidation expenses   3.00%
Other Real Estate Owned [Member] | Maximum [Member]
   
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Range and weighted average of appraisal adjustments   33.70%
Range and weighted average of liquidation expenses   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   17.30%
Range and weighted average of liquidation expenses   5.00%
Significant Unobservable Inputs (Level 3) [Member]
   
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Assets, Fair Value Estimate      
Significant Unobservable Inputs (Level 3) [Member] | Impaired Loans [Member]
   
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Assets, Fair Value Estimate 1,561 2,354
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
Valuation Technique   Appraisal of collateral
Unobservable Input   Appraisal adjustments