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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
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