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Short-term borrowings - Summary of Short-term Borrowings (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Short-term Debt [Line Items]    
Short-term borrowings $ 22,052 $ 8,019
Short-term borrowings, Average Balance 10,156 11,459
Short-term borrowings, Maximum Month-End Balance 25,898 21,905
Short-term borrowings, Weighted Average Rate for the Year 0.33% 0.34%
Short-term borrowings, Weighted Average Rate at end of the Year 0.67% 0.34%
FHLB Advances [Member]
    
Short-term Debt [Line Items]    
Short-term borrowings     
Short-term borrowings, Average Balance 51 826
Short-term borrowings, Maximum Month-End Balance    8,625
Short-term borrowings, Weighted Average Rate for the Year 0.33% 0.36%
Repurchase Agreements [Member]
    
Short-term Debt [Line Items]    
Short-term borrowings 22,052 8,019
Short-term borrowings, Average Balance 10,105 10,633
Short-term borrowings, Maximum Month-End Balance $ 25,898 $ 13,280
Short-term borrowings, Weighted Average Rate for the Year 0.33% 0.33%
Short-term borrowings, Weighted Average Rate at end of the Year 0.67% 0.34%