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Fair Value of Instruments - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Interest-bearing deposits maturing date 90 days    
Carrying amounts of dividends payable, number of days Forty days    
Impaired loans categorized as Level 3 $ 2,059 $ 2,440 $ 4,144
Specific allocation for impaired loans 261 516 860
Level 3 [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Impaired loans categorized as Level 3 1,800 1,900  
Fair Value on a Recurring Basis [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Specific allocation for impaired loans $ 261 $ 516