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Fair Value of Instruments - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended 12 Months Ended
Jun. 30, 2014
Segment
Dec. 31, 2013
Jun. 30, 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 $ 1,789 $ 2,440 $ 4,521
Specific allocation for impaired loans 202 516 771
Asset impairment charges 0 0  
Number of segments reported 1    
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 $ 202 $ 516