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Fair Value of Instruments - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended 12 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Sep. 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 $ 1,686 $ 2,440 $ 1,561
Specific allocation for impaired loans 252 516 423
Asset impairment charges 0 0  
Level 3 [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Impaired loans categorized as Level 3 1,400 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 $ 256 $ 516