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Fair Value Measurements - Additional Information (Detail) (USD $)
3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Impaired Loans
Jun. 30, 2013
Impaired Loans
Jun. 30, 2014
Impaired Loans
Jun. 30, 2013
Impaired Loans
Jun. 30, 2014
Impaired Loans
Level 3
Minimum
Dec. 31, 2013
Impaired Loans
Level 3
Minimum
Jun. 30, 2014
Impaired Loans
Level 3
Maximum
Dec. 31, 2013
Impaired Loans
Level 3
Maximum
Jun. 30, 2014
Foreclosed Real Estate
Jun. 30, 2013
Foreclosed Real Estate
Jun. 30, 2014
Foreclosed Real Estate
Jun. 30, 2013
Foreclosed Real Estate
Jun. 30, 2014
Foreclosed Real Estate
Level 3
Minimum
Dec. 31, 2013
Foreclosed Real Estate
Level 3
Minimum
Jun. 30, 2014
Foreclosed Real Estate
Level 3
Maximum
Dec. 31, 2013
Foreclosed Real Estate
Level 3
Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                        
Fair value measurement, estimated costs to sell the collateral                 10.00% 10.00% 48.00% 48.00%         0.00%   23.00%  
Provisions for loan losses $ 90,000 $ 225,000 $ 115,000 $ 475,000 $ 8,000 $ 0 $ 21,000 $ 45,000                        
Fair value measurement, discount rate                                   10.00%   38.00%
Foreclosed real estate write down charges                         $ 0 $ 0 $ 0 $ 32,000