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Fair Value Measurements - Additional Information (Detail) (USD $)
3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2014
Impaired Loans
Mar. 31, 2013
Impaired Loans
Mar. 31, 2014
Impaired Loans
Level 3
Minimum
Dec. 31, 2013
Impaired Loans
Level 3
Minimum
Mar. 31, 2014
Impaired Loans
Level 3
Maximum
Dec. 31, 2013
Impaired Loans
Level 3
Maximum
Mar. 31, 2014
Foreclosed Real Estate
Mar. 31, 2013
Foreclosed Real Estate
Mar. 31, 2014
Foreclosed Real Estate
Level 3
Minimum
Dec. 31, 2013
Foreclosed Real Estate
Level 3
Minimum
Mar. 31, 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%     19.00%   38.00%  
Provisions for loan losses $ 25,000 $ 250,000 $ 13,000 $ 45,000                    
Fair value measurement, discount rate                       10.00%   38.00%
Foreclosed real estate write down charges                 $ 0 $ 32,000