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Fair Value - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Impaired loans, recorded investment $ 19,151   $ 19,151   $ 18,308
Impaired loans allowance 2,646   2,646   1,882
Collateral Dependent Loans [Member]
          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Impaired loans, recorded investment 8,547   8,547   8,161
Impaired loans allowance 2,120   2,120   1,455
Impaired loans, additional provisions $ 280 $ 2,328 $ 630 $ 2,529