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Fair Value - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Impaired loans, recorded investment $ 15,866   $ 16,778
Impaired loans allowance 3,034   $ 3,190
Collateral Dependent Loans [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Impaired loans, recorded investment 3,406 $ 3,489  
Impaired loans allowance 1,159 1,242  
Impaired loans, additional (negative) provisions $ (82) $ 3