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Securities - Summary of Investments in an Unrealized Loss Position that were Temporarily Impaired (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Summary of investments in unrealized loss position that were temporarily impaired    
Less than 12 months - Fair Value $ 58,243 $ 23,899
12 months or more - Fair Value 8,295   
Total - Fair Value 66,538 23,899
Summary of investments in unrealized loss position that were temporarily impaired, Unrealized (Loss)    
Less than 12 months - Unrealized (Loss) (2,198) (319)
12 months or more - Unrealized (Loss) (351)   
Total Unrealized (Loss) (2,549) (319)
U.S. Agency and Mortgage-Backed Securities [Member]
    
Summary of investments in unrealized loss position that were temporarily impaired    
Less than 12 months - Fair Value 50,796 19,612
12 months or more - Fair Value 5,877   
Total - Fair Value 56,673 19,612
Summary of investments in unrealized loss position that were temporarily impaired, Unrealized (Loss)    
Less than 12 months - Unrealized (Loss) (1,753) (236)
12 months or more - Unrealized (Loss) (196)   
Total Unrealized (Loss) (1,949) (236)
Obligations of States and Political Subdivisions [Member]
    
Summary of investments in unrealized loss position that were temporarily impaired    
Less than 12 months - Fair Value 7,447 4,287
12 months or more - Fair Value 2,418   
Total - Fair Value 9,865 4,287
Summary of investments in unrealized loss position that were temporarily impaired, Unrealized (Loss)    
Less than 12 months - Unrealized (Loss) (445) (83)
12 months or more - Unrealized (Loss) (155)   
Total Unrealized (Loss) $ (600) $ (83)