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Securities - Summary of Investments in an Unrealized Loss Position that were Temporarily Impaired (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Summary of investments in unrealized loss position that were temporarily impaired    
Less than 12 months - Fair Value $ 19,497 $ 56,975
12 months or more - Fair Value 43,371 12,843
Total - Fair Value 62,868 69,818
Summary of investments in unrealized loss position that were temporarily impaired, Unrealized (Loss)    
Less than 12 months - Unrealized (Loss) (276) (2,177)
12 months or more - Unrealized (Loss) (1,412) (559)
Total Unrealized (Loss) (1,688) (2,736)
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 16,702 49,810
12 months or more - Fair Value 36,372 10,180
Total - Fair Value 53,074 59,990
Summary of investments in unrealized loss position that were temporarily impaired, Unrealized (Loss)    
Less than 12 months - Unrealized (Loss) (255) (1,755)
12 months or more - Unrealized (Loss) (1,155) (383)
Total Unrealized (Loss) (1,410) (2,138)
Obligations of States and Political Subdivisions [Member]
    
Summary of investments in unrealized loss position that were temporarily impaired    
Less than 12 months - Fair Value 2,795 7,165
12 months or more - Fair Value 6,999 2,663
Total - Fair Value 9,794 9,828
Summary of investments in unrealized loss position that were temporarily impaired, Unrealized (Loss)    
Less than 12 months - Unrealized (Loss) (21) (422)
12 months or more - Unrealized (Loss) (257) (176)
Total Unrealized (Loss) $ (278) $ (598)