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Securities - Summary of Investments in an Unrealized Loss Position that were Temporarily Impaired (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Summary of investments in unrealized loss position that were temporarily impaired    
Less than 12 months - Fair Value $ 51,760 $ 56,975
12 months or more - Fair Value 17,320 12,843
Total - Fair Value 69,080 69,818
Summary of investments in unrealized loss position that were temporarily impaired, Unrealized (Loss)    
Less than 12 months - Unrealized (Loss) (1,449) (2,177)
12 months or more - Unrealized (Loss) (753) (559)
Total Unrealized (Loss) (2,202) (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 44,471 49,810
12 months or more - Fair Value 13,026 10,180
Total - Fair Value 57,497 59,990
Summary of investments in unrealized loss position that were temporarily impaired, Unrealized (Loss)    
Less than 12 months - Unrealized (Loss) (1,248) (1,755)
12 months or more - Unrealized (Loss) (488) (383)
Total Unrealized (Loss) (1,736) (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 7,289 7,165
12 months or more - Fair Value 4,294 2,663
Total - Fair Value 11,583 9,828
Summary of investments in unrealized loss position that were temporarily impaired, Unrealized (Loss)    
Less than 12 months - Unrealized (Loss) (201) (422)
12 months or more - Unrealized (Loss) (265) (176)
Total Unrealized (Loss) $ (466) $ (598)