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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, 2014
Dec. 31, 2013
Summary of investments in unrealized loss position that were temporarily impaired    
Less than 12 months - Fair Value $ 17,449 $ 56,975
12 months or more - Fair Value 39,700 12,843
Total - Fair Value 57,149 69,818
Summary of investments in unrealized loss position that were temporarily impaired, Unrealized (Loss)    
Less than 12 months - Unrealized (Loss) (210) (2,177)
12 months or more - Unrealized (Loss) (1,210) (559)
Total Unrealized (Loss) (1,420) (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 15,817 49,810
12 months or more - Fair Value 33,557 10,180
Total - Fair Value 49,374 59,990
Summary of investments in unrealized loss position that were temporarily impaired, Unrealized (Loss)    
Less than 12 months - Unrealized (Loss) (205) (1,755)
12 months or more - Unrealized (Loss) (1,043) (383)
Total Unrealized (Loss) (1,248) (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 1,632 7,165
12 months or more - Fair Value 6,143 2,663
Total - Fair Value 7,775 9,828
Summary of investments in unrealized loss position that were temporarily impaired, Unrealized (Loss)    
Less than 12 months - Unrealized (Loss) (5) (422)
12 months or more - Unrealized (Loss) (167) (176)
Total Unrealized (Loss) $ (172) $ (598)