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Securities - Summary of Investments in an Unrealized Loss Position that were Temporarily Impaired (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Summary of investments in unrealized loss position that were temporarily impaired    
Less than 12 months - Fair Value $ 56,975 $ 23,899
12 months or more - Fair Value 12,843   
Total - Fair Value 69,818 23,899
Summary of investments in unrealized loss position that were temporarily impaired, Unrealized (Loss)    
Less than 12 months - Unrealized (Loss) (2,177) (319)
12 months or more - Unrealized (Loss) (559)   
Total Unrealized (Loss) (2,736) (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 49,810 19,612
12 months or more - Fair Value 10,180   
Total - Fair Value 59,990 19,612
Summary of investments in unrealized loss position that were temporarily impaired, Unrealized (Loss)    
Less than 12 months - Unrealized (Loss) (1,755) (236)
12 months or more - Unrealized (Loss) (383)   
Total Unrealized (Loss) (2,138) (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 7,165 4,287
12 months or more - Fair Value 2,663   
Total - Fair Value 9,828 4,287
Summary of investments in unrealized loss position that were temporarily impaired, Unrealized (Loss)    
Less than 12 months - Unrealized (Loss) (422) (83)
12 months or more - Unrealized (Loss) (176)   
Total Unrealized (Loss) $ (598) $ (83)