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Investment Securities - Investments' Gross Unrealized Losses and Fair Value (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Available For Sale And Held To Maturity Securities In Continuous Unrealized Loss Position [Line Items]    
Available-for-Sale, Less than 12 Months, Fair Value $ 71,004 $ 69,120
Available-for-Sale, Less than 12 Months, Unrealized Losses (399) (1,558)
Available-for-Sale, 12 Months or More, Fair Value 18,467 271
Available-for-Sale, 12 Months or More, Unrealized Losses (559) (18)
Held-to-Maturity, Less than 12 Months, Fair Value 10,983  
Held-to-Maturity, Less than 12 Months, Unrealized Losses (24)  
Held-to-Maturity, 12 Months or More, Fair Value 21,369  
Held-to-Maturity, 12 Months or More, Unrealized Losses (426)  
Residential [Member]
    
Available For Sale And Held To Maturity Securities In Continuous Unrealized Loss Position [Line Items]    
Available-for-Sale, Less than 12 Months, Fair Value 48,499 43,091
Available-for-Sale, Less than 12 Months, Unrealized Losses (280) (885)
Available-for-Sale, 12 Months or More, Fair Value 13,257  
Available-for-Sale, 12 Months or More, Unrealized Losses (314)  
Commercial [Member]
    
Available For Sale And Held To Maturity Securities In Continuous Unrealized Loss Position [Line Items]    
Available-for-Sale, Less than 12 Months, Fair Value 22,236 21,231
Available-for-Sale, Less than 12 Months, Unrealized Losses (116) (337)
Available-for-Sale, 12 Months or More, Fair Value 1,344 271
Available-for-Sale, 12 Months or More, Unrealized Losses (36) (18)
Held-to-Maturity, Less than 12 Months, Fair Value 552  
Held-to-Maturity, Less than 12 Months, Unrealized Losses (5)  
Obligations of States and Political Subdivisions [Member]
    
Available For Sale And Held To Maturity Securities In Continuous Unrealized Loss Position [Line Items]    
Available-for-Sale, Less than 12 Months, Fair Value 269 1,050
Available-for-Sale, Less than 12 Months, Unrealized Losses (3) (2)
Held-to-Maturity, Less than 12 Months, Fair Value 583  
Held-to-Maturity, Less than 12 Months, Unrealized Losses (2)  
U.S. Treasury Securities [Member]
    
Available For Sale And Held To Maturity Securities In Continuous Unrealized Loss Position [Line Items]    
Available-for-Sale, Less than 12 Months, Fair Value   3,748
Available-for-Sale, Less than 12 Months, Unrealized Losses   (334)
Available-for-Sale, 12 Months or More, Fair Value 3,866  
Available-for-Sale, 12 Months or More, Unrealized Losses (209)  
Obligations of U.S. Government Sponsored Agencies [Member]
    
Available For Sale And Held To Maturity Securities In Continuous Unrealized Loss Position [Line Items]    
Held-to-Maturity, Less than 12 Months, Fair Value 9,848 33,365
Held-to-Maturity, Less than 12 Months, Unrealized Losses (17) (1,685)
Held-to-Maturity, 12 Months or More, Fair Value 21,369  
Held-to-Maturity, 12 Months or More, Unrealized Losses $ (426)