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Investment Securities - Investment Securities Available-for-Sale and Held-to-Maturity (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Available-for-Sale, Amortized Cost $ 166,471 $ 134,908
Available-for-Sale, Gross Unrealized Gains 3,268 2,422
Available-for-Sale, Gross Unrealized Losses (629) (1,576)
Available-for-Sale, Estimated Fair Value 169,110 135,754
Held-to-Maturity, Amortized Cost 40,835 35,050
Held-to-Maturity, Gross Unrealized Gains 24  
Held-to-Maturity, Gross Unrealized Losses (639)  
Held-to-Maturity, Estimated Fair Value 40,220  
Residential [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-Sale, Amortized Cost 110,284 82,840
Available-for-Sale, Gross Unrealized Gains 1,901 1,479
Available-for-Sale, Gross Unrealized Losses (289) (885)
Available-for-Sale, Estimated Fair Value 111,896 83,434
Commercial [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-Sale, Amortized Cost 36,084 30,677
Available-for-Sale, Gross Unrealized Gains 259 143
Available-for-Sale, Gross Unrealized Losses (110) (355)
Available-for-Sale, Estimated Fair Value 36,233 30,465
Held-to-Maturity, Amortized Cost 2,880  
Held-to-Maturity, Gross Unrealized Gains 24  
Held-to-Maturity, Gross Unrealized Losses 0  
Held-to-Maturity, Estimated Fair Value 2,904  
Obligations of States and Political Subdivisions [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-Sale, Amortized Cost 15,533 16,230
Available-for-Sale, Gross Unrealized Gains 1,108 799
Available-for-Sale, Gross Unrealized Losses 0 (2)
Available-for-Sale, Estimated Fair Value 16,641 17,027
Held-to-Maturity, Amortized Cost 589  
Held-to-Maturity, Gross Unrealized Gains 0  
Held-to-Maturity, Gross Unrealized Losses 0  
Held-to-Maturity, Estimated Fair Value 589  
U.S. Treasury Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-Sale, Amortized Cost 4,157 4,161
Available-for-Sale, Gross Unrealized Gains 0  
Available-for-Sale, Gross Unrealized Losses (228) (334)
Available-for-Sale, Estimated Fair Value 3,929 3,827
Obligations of U.S. Government Sponsored Agencies [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-Sale, Amortized Cost 413 1,000
Available-for-Sale, Gross Unrealized Gains 0 1
Available-for-Sale, Gross Unrealized Losses (2)  
Available-for-Sale, Estimated Fair Value 411 1,001
Held-to-Maturity, Amortized Cost   35,050
Held-to-Maturity, Gross Unrealized Losses   (1,685)
Held-to-Maturity, Estimated Fair Value   33,365
US Agencies [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Held-to-Maturity, Amortized Cost 37,366  
Held-to-Maturity, Gross Unrealized Gains 0  
Held-to-Maturity, Gross Unrealized Losses (639)  
Held-to-Maturity, Estimated Fair Value $ 36,727