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Investment Securities - Amortized Cost, Gross Unrealized Gains, Gross Unrealized Losses and Approximate Fair Values of Available-for-Sale Securities (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 37,609 $ 38,888
Gross Unrealized Gains      
Gross Unrealized Losses (794) (1,187)
Fair Value 36,815 37,701
U. S. Government Agency Bonds [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 7,500 7,500
Gross Unrealized Gains      
Gross Unrealized Losses (255) (421)
Fair Value 7,245 7,079
U. S. Government Agency Mortgage-Backed Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 21,109 22,388
Gross Unrealized Gains      
Gross Unrealized Losses (477) (636)
Fair Value 20,632 21,752
Corporate Bonds [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 9,000 9,000
Gross Unrealized Gains      
Gross Unrealized Losses (62) (130)
Fair Value $ 8,938 $ 8,870