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Investment Securities - Gross Unrealized Loss and Fair Value of Available-for-Sale Securities, Aggregated by the Length of Time (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Less Than 12 Months, Fair Value $ 15,647 $ 15,950
Less Than 12 Months, Unrealized Loss (488) (712)
12 Months or More, Fair Value 21,142 21,726
12 Months or More, Unrealized Loss (306) (475)
Total, Fair Value 36,789 37,676
Total, Unrealized Loss (794) (1,187)
U. S. Government Agency Bonds [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Less Than 12 Months, Fair Value 7,245 7,079
Less Than 12 Months, Unrealized Loss (255) (421)
12 Months or More, Fair Value      
12 Months or More, Unrealized Loss      
Total, Fair Value 7,245 7,079
Total, Unrealized Loss (255) (421)
U. S. Government Agency Mortgage-Backed Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Less Than 12 Months, Fair Value 8,402 8,871
Less Than 12 Months, Unrealized Loss (233) (291)
12 Months or More, Fair Value 12,204 12,856
12 Months or More, Unrealized Loss (244) (345)
Total, Fair Value 20,606 21,727
Total, Unrealized Loss (477) (636)
Corporate Bonds [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
12 Months or More, Fair Value 8,938 8,870
12 Months or More, Unrealized Loss (62) (130)
Total, Fair Value 8,938 8,870
Total, Unrealized Loss $ (62) $ (130)