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Securities - Securities with Unrealized Losses (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]    
Less than Twelve Months, Fair Value $ 7,974 $ 2,882
Less than Twelve Months, Unrealized Loss 97 16
Twelve Months or More than Twelve Months, Fair Value      
Twelve Months or More than Twelve Months, Unrealized Loss      
Total, Fair Value 7,974 2,882
Total, Unrealized Loss 97 16
Corporate debt [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Less than Twelve Months, Fair Value 4,365  
Less than Twelve Months, Unrealized Loss 64  
Twelve Months or More than Twelve Months, Fair Value     
Twelve Months or More than Twelve Months, Unrealized Loss     
Total, Fair Value 4,365  
Total, Unrealized Loss 64  
State and municipal [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Less than Twelve Months, Fair Value 1,936  
Less than Twelve Months, Unrealized Loss 20  
Twelve Months or More than Twelve Months, Fair Value     
Twelve Months or More than Twelve Months, Unrealized Loss     
Total, Fair Value 1,936  
Total, Unrealized Loss 20  
Collateralized mortgage obligations [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Less than Twelve Months, Fair Value 1,673 2,882
Less than Twelve Months, Unrealized Loss 13 16
Twelve Months or More than Twelve Months, Fair Value      
Twelve Months or More than Twelve Months, Unrealized Loss      
Total, Fair Value 1,673 2,882
Total, Unrealized Loss $ 13 $ 16