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Securities - Summary of Proceeds and Gains and Losses from Sales of Available-for-Sale Securities (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Amortized Cost And Fair Value Debt Securities [Abstract]        
Proceeds $ 500   $ 500  
Realized gains 10   10  
Realized losses            
Impairment losses            
Net securities gains $ 10   $ 10