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Company's Gross Gains and Gross Losses Realized from Sale of 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
Schedule of Available-for-sale Securities [Line Items]        
Gross realized gains $ 152 $ 30 $ 307 $ 119
Gross realized losses (39) (39) (77) (77)
Net gain (loss) on sale of securities $ 113 $ (9) $ 230 $ 42