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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 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Schedule of Available-for-sale Securities [Line Items]        
Gross realized gains   $ 315 $ 307 $ 434
Gross realized losses (39) (87) (116) (164)
Net gain (loss) on sale of securities $ (39) $ 228 $ 191 $ 270