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Net Loss or Gain from Sale of Securities (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Schedule of Available-for-sale Securities [Line Items]    
Gross realized gains $ 132 $ 15
Gross realized losses (131) (38)
Net gain (loss) on sale of securities $ 1 $ (23)