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Net Loss or Gain from Sale of Securities (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Schedule of Available-for-sale Securities [Line Items]        
Gross realized gains $ 9 $ 251 $ 141 $ 266
Gross realized losses (88) (38) (219) (76)
Net (loss) gain on sale of securities $ (79) $ 213 $ (78) $ 190