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Net Loss or Gain from Sale of Securities (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Schedule of Available-for-sale Securities [Line Items]        
Gross realized gains $ 203 $ 26 $ 344 $ 292
Gross realized losses (178) (65) (397) (141)
Net gain (loss) on sale of securities $ 25 $ (39) $ (53) $ 151