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Net Loss or Gain from Sale of Securities (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Schedule of Available-for-sale Securities [Line Items]        
Gross realized gains $ 251 $ 1,288 $ 266 $ 1,511
Gross realized losses (38) (1,347) (76) (1,525)
Net gain (loss) on sale of securities $ 213 $ (59) $ 190 $ (14)