XML 82 R68.htm IDEA: XBRL DOCUMENT v3.3.1.900
Net Loss or Gain from Sale of Securities (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]                      
Gross realized gains                 $ 363 $ 2,257 $ 553
Gross realized losses                 (219) (3,642) (154)
Net gain (loss) on sale of securities $ (7) $ (39) $ 213 $ (23) $ (1,691) $ 320 $ (59) $ 45 $ 144 $ (1,385) $ 399