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Net Loss or Gain from Sale of Securities (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]                      
Gross realized gains                 $ 757 $ 363 $ 2,257
Gross realized losses                 (422) (219) (3,642)
Net gain (loss) on sale of securities $ 388 $ 25 $ (79) $ 1 $ (7) $ (39) $ 213 $ (23) $ 335 $ 144 $ (1,385)