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Investment Securities Available for Sale - Sales of Available for Sale Securities (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Proceeds from sales $ 11,973 $ 9,115 $ 15,284 $ 15,686 $ 8,383 $ 25,088
Gross realized gains 233 306 373 440 306 186
Gross realized losses $ (22) $ (3) $ (116) $ (117) $ (58) $ (175)