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Other Real Estate Owned ("OREO") (Textual) (Detail) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Dec. 31, 2014
Real Estate Acquired Through Foreclosure $ 1.2 $ 1.4 $ 2.6
Mortgage Loans in Process of Foreclosure, Amount   $ 1.1