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Other Real Estate Owned (OREO) - Additional Information (Detail) - USD ($)
 9 Months Ended 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Other Real Estate [Line Items]        
Residential real estate carrying amount included in OREO $ 250,000   $ 2,903,000 $ 2,263,000
Net expenses applicable to other real estate owned 46,000 $ 101,000 196,000  
Residential Real Estate Properties [Member]        
Other Real Estate [Line Items]        
Residential real estate carrying amount included in OREO 0   $ 627,000  
Mortgage loans foreclosed $ 100,000