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Other Real Estate Owned (OREO) - Additional Information (Detail) - USD ($)
 6 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Other Real Estate [Line Items]        
Residential real estate carrying amount included in OREO $ 250,000   $ 250,000 $ 2,903,000
Net expenses applicable to other real estate owned 6,000 $ 43,000 46,000  
Residential real estate properties        
Other Real Estate [Line Items]        
Residential real estate carrying amount included in OREO 0   $ 0  
Mortgage loans foreclosed $ 0