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Common Stock (Detail) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Jun. 25, 2014
2014 Restricted Stock Plan [Member]                
Class of Stock [Line Items]                
Shares authorized per plan               100,000
Shares granted, net         16,045      
Shares granted     16,045   7,540 5,475 3,500  
Shares cancelled         470      
Unrecognized compensation cost related to all non-vested share-based compensation awards         $ 215,000      
Granted shares unvested 13,055   13,055   13,055 8,100    
Restricted shares vested during period     2,990   2,115      
Allocated share-based compensation expense $ 19,000 $ 8,000 $ 37,000 $ 17,000 $ 53,000 $ 28,000    
Dividend Reinvestment Plan [Member]                
Class of Stock [Line Items]                
Shares authorized per plan         330,750