XML 73 R63.htm IDEA: XBRL DOCUMENT v3.7.0.1
Stock-Based Compensation Plans - Additional Information (Detail)
3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
ExecutiveOfficers
shares
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
ExecutiveOfficers
shares
Jun. 30, 2016
USD ($)
Dec. 31, 2016
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares available for grant | shares 311,209   311,209    
Stock-based compensation expense     $ 67,000 $ 16,000  
Unrecognized compensation expenses related to stock award $ 0   0    
Unearned Employee Stock Ownership Plan Shares          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation expense $ 8,000 $ 0 24,000 16,000  
Restricted Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation expense     $ 43,000 $ 0  
Number of executives | ExecutiveOfficers 3   3    
Share based compensation, unvested restricted stock granted | shares 9,000   9,000   0
Restricted Stock | Executive          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share based compensation, restricted stock granted | shares     14,000