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Stock Compensation Plans - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
May 13, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense related to stock awards $ 62 $ 72  
Stock-based compensation $ 189 $ 141  
2014 Stock Incentive Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares available for grant (in shares)     240,000
Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock units, granted (in shares) 8,989    
Restricted stock units, vested (in shares) 7,339    
Restricted stock units, nonvested (in shares) 7,103 5,662  
Vesting period 2 years    
Total unrecognized pre-tax compensation expense related to unvested restricted stock unit awards $ 64    
Stock-based compensation $ 127 $ 69  
Restricted Stock Units | Vested Immediately      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock units, vested (in shares) 2,999    
Restricted Stock Units | Vesting Within One Year      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock units, nonvested (in shares) 5,990    
Percentage of units vesting 50.00%    
Restricted Stock Units | Vesting Within Two Years      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of units vesting 50.00%    
Board of Directors      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock units, granted (in shares) 2,850