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Stock-Based Compensation (Detail Textuals)
$ / shares in Units, $ in Thousands
3 Months Ended
Jan. 05, 2018
Executiveofficer
$ / shares
shares
Mar. 31, 2018
USD ($)
$ / shares
shares
Mar. 31, 2017
$ / shares
shares
Defined Benefit Plan Disclosure [Line Items]      
Restricted stock grants to senior management and directors   6,400  
Share based payment award, vesting period   5 years  
Stock options grants to senior management and directors   15,000 0
Stock option exercise price | $ / shares   $ 17.52 $ 0
Compensation expense | $   $ 76,000  
Restricted stock      
Defined Benefit Plan Disclosure [Line Items]      
Restricted stock grants to senior management and directors 6,400    
Share based payment award, vesting period 5 years    
Percentage of share base payment award 20.00%    
Number of executive officer | Executiveofficer 4    
Stock option      
Defined Benefit Plan Disclosure [Line Items]      
Share based payment award, vesting period 5 years    
Issuance of stock options   194,168  
Stock options grants to senior management and directors 15,000    
Stock option exercise price | $ / shares $ 17.52    
Term of option 10 years    
Number of executive officer | Executiveofficer 3    
Senior management and directors | Stock option      
Defined Benefit Plan Disclosure [Line Items]      
Share based payment award, vesting period   5 years