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Benefit Plans, Stock Based Compensation Plans - Equity Awards (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]      
Stock based compensation expense $ 173 $ 150 $ 224
Stock Options [Member]      
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]      
Options maximum term 5 years    
Summary of Changes in Stock Option Awards [Roll Forward]      
Beginning balance (in shares) 742,941    
New options awarded (in shares) 0    
Expired options (in shares) 0    
Options forfeited (in shares) (11,750)    
Exercised options (in shares) (176,550) (784,000) (241,000)
Ending balance (in shares) 554,641 742,941  
Stock Option Awards, Exercisable [Roll Forward]      
Ending balance (in shares) 458,891    
Weighted Average Exercise Price [Roll Forward]      
Beginning balance (in dollars per share) $ 6.78    
New options awarded (in dollars per share) 0    
Expired options (in dollars per share) 0    
Options forfeited (in dollars per share) 0    
Exercised options (in dollars per share) 7.13    
Ending balance (in dollars per share) $ 6.65 $ 6.78  
Additional Disclosures [Abstract]      
Weighted average remaining contractual life, options outstanding 5 years 6 months    
Exercisable options, weighted average exercise price (in dollars per share) $ 6.64    
Weighted average remaining contractual life, exercisable outstanding 5 years 3 months 18 days    
Intrinsic value of outstanding stock options $ 144    
Intrinsic value of vested stock options $ 140    
Stock Options [Member] | Maximum [Member]      
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]      
Options maximum term 10 years    
Restricted Common Shares [Member]      
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]      
Stock based compensation expense $ 173 $ 150 $ 224
2010 Employee Stock Option Plan [Member]      
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]      
Shares available for grant (in shares) 2,300,000    
2010 Employee Stock Option Plan [Member] | Other Equity Based Cash Settled Awards [Member]      
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]      
Shares available for grant (in shares) 1,400,000    
2010 Directors Stock Option Plan [Member]      
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]      
Shares available for grant (in shares) 250,000    
2010 Directors Stock Option Plan [Member] | Other Equity Based Cash Settled Awards [Member]      
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]      
Shares available for grant (in shares) 250,000