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Stock-Based Compensation Arrangements (Details 3) - Restricted Stock Units - $ / shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Nonvested activity      
Non-vested at the beginning of the period (in shares) 89,016 119,248  
Granted (in shares)   85,097
Vested (in shares) (89,016) (29,999)  
Forfeited (in shares)   (233)  
Non-vested at the end of the period (in shares) 89,016 119,248
Weighted Average Grant Date Value Per Share      
Non-vested at the beginning of the period (in dollars per share) $ 5.56 $ 5.62  
Granted (in dollars per share)    
Forfeited (in dollars per share)   $ 5.81  
Vested (in dollars per share) $ 5.56 5.39  
Non-vested at the end of the period (in dollars per share) $ 5.56 $ 5.62