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Earnings Per Share (Tables)
3 Months Ended
Mar. 31, 2015
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
     Three Months Ended
     March 31,
(Amounts in thousands, except share and per share amounts) 2015 2014
 Net income $ 17,822 $ 15,244
          
 Weighted average shares outstanding – basic and diluted    5,111,201   5,109,717
          
 Net income per common share – basic and diluted $ 3.49 $ 2.98