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Earnings Per Common Share (Earnings per common share) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Earnings Per Share [Abstract]        
Net income $ 19,649 $ 17,104 $ 36,566 $ 32,254
Non-Convertible Preferred Stock Dividend (Series A,B and D) (1,628) (1,629) (3,255) (3,256)
Convertible Preferred Stock Dividend (Series C) (1,837) (1,837) (3,675) (3,675)
Income available to common shareholders 16,184 13,638 29,636 25,323
Effect of assumed conversion of convertible preferred stock 1,837 1,837 3,675 3,675
Income available to common sharesholders assuming conversion $ 18,021 $ 15,475 $ 33,311 $ 28,998
Average common shares outstanding 43,975 43,947 43,965 43,931
Average potential common shares options 113 15 54 24
Average potential common shares convertible preferred stock 7,138 7,138 7,138 7,138
Average common shares outstanding and equivalents 51,226 51,100 51,157 51,093
Earnings per common share - basic $ 0.36 $ 0.3 $ 0.67 $ 0.58
Earnings per common share - diluted $ 0.35 $ 0.3 $ 0.65 $ 0.57