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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, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Earnings Per Share [Abstract]        
Net income $ 17,104 $ 14,339 $ 32,254 $ 28,510
Non-Convertible Preferred Stock Dividend (Series A,B and D) (1,629) (1,629) (3,256) (3,256)
Convertible Preferred Stock Dividend (Series C) (1,837) (1,837) (3,675) (3,675)
Income available to common shareholders 13,638 10,873 25,323 21,579
Effect of assumed conversion of convertible preferred stock 1,837 1,837 3,675 3,675
Income available to common sharesholders assuming conversion $ 15,475 $ 12,710 $ 28,998 $ 25,254
Average common shares outstanding 43,947 43,914 43,931 43,906
Average potential common shares options 15 43 24 37
Average potential common shares convertible preferred stock 7,138 7,138 7,138 7,138
Average common shares outstanding and equivalents 51,100 51,095 51,093 51,081
Earnings per common share - basic $ 0.3 $ 0.25 $ 0.58 $ 0.49
Earnings per common share - diluted $ 0.3 $ 0.25 $ 0.57 $ 0.49