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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
Mar. 31, 2018
Mar. 31, 2017
Earnings Per Share [Abstract]    
Net income $ 16,917 $ 15,150
Non-Convertible Preferred Stock Dividend (Series A,B and D) (1,627) (1,627)
Convertible Preferred Stock Dividend (Series C) (1,838) (1,838)
Income available to common shareholders 13,452 11,685
Effect of assumed conversion of convertible preferred stock 1,838 1,838
Income available to common sharesholders assuming conversion $ 15,290 $ 13,523
Average common shares outstanding 43,955 43,916
Average potential common shares options 28 77
Average potential common shares convertible preferred stock 7,138 7,138
Average common shares outstanding and equivalents 51,121 51,131
Earnings per common share - basic $ 0.31 $ 0.27
Earnings per common share - diluted $ 0.3 $ 0.26