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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, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Earnings Per Common Share [Abstract]        
Net income $ 23,979 $ 19,649 $ 47,449 $ 36,566
Non-Convertible Preferred Stock Dividend (Series A,B and D) (1,628) (1,628) (3,256) (3,255)
Convertible Preferred Stock Dividend (Series C) 0 (1,837) 0 (3,675)
Income available to common shareholders 22,351 16,184 44,193 29,636
Effect of assumed conversion of convertible preferred stock 0 1,837 0 3,675
Income available to common sharesholders assuming conversion $ 22,351 $ 18,021 $ 44,193 $ 33,311
Average common shares outstanding 51,330 43,975 51,317 43,965
Average potential common shares options 350 113 335 54
Average potential common shares convertible preferred stock 0 7,138 0 7,138
Average common shares outstanding and equivalents 51,680 51,226 51,652 51,157
Earnings per common share - basic $ 0.44 $ 0.36 $ 0.86 $ 0.67
Earnings per common share - diluted $ 0.43 $ 0.35 $ 0.86 $ 0.65