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Earnings Per Common Share (Schedule of Earnings Per Share Basic and Diluted) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Earnings Per Common Share [Abstract]        
Net income $ 21,787 $ 23,979 $ 23,588 $ 47,449
Non-convertible preferred stock (Series A,B and D) (1,628) (1,628) (3,256) (3,256)
Income available to common shareholders $ 20,159 $ 22,351 $ 20,332 $ 44,193
Average common shares outstanding 51,336 51,330 51,370 51,317
Average potential common shares-options 134 350 214 335
Average common shares outstanding and equivalents 51,470 51,680 51,584 51,652
Earnings per common share - basic $ 0.39 $ 0.44 $ 0.40 $ 0.86
Earnings per common share - diluted $ 0.39 $ 0.43 $ 0.39 $ 0.86