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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, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Earnings Per Common Share [Abstract]        
Net income $ 40,827 $ 21,787 $ 71,200 $ 23,588
Non-convertible preferred stock (Series A,B and D) 0 (1,628) (1,255) (3,256)
Income available to common shareholders $ 40,827 $ 20,159 $ 69,945 $ 20,332
Average common shares outstanding 51,636 51,336 51,517 51,370
Average potential common shares-options 412 134 368 214
Total weighted average common shares outstanding and equivalents 52,048 51,470 51,885 51,584
Earnings per common share - basic $ 0.79 $ 0.39 $ 1.36 $ 0.40
Earnings per common share - diluted $ 0.78 $ 0.39 $ 1.35 $ 0.39