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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 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Earnings Per Common Share [Abstract]        
Net income $ 41,671 $ 27,438 $ 112,871 $ 51,026
Income available to common shareholders $ 41,671 $ 25,810 $ 111,616 $ 46,142
Average common shares outstanding 51,063 51,342 51,364 51,361
Average potential common shares-options 453 185 384 202
Total weighted average common shares outstanding and equivalents 51,516 51,527 51,748 51,563
Earnings per common share - basic $ 0.82 $ 0.50 $ 2.18 $ 0.90
Earnings per common share - diluted $ 0.81 $ 0.50 $ 2.15 $ 0.89
Preferred Non Convertible Stock [Member]        
Class Of Stock [Line Items]        
Less: Dividends on preferred stock $ 0 $ (1,628) $ (1,255) $ (4,884)