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Goodwill And Other Intangible Assets (Schedule of Goodwill) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Goodwill [Roll Forward]      
Balance as of December 31, 2018 $ 497,267 $ 57,315  
Goodwill impairment   439,952  
Balance as of December 31, 2019 452,390 497,267 $ 57,315
Goodwill, Impairment Loss 44,877 0 0
Other intangible assets, gross carrying amount 69,900 69,900  
Finite-Lived Intangible Assets, Accumulated Amortization (24,788) (14,229)  
Finite-Lived Intangible Assets, Net 45,112 55,671  
CDI      
Goodwill [Roll Forward]      
Other intangible assets, gross carrying amount 57,400 57,400  
Finite-Lived Intangible Assets, Accumulated Amortization (19,829) (10,436)  
Finite-Lived Intangible Assets, Net 37,571 46,964  
Community Banking Reporting Unit      
Goodwill [Roll Forward]      
Balance as of December 31, 2018 256,323 17,825  
Goodwill impairment   238,498  
Balance as of December 31, 2019 256,323 256,323 17,825
Goodwill, Impairment Loss 0    
Wholesale Banking Reporting Unit      
Goodwill [Roll Forward]      
Balance as of December 31, 2018 171,636 11,936  
Goodwill impairment   159,700  
Balance as of December 31, 2019 171,636 171,636 11,936
Goodwill, Impairment Loss 0    
Consumer Mortgages Reporting Unit      
Goodwill [Roll Forward]      
Balance as of December 31, 2018 44,877 3,123  
Goodwill impairment   41,754  
Balance as of December 31, 2019 0 44,877 3,123
Goodwill, Impairment Loss 44,877    
Wealth Management Reporting Unit      
Goodwill [Roll Forward]      
Balance as of December 31, 2018 24,431 24,431  
Goodwill impairment   0  
Balance as of December 31, 2019 24,431 $ 24,431 $ 24,431
Goodwill, Impairment Loss $ 0