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Goodwill and Intangible Assets (Schedule of Goodwill and Intangible Assets) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Goodwill and Intangible Assets [Roll Forward]                
Total goodwill, beginning of period     $ 765,842          
Total goodwill, end of period $ 765,842 $ 765,842 765,842 $ 765,842        
CDI current period amortization (2,649) (3,088) (5,397) (6,276)        
Indefinite-lived Intangible Assets (Excluding Goodwill) 919 919 919 919        
Other intangible assets, net 40,540 51,897 40,540 51,897   $ 45,937    
Total goodwill and intangible assets, end of period 806,382 817,739 $ 806,382 817,739        
Core Deposits [Member]                
Goodwill and Intangible Assets [Line Items]                
Estimated life of CDI, in years     10 years          
Goodwill and Intangible Assets [Roll Forward]                
Gross core deposit intangible balance, beginning of period         $ 105,473 105,473 $ 105,473 $ 105,473
Accumulated amortization at beginning of period         $ (63,203) $ (60,455) $ (51,407) $ (48,219)
Core deposit intangible, net, beginning of period 42,270 54,066 $ 45,018 57,254        
CDI current period amortization (2,649) (3,088) (5,397) (6,276)        
Total core deposit intangible, end of period $ 39,621 $ 50,978 $ 39,621 $ 50,978