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Loans and Leases (Changes In Carrying Value Of Acquired Impaired Loans) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Jan. 13, 2017
Mar. 11, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Impaired Financing Receivable, Unpaid Principal Balance $ 724,745 $ 999,926 $ 724,745 $ 999,926      
Carrying Value of Acquired Impaired Loans [Roll Forward]              
Beginning balance     606,576 762,998      
Fair value of acquired loans           $ 29,430 $ 15,555
Accretion 16,200 13,500 45,891 45,699      
Payments received and other changes, net     (168,308) (186,234)      
Ending balance 513,589 $ 638,018 513,589 $ 638,018      
Loans on the Cost Recovery Method              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loans on cost recovery method 3,100   3,100   $ 3,300    
Commercial              
Carrying Value of Acquired Impaired Loans [Roll Forward]              
Beginning balance     296,672        
Ending balance 252,828   252,828        
Noncommercial              
Carrying Value of Acquired Impaired Loans [Roll Forward]              
Ending balance 260,761   260,761        
Mortgage | Noncommercial              
Carrying Value of Acquired Impaired Loans [Roll Forward]              
Beginning balance     309,904        
PCI Loans              
Carrying Value of Acquired Impaired Loans [Roll Forward]              
Nonaccruing $ 800   $ 800   $ 1,300