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Investment Securities (Schedule Of Fair Value And Unrealized Losses Of Securities) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Investment Holdings [Line Items]    
Available-for-sale securities, less than 12 months, fair value $ 979,191 $ 1,244,265
Available-for-sale securities, less than 12 months, unrealized losses 26,863 11,013
Available-for-sale securities, 12 months or longer, fair value 1,634,304 1,251,162
Available-for-sale securities, 12 months or longer, unrealized losses 85,050 30,803
Available-for-sale securities, fair value 2,613,495 2,495,427
Available-for-sale securities, unrealized losses 111,913 41,816
U.S. Treasury and agencies    
Investment Holdings [Line Items]    
Available-for-sale securities, less than 12 months, fair value 0 39,699
Available-for-sale securities, less than 12 months, unrealized losses 0 323
Available-for-sale securities, 12 months or longer, fair value 39,469 0
Available-for-sale securities, 12 months or longer, unrealized losses 538 0
Available-for-sale securities, fair value 39,469 39,699
Available-for-sale securities, unrealized losses 538 323
Obligations of states and political subdivisions    
Investment Holdings [Line Items]    
Available-for-sale securities, less than 12 months, fair value 115,065 20,566
Available-for-sale securities, less than 12 months, unrealized losses 2,819 322
Available-for-sale securities, 12 months or longer, fair value 27,164 24,798
Available-for-sale securities, 12 months or longer, unrealized losses 2,131 780
Available-for-sale securities, fair value 142,229 45,364
Available-for-sale securities, unrealized losses 4,950 1,102
Residential mortgage-backed securities and collateralized mortgage obligations    
Investment Holdings [Line Items]    
Available-for-sale securities, less than 12 months, fair value 864,126 1,184,000
Available-for-sale securities, less than 12 months, unrealized losses 24,044 10,368
Available-for-sale securities, 12 months or longer, fair value 1,567,671 1,226,364
Available-for-sale securities, 12 months or longer, unrealized losses 82,381 30,023
Available-for-sale securities, fair value 2,431,797 2,410,364
Available-for-sale securities, unrealized losses $ 106,425 $ 40,391