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Available-For-Sale And Held-To-Maturity Securities (Contractual Maturities) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale Securities, debt maturities, within one year, Fair Value [1] $ 37,275  
Available-for-sale Securities, debt maturities, after one year through five, Fair Value [1] 719,556  
Available-for-sale Securities, debt maturities, after five through ten years, fair value [1] 696,128  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value [1] 1,896,648  
Available-for-sale Securities, debt maturities, Fair Value [1] 3,349,607  
Held-to-maturity Securities, debt maturities, after one year through five, Amortized Cost 55,351  
Held-to-maturity Securities, debt maturities, after five year through ten, Amortized Cost 658,457  
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost 3,851,645  
Held-to-maturity Securities, Amortized cost [2] 4,565,453 $ 3,698,098
U.S. Government Agency Securities [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale Securities, debt maturities, within one year, Fair Value [1] 1,657  
Available-for-sale Securities, debt maturities, after one year through five, Fair Value [1] 3,508  
Available-for-sale Securities, debt maturities, Fair Value [1] 5,165  
State And Municipal Securities [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale Securities, debt maturities, within one year, Fair Value [1] 395  
Available-for-sale Securities, debt maturities, after five through ten years, fair value [1] 18,272  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value [1] 50,209  
Available-for-sale Securities, debt maturities, Fair Value [1] 68,876  
Corporate Fixed Income Securities [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale Securities, debt maturities, within one year, Fair Value [1] 35,223  
Available-for-sale Securities, debt maturities, after one year through five, Fair Value [1] 714,520  
Available-for-sale Securities, debt maturities, after five through ten years, fair value [1] 427,572  
Available-for-sale Securities, debt maturities, Fair Value [1] 1,177,315  
Asset-Backed Securities [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale Securities, debt maturities, after five through ten years, fair value [1] 244,090  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value [1] 1,533,261  
Available-for-sale Securities, debt maturities, Fair Value [1] 1,777,351  
Held-to-maturity Securities, debt maturities, after five year through ten, Amortized Cost 478,024  
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost 2,787,496  
Held-to-maturity Securities, Amortized cost 3,265,520  
Mortgage Backed Securities [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale Securities, debt maturities, after five through ten years, fair value 6,194  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value 313,178  
Held-to-maturity Securities, debt maturities, after five year through ten, Amortized Cost 180,433  
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost 1,064,149  
Mortgage Backed Securities [Member] | Agency [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale Securities, debt maturities, after one year through five, Fair Value [1] 1,528  
Available-for-sale Securities, debt maturities, after five through ten years, fair value [1] 6,194  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value [1] 243,086  
Available-for-sale Securities, debt maturities, Fair Value [1] 250,808  
Held-to-maturity Securities, debt maturities, after five year through ten, Amortized Cost 180,433  
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost 1,064,149  
Held-to-maturity Securities, Amortized cost [2] 1,244,582 1,334,833
Mortgage Backed Securities [Member] | Commercial [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Availably-for-sale Securities, debt maturities, after ten years, Fair Value [1] 68,823  
Available-for-sale Securities, debt maturities, Fair Value [1] 68,823  
Held-to-maturity Securities, debt maturities, after one year through five, Amortized Cost 55,351  
Held-to-maturity Securities, Amortized cost [2] 55,351 $ 58,971
Mortgage Backed Securities [Member] | Non-Agency [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Availably-for-sale Securities, debt maturities, after ten years, Fair Value [1] 1,269  
Available-for-sale Securities, debt maturities, Fair Value [1] $ 1,269  
[1] Due to the immaterial amount of income recognized on tax-exempt securities, yields were not calculated on a tax-equivalent basis.
[2] Held-to-maturity securities are carried in the consolidated statements of financial condition at amortized cost, and the changes in the value of these securities, other than impairment charges, are not reported on the consolidated financial statements.