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Available-For-Sale And Held-To-Maturity Securities (Contractual Maturities) (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale Securities, debt maturities, within one year, Fair Value [1] $ 2,508  
Available-for-sale Securities, debt maturities, after one year through five, Fair Value [1] 648,415  
Available-for-sale Securities, debt maturities, after five through ten years, fair value [1] 562,621  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value [1] 1,790,223  
Available-for-sale Securities, debt maturities, Fair Value [1] 3,003,767  
Held-to-maturity Securities, debt maturities, after one year through five, Amortized Cost 48,669  
Held-to-maturity Securities, debt maturities, after five year through ten, Amortized Cost 636,128  
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost 3,418,765  
Held-to-maturity Securities, Amortized cost [2] 4,103,562 $ 4,218,854
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] 1,910  
Available-for-sale Securities, debt maturities, after one year through five, Fair Value [1] 3,458  
Available-for-sale Securities, debt maturities, Fair Value [1] 5,368  
State And Municipal 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] 18,171  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value [1] 30,947  
Available-for-sale Securities, debt maturities, Fair Value [1] 49,118  
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] 598  
Available-for-sale Securities, debt maturities, after one year through five, Fair Value [1] 643,640  
Available-for-sale Securities, debt maturities, after five through ten years, fair value [1] 303,350  
Available-for-sale Securities, debt maturities, Fair Value [1] 947,588  
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] 235,493  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value [1] 1,478,258  
Available-for-sale Securities, debt maturities, Fair Value [1] 1,713,751  
Held-to-maturity Securities, debt maturities, after five year through ten, Amortized Cost 475,640  
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost 2,422,088  
Held-to-maturity Securities, Amortized cost 2,897,728  
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 5,607  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value 281,018  
Held-to-maturity Securities, debt maturities, after five year through ten, Amortized Cost 160,488  
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost 996,677  
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] 1,317  
Available-for-sale Securities, debt maturities, after five through ten years, fair value [1] 5,607  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value [1] 208,493  
Available-for-sale Securities, debt maturities, Fair Value [1] 215,417  
Held-to-maturity Securities, debt maturities, after one year through five, Amortized Cost 10,930  
Held-to-maturity Securities, debt maturities, after five year through ten, Amortized Cost 160,488  
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost 996,677  
Held-to-maturity Securities, Amortized cost [2] 1,168,095 1,198,442
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] 71,377  
Available-for-sale Securities, debt maturities, Fair Value [1] 71,377  
Held-to-maturity Securities, debt maturities, after one year through five, Amortized Cost 37,739  
Held-to-maturity Securities, Amortized cost [2] 37,739 $ 51,524
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] 1,148  
Available-for-sale Securities, debt maturities, Fair Value [1] $ 1,148  
[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.