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Available-For-Sale And Held-To-Maturity Securities (Contractual Maturities) (Details) - USD ($)
$ in Thousands
Jun. 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] $ 76,617  
Available-for-sale Securities, debt maturities, after one year through five, Fair Value [1] 647,061  
Available-for-sale Securities, debt maturities, after five through ten years, fair value [1] 790,509  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value [1] 1,961,249  
Available-for-sale Securities, debt maturities, Fair Value [1] 3,475,436  
Held-to-maturity Securities, debt maturities, after one year through five, Amortized Cost 57,734  
Held-to-maturity Securities, debt maturities, after five year through ten, Amortized Cost 718,259  
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost 3,743,992  
Held-to-maturity Securities, Amortized cost [2] 4,519,985 $ 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] 1,090  
Available-for-sale Securities, debt maturities, after one year through five, Fair Value [1] 3,959  
Available-for-sale Securities, debt maturities, Fair Value [1] 5,049  
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] 354  
Available-for-sale Securities, debt maturities, after five through ten years, fair value [1] 18,444  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value [1] 50,663  
Available-for-sale Securities, debt maturities, Fair Value [1] 69,461  
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] 75,173  
Available-for-sale Securities, debt maturities, after one year through five, Fair Value [1] 643,102  
Available-for-sale Securities, debt maturities, after five through ten years, fair value [1] 552,341  
Available-for-sale Securities, debt maturities, Fair Value [1] 1,270,616  
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] 218,758  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value [1] 1,579,423  
Available-for-sale Securities, debt maturities, Fair Value [1] 1,798,181  
Held-to-maturity Securities, debt maturities, after five year through ten, Amortized Cost 526,011  
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost 2,635,864  
Held-to-maturity Securities, Amortized cost 3,161,875  
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 966  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value 331,163  
Held-to-maturity Securities, debt maturities, after five year through ten, Amortized Cost 192,248  
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost 1,108,128  
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 five through ten years, fair value [1] 966  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value [1] 260,277  
Available-for-sale Securities, debt maturities, Fair Value [1] 261,243  
Held-to-maturity Securities, debt maturities, after five year through ten, Amortized Cost 192,248  
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost 1,108,128  
Held-to-maturity Securities, Amortized cost [2] 1,300,376 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] 69,480  
Available-for-sale Securities, debt maturities, Fair Value [1] 69,480  
Held-to-maturity Securities, debt maturities, after one year through five, Amortized Cost 57,734  
Held-to-maturity Securities, Amortized cost [2] 57,734 $ 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] 1,406  
Available-for-sale Securities, debt maturities, Fair Value [1] $ 1,406  
[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.