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Available-For-Sale And Held-To-Maturity Securities (Contractual Maturities) (Details) - USD ($)
$ in Thousands
Sep. 30, 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 $ 1,897 [1] $ 5,855
Available-for-sale Securities, debt maturities, after one year through five, Fair Value [1] 646,631  
Available-for-sale Securities, debt maturities, after five through ten years, fair value 415,878 [1] 458,442
Availably-for-sale Securities, debt maturities, after ten years, Fair Value 2,384,395 [1] 1,980,827
Available-for-sale Securities, debt maturities, Fair Value 3,448,801 [1] 3,070,447
Held-to-maturity Securities, debt maturities, after five year through ten, Amortized Cost 495,850 536,717
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost 2,385,634 3,630,613
Held-to-maturity Securities, Amortized cost 2,881,484 4,218,854 [2]
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] 1,597  
Available-for-sale Securities, debt maturities, after one year through five, Fair Value [1] 3,013  
Available-for-sale Securities, debt maturities, Fair Value [1] 4,610  
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] 5,854  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value [1] 25,656  
Available-for-sale Securities, debt maturities, Fair Value [1] 31,510  
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] 300  
Available-for-sale Securities, debt maturities, after one year through five, Fair Value [1] 597,094  
Available-for-sale Securities, debt maturities, after five through ten years, fair value [1] 77,484  
Available-for-sale Securities, debt maturities, Fair Value [1] 674,878  
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] 306,077  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value [1] 1,418,957  
Available-for-sale Securities, debt maturities, Fair Value [1] 1,725,034  
Held-to-maturity Securities, debt maturities, after five year through ten, Amortized Cost 495,850  
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost 2,385,634  
Held-to-maturity Securities, Amortized cost 2,881,484  
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] 950  
Available-for-sale Securities, debt maturities, after five through ten years, fair value [1] 26,463  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value [1] 860,347  
Available-for-sale Securities, debt maturities, Fair Value [1] 887,760  
Held-to-maturity Securities, Amortized cost [2]   1,198,442
Mortgage Backed Securities [Member] | Commercial [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] 36,091  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value [1] 78,407  
Available-for-sale Securities, debt maturities, Fair Value [1] 114,498  
Held-to-maturity Securities, Amortized cost [2]   $ 51,524
Mortgage Backed Securities [Member] | Non-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] 9,483  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value [1] 1,028  
Available-for-sale Securities, debt maturities, Fair Value [1] $ 10,511  
[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.