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Available-For-Sale And Held-To-Maturity Securities (Contractual Maturities) (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale Securities, debt maturities, within one year, Fair Value $ 47,352 [1] $ 6,871
Available-for-sale Securities, debt maturities, after one year through five, Fair Value [1] 479,579  
Available-for-sale Securities, debt maturities, after five through ten years, fair value 484,418 [1] 411,680
Availably-for-sale Securities, debt maturities, after ten years, Fair Value 2,161,140 [1] 2,176,517
Available-for-sale Securities, debt maturities, Fair Value 3,172,489 [1] 3,254,737
Held-to-maturity Securities, debt maturities, after five year through ten, Amortized Cost 853,300 598,250
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost 2,232,490 2,257,969
Held-to-maturity Securities, Amortized cost 3,085,790 $ 2,856,219
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] 1,915  
Available-for-sale Securities, debt maturities, after one year through five, Fair Value [1] 3,231  
Available-for-sale Securities, debt maturities, Fair Value [1] 5,146  
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] 2,461  
Available-for-sale Securities, debt maturities, Fair Value [1] 2,461  
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] 45,414  
Available-for-sale Securities, debt maturities, after one year through five, Fair Value [1] 443,135  
Available-for-sale Securities, debt maturities, after five through ten years, fair value [1] 69,420  
Available-for-sale Securities, debt maturities, Fair Value [1] 557,969  
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] 411,784  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value [1] 1,312,030  
Available-for-sale Securities, debt maturities, Fair Value [1] 1,723,814  
Held-to-maturity Securities, debt maturities, after five year through ten, Amortized Cost 853,300  
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost 2,232,490  
Held-to-maturity Securities, Amortized cost 3,085,790  
Mortgage Backed Securities [Member] | Agency [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] 23  
Available-for-sale Securities, debt maturities, after one year through five, Fair Value [1] 561  
Available-for-sale Securities, debt maturities, after five through ten years, fair value [1] 753  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value [1] 769,392  
Available-for-sale Securities, debt maturities, Fair Value [1] 770,729  
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],[2] 26,517  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value [1],[2] 78,930  
Available-for-sale Securities, debt maturities, Fair Value [1],[2] 105,447  
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] 6,135  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value [1] 788  
Available-for-sale Securities, debt maturities, Fair Value [1] $ 6,923  
[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.