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Available-For-Sale And Held-To-Maturity Securities (Contractual Maturities) (Details) - USD ($)
$ in Thousands
Dec. 31, 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 $ 144,362 [1] $ 6,871
Available-for-sale Securities, debt maturities, after one year through five, Fair Value [1] 403,764  
Available-for-sale Securities, debt maturities, after five through ten years, fair value 435,111 [1] 411,680
Availably-for-sale Securities, debt maturities, after ten years, Fair Value 1,247,060 [1] 2,176,517
Available-for-sale Securities, debt maturities, Fair Value 2,230,297 [1] 3,254,737
Held-to-maturity Securities, debt maturities, after five year through ten, Amortized Cost 1,932,439 598,250
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost 2,167,485 2,257,969
Held-to-maturity Securities, Amortized cost 4,117,384 $ 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] 2,518  
Available-for-sale Securities, debt maturities, after one year through five, Fair Value [1] 1,843  
Available-for-sale Securities, debt maturities, Fair Value [1] 4,361  
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] 2,453  
Available-for-sale Securities, debt maturities, Fair Value [1] 2,453  
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] 121,398  
Available-for-sale Securities, debt maturities, after one year through five, Fair Value [1] 401,550  
Available-for-sale Securities, debt maturities, after five through ten years, fair value [1] 108,810  
Available-for-sale Securities, debt maturities, Fair Value [1] 631,758  
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] 237,524  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value [1] 460,609  
Available-for-sale Securities, debt maturities, Fair Value [1] 698,133  
Held-to-maturity Securities, debt maturities, after one year through five, Amortized Cost 17,460  
Held-to-maturity Securities, debt maturities, after five year through ten, Amortized Cost 1,932,439  
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost 2,167,485  
Held-to-maturity Securities, Amortized cost 4,117,384  
Agency Mortgage-Backed Securities [Member] | Agency Securities    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale Securities, debt maturities, within one year, Fair Value [1] 3  
Available-for-sale Securities, debt maturities, after one year through five, Fair Value [1] 355  
Available-for-sale Securities, debt maturities, after five through ten years, fair value [1] 86,324  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value [1] 706,728  
Available-for-sale Securities, debt maturities, Fair Value [1] 793,410  
Agency Mortgage-Backed Securities [Member] | Commercial [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] 16,602  
Available-for-sale Securities, debt maturities, after one year through five, Fair Value [1] 16  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value [1] 78,995  
Available-for-sale Securities, debt maturities, Fair Value [1] 95,613  
Agency 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, within one year, Fair Value [1] 3,841  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value [1] 728  
Available-for-sale Securities, debt maturities, Fair Value [1] $ 4,569  
[1] Due to the immaterial amount of income recognized on tax-exempt securities, yields were not calculated on a tax-equivalent basis.