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Available-For-Sale And Held-To-Maturity Securities (Contractual Maturities) (Details) - USD ($)
$ in Thousands
Sep. 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 $ 154,255 [1] $ 6,871
Available-for-sale Securities, debt maturities, after one year through five, Fair Value [1] 408,300  
Available-for-sale Securities, debt maturities, after five through ten years, fair value 527,815 [1] 411,680
Availably-for-sale Securities, debt maturities, after ten years, Fair Value 1,733,888 [1] 2,176,517
Available-for-sale Securities, debt maturities, Fair Value 2,824,258 [1] 3,254,737
Held-to-maturity Securities, debt maturities, after five year through ten, Amortized Cost 1,302,344 598,250
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost 2,088,832 2,257,969
Held-to-maturity Securities, Amortized cost 3,397,713 $ 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] 2,318  
Available-for-sale Securities, debt maturities, after one year through five, Fair Value [1] 2,312  
Available-for-sale Securities, debt maturities, Fair Value [1] 4,630  
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] 2,459  
Available-for-sale Securities, debt maturities, Fair Value [1] 2,459  
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] 127,204  
Available-for-sale Securities, debt maturities, after one year through five, Fair Value [1] 405,522  
Available-for-sale Securities, debt maturities, after five through ten years, fair value [1] 55,732  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value [1] 17,097  
Available-for-sale Securities, debt maturities, Fair Value [1] 605,555  
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] 445,607  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value [1] 979,233  
Available-for-sale Securities, debt maturities, Fair Value [1] 1,424,840  
Held-to-maturity Securities, debt maturities, after one year through five, Amortized Cost 6,537  
Held-to-maturity Securities, debt maturities, after five year through ten, Amortized Cost 1,302,344  
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost 2,088,832  
Held-to-maturity Securities, Amortized cost 3,397,713  
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] 11  
Available-for-sale Securities, debt maturities, after one year through five, Fair Value [1] 444  
Available-for-sale Securities, debt maturities, after five through ten years, fair value [1] 24,017  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value [1] 657,702  
Available-for-sale Securities, debt maturities, Fair Value [1] 682,174  
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],[2] 18,656  
Available-for-sale Securities, debt maturities, after one year through five, Fair Value [1],[2] 22  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value [1],[2] 79,143  
Available-for-sale Securities, debt maturities, Fair Value [1],[2] 97,821  
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] 6,066  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value [1] 713  
Available-for-sale Securities, debt maturities, Fair Value [1] $ 6,779  
[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.