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Available-For-Sale And Held-To-Maturity Securities (Contractual Maturities) (Details) - USD ($)
$ in Thousands
Dec. 31, 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 $ 6,871 [1] $ 5,855
Available-for-sale Securities, debt maturities, after one year through five, Fair Value [1] 659,669  
Available-for-sale Securities, debt maturities, after five through ten years, fair value 411,680 [1] 458,442
Availably-for-sale Securities, debt maturities, after ten years, Fair Value 2,176,517 [1] 1,980,827
Available-for-sale Securities, debt maturities, Fair Value 3,254,737 [1] 3,070,447
Held-to-maturity Securities, debt maturities, after five year through ten, Amortized Cost 598,250 536,717
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost 2,257,969 3,630,613
Held-to-maturity Securities, Amortized cost 2,856,219 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] 1,749  
Available-for-sale Securities, debt maturities, after one year through five, Fair Value [1] 3,318  
Available-for-sale Securities, debt maturities, Fair Value [1] 5,067  
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] 5,875  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value [1] 18,422  
Available-for-sale Securities, debt maturities, Fair Value [1] 24,297  
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] 5,122  
Available-for-sale Securities, debt maturities, after one year through five, Fair Value [1] 614,283  
Available-for-sale Securities, debt maturities, after five through ten years, fair value [1] 55,906  
Available-for-sale Securities, debt maturities, Fair Value [1] 675,311  
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] 325,540  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value [1] 1,267,349  
Available-for-sale Securities, debt maturities, Fair Value [1] 1,592,889  
Held-to-maturity Securities, debt maturities, after five year through ten, Amortized Cost 598,250  
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost 2,257,969  
Held-to-maturity Securities, Amortized cost 2,856,219  
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] 819  
Available-for-sale Securities, debt maturities, after five through ten years, fair value [1] 24,359  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value [1] 812,700  
Available-for-sale Securities, debt maturities, Fair Value [1] 837,878  
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] 32,457  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value [1] 77,080  
Available-for-sale Securities, debt maturities, Fair Value [1] 109,537  
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] 8,792  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value [1] 966  
Available-for-sale Securities, debt maturities, Fair Value [1] $ 9,758  
[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.