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Available-For-Sale And Held-To-Maturity Securities (Schedule Of Amortized Cost And Fair Values Of The Available For Sale Securities And Held To Maturity Securities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale Securities, Amortized cost $ 2,104,513 $ 2,184,339
Available for sale securities, unrealized gains [1] 26,406 51,549
Available-for-sale Securities, Gross unrealized losses [1] (17,026) (5,591)
Available-for-sale securities 2,113,893 [2] 2,230,297
Held-to-maturity Securities, Amortized cost 5,348,558 [3] 4,117,384
Held-to-maturity Securities, Gross unrealized gains [3] 7,659  
Held-to-maturity Securities, Gross unrealized losses [3] (12,736)  
Held-to-maturity securities, Estimated fair value 5,343,481 [3] 4,107,960
U.S. Government Agency Securities [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale Securities, Amortized cost 1,800 4,293
Available for sale securities, unrealized gains [1] 8 68
Available-for-sale securities 1,808 4,361
State And Municipal Securities [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale Securities, Amortized cost 2,372 2,395
Available for sale securities, unrealized gains [1] 27 58
Available-for-sale securities 2,399 2,453
Agency Mortgage-Backed Securities [Member] | Agency Securities [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale Securities, Amortized cost 954,021 777,025
Available for sale securities, unrealized gains [1] 7,181 16,401
Available-for-sale Securities, Gross unrealized losses [1] (9,016) (16)
Available-for-sale securities 952,186 [2] 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, Amortized cost 72,765 91,237
Available for sale securities, unrealized gains [1] 1,220 4,376
Available-for-sale securities 73,985 [2] 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, Amortized cost 564 4,550
Available for sale securities, unrealized gains [1] 4 28
Available-for-sale Securities, Gross unrealized losses [1]   (9)
Available-for-sale securities 568 [2] 4,569
Corporate Fixed Income Securities [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale Securities, Amortized cost 783,289 604,662
Available for sale securities, unrealized gains [1] 14,385 27,096
Available-for-sale Securities, Gross unrealized losses [1] (5,781)  
Available-for-sale securities 791,893 631,758
Asset-Backed Securities [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale Securities, Amortized cost 289,702 700,177
Available for sale securities, unrealized gains [1] 3,581 3,522
Available-for-sale Securities, Gross unrealized losses [1] (2,229) (5,566)
Available-for-sale securities 291,054 698,133
Held-to-maturity Securities, Amortized cost $ 5,348,558 4,117,384 [3]
Held-to-maturity Securities, Gross unrealized gains [3]   8,111
Held-to-maturity Securities, Gross unrealized losses [3]   (17,535)
Held-to-maturity securities, Estimated fair value [3]   $ 4,107,960
[1] Unrealized gains/(losses) related to available-for-sale securities are reported in accumulated other comprehensive income.
[2] Due to the immaterial amount of income recognized on tax-exempt securities, yields were not calculated on a tax-equivalent basis.
[3] 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.