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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
Jun. 30, 2021
Dec. 31, 2020
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale Securities, Amortized cost $ 2,241,627 $ 2,184,339
Available for sale securities, unrealized gains [1] 44,640 51,549
Available-for-sale Securities, Gross unrealized losses [1] (6,110) (5,591)
Available-for-sale securities 2,280,157 2,230,297
Held-to-maturity Securities, Amortized cost 4,987,612 4,117,384
Held-to-maturity securities, Estimated fair value 4,992,139 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 3,148 4,293
Available for sale securities, unrealized gains [1] 32 68
Available-for-sale securities 3,180 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 2,384 2,395
Available for sale securities, unrealized gains [1] 46 58
Available-for-sale securities 2,430 2,453
Agency Mortgage-Backed Securities [Member] | Agency Securities    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale Securities, Amortized cost 1,000,745 777,025
Available for sale securities, unrealized gains [1] 14,825 16,401
Available-for-sale Securities, Gross unrealized losses [1] (3,694) (16)
Available-for-sale securities 1,011,876 793,410
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 77,413 91,237
Available for sale securities, unrealized gains [1] 3,171 4,376
Available-for-sale Securities, Gross unrealized losses [1] (23)  
Available-for-sale securities 80,561 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 1,754 4,550
Available for sale securities, unrealized gains [1]   28
Available-for-sale Securities, Gross unrealized losses [1] (2) (9)
Available-for-sale securities 1,752 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 787,357 604,662
Available for sale securities, unrealized gains [1] 22,851 27,096
Available-for-sale Securities, Gross unrealized losses [1] (639)  
Available-for-sale securities 809,569 631,758
Asset-Backed Securities [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale Securities, Amortized cost 368,826 700,177
Available for sale securities, unrealized gains [1] 3,715 3,522
Available-for-sale Securities, Gross unrealized losses [1] (1,752) (5,566)
Available-for-sale securities 370,789 698,133
Held-to-maturity Securities, Amortized cost [2] 4,987,612 4,117,384
Held-to-maturity Securities, Gross unrealized gains [2] 10,399 8,111
Held-to-maturity Securities, Gross unrealized losses [2] (5,872) (17,535)
Held-to-maturity securities, Estimated fair value [2] $ 4,992,139 $ 4,107,960
[1] Unrealized gains/(losses) related to available-for-sale securities are reported in accumulated other comprehensive loss.
[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.