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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
Mar. 31, 2022
Dec. 31, 2021
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale Securities, Amortized cost $ 2,021,836 $ 2,104,513
Available for sale securities, unrealized gains [1] 5,354 26,406
Available-for-sale Securities, Gross unrealized losses [1] (101,046) (17,026)
Available-for-sale securities 1,926,144 [2] 2,113,893
Held-to-maturity Securities, Amortized cost [3] 5,316,296 5,348,558
Held-to-maturity Securities, Gross unrealized gains [3] 3,557 7,659
Held-to-maturity Securities, Gross unrealized losses [3] (68,321) (12,736)
Held-to-maturity securities, Estimated fair value [3] 5,251,532 5,343,481
U.S. Government Agency Securities [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale Securities, Amortized cost 3,010 1,800
Available for sale securities, unrealized gains [1] 2 8
Available-for-sale Securities, Gross unrealized losses [1] (90)  
Available-for-sale securities 2,922 1,808
State And Municipal Securities [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale Securities, Amortized cost 2,366 2,372
Available for sale securities, unrealized gains [1]   27
Available-for-sale securities 2,366 2,399
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 909,052 954,021
Available for sale securities, unrealized gains [1] 244 7,181
Available-for-sale Securities, Gross unrealized losses [1] (55,350) (9,016)
Available-for-sale securities 853,946 [2] 952,186
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 72,421 72,765
Available for sale securities, unrealized gains [1]   1,220
Available-for-sale Securities, Gross unrealized losses [1] (2,569)  
Available-for-sale securities 69,852 [2] 73,985
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 501 564
Available for sale securities, unrealized gains [1] 3 4
Available-for-sale securities 504 [2] 568
Corporate Fixed Income Securities [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale Securities, Amortized cost 764,982 783,289
Available for sale securities, unrealized gains [1] 2,041 14,385
Available-for-sale Securities, Gross unrealized losses [1] (36,149) (5,781)
Available-for-sale securities 730,874 791,893
Asset-Backed Securities [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale Securities, Amortized cost 269,504 289,702
Available for sale securities, unrealized gains [1] 3,064 3,581
Available-for-sale Securities, Gross unrealized losses [1] (6,888) (2,229)
Available-for-sale securities 265,680 [2] $ 291,054
Held-to-maturity Securities, Amortized cost $ 5,316,296  
[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.