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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
Sep. 30, 2018
Dec. 31, 2017
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale Securities, Amortized cost $ 3,393,128 $ 3,777,458
Available for sale securities, unrealized gains [1] 5,688 16,839
Available-for-sale Securities, Gross unrealized losses [1] (49,209) (20,789)
Available-for-sale securities 3,349,607 3,773,508
Held-to-maturity Securities, Amortized cost [2] 4,565,453 3,698,098
Held-to-maturity Securities, Gross unrealized gains [2] 4,940 30,487
Held-to-maturity Securities, Gross unrealized losses [2] (64,008) (18,107)
Held-to-maturity securities, Estimated fair value [2] 4,506,385 3,710,478
U.S. Government Agency Securities [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale Securities, Amortized cost 5,226 5,022
Available-for-sale Securities, Gross unrealized losses [1] (61) (39)
Available-for-sale securities 5,165 4,983
State And Municipal Securities [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale Securities, Amortized cost 73,253 74,691
Available-for-sale Securities, Gross unrealized losses [1] (4,377) (4,132)
Available-for-sale securities 68,876 70,559
Mortgage Backed Securities [Member] | Agency [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale Securities, Amortized cost 256,120 308,409
Available for sale securities, unrealized gains [1] 29 102
Available-for-sale Securities, Gross unrealized losses [1] (5,341) (2,981)
Available-for-sale securities 250,808 305,530
Held-to-maturity Securities, Amortized cost [2] 1,244,582 1,334,833
Held-to-maturity Securities, Gross unrealized gains [2]   13,621
Held-to-maturity Securities, Gross unrealized losses [2] (48,907) (16,208)
Held-to-maturity securities, Estimated fair value [2] 1,195,675 1,332,246
Mortgage Backed Securities [Member] | Commercial [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale Securities, Amortized cost 74,698 75,548
Available for sale securities, unrealized gains [1] 8 28
Available-for-sale Securities, Gross unrealized losses [1] (5,883) (3,088)
Available-for-sale securities 68,823 72,488
Held-to-maturity Securities, Amortized cost [2] 55,351 58,971
Held-to-maturity Securities, Gross unrealized gains [2]   1,313
Held-to-maturity Securities, Gross unrealized losses [2] (343)  
Held-to-maturity securities, Estimated fair value [2] 55,008 60,284
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 1,281 1,568
Available-for-sale Securities, Gross unrealized losses [1] (12)  
Available-for-sale securities 1,269 1,568
Corporate Fixed Income Securities [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale Securities, Amortized cost 1,200,498 1,213,262
Available for sale securities, unrealized gains [1] 2,542 3,832
Available-for-sale Securities, Gross unrealized losses [1] (25,725) (5,652)
Available-for-sale securities 1,177,315 1,211,442
Held-to-maturity Securities, Amortized cost [2]   40,011
Held-to-maturity Securities, Gross unrealized gains [2]   27
Held-to-maturity Securities, Gross unrealized losses [2]   (37)
Held-to-maturity securities, Estimated fair value [2]   40,001
Asset-Backed Securities [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale Securities, Amortized cost 1,782,052 2,098,958
Available for sale securities, unrealized gains [1] 3,109 12,877
Available-for-sale Securities, Gross unrealized losses [1] (7,810) (4,897)
Available-for-sale securities 1,777,351 2,106,938
Held-to-maturity Securities, Amortized cost [2] 3,265,520 2,264,283
Held-to-maturity Securities, Gross unrealized gains [2] 4,940 15,526
Held-to-maturity Securities, Gross unrealized losses [2] (14,758) (1,862)
Held-to-maturity securities, Estimated fair value [2] $ 3,255,702 $ 2,277,947
[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.