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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, 2019
Dec. 31, 2018
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale Securities, Amortized cost $ 3,024,611 $ 3,125,574
Available for sale securities, unrealized gains [1] 3,027 777
Available-for-sale Securities, Gross unrealized losses [1] (23,871) (55,904)
Available-for-sale securities 3,003,767 3,070,447
Held-to-maturity Securities, Amortized cost [2] 4,103,562 4,218,854
Held-to-maturity Securities, Gross unrealized gains [1],[2] 8,479 6,077
Held-to-maturity Securities, Gross unrealized losses [1],[2] (55,196) (102,024)
Held-to-maturity securities, Estimated fair value [2] 4,056,845 4,122,907
U.S. Government Agency Securities [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale Securities, Amortized cost 5,367 5,237
Available for sale securities, unrealized gains [1] 23 13
Available-for-sale Securities, Gross unrealized losses [1] (22) (35)
Available-for-sale securities 5,368 5,215
State And Municipal Securities [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale Securities, Amortized cost 49,011 72,487
Available for sale securities, unrealized gains [1] 107  
Available-for-sale Securities, Gross unrealized losses [1]   (4,261)
Available-for-sale securities 49,118 68,226
Mortgage Backed Securities [Member] | Agency [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale Securities, Amortized cost 216,959 234,292
Available for sale securities, unrealized gains [1] 325 88
Available-for-sale Securities, Gross unrealized losses [1] (1,867) (3,972)
Available-for-sale securities 215,417 230,408
Held-to-maturity Securities, Amortized cost [2] 1,168,095 1,198,442
Held-to-maturity Securities, Gross unrealized gains [1],[2] 4,841 1,307
Held-to-maturity Securities, Gross unrealized losses [1],[2] (16,346) (31,689)
Held-to-maturity securities, Estimated fair value [2] 1,156,590 1,168,060
Mortgage Backed Securities [Member] | Commercial [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale Securities, Amortized cost 74,117 74,411
Available for sale securities, unrealized gains [1] 4 4
Available-for-sale Securities, Gross unrealized losses [1] (2,744) (4,700)
Available-for-sale securities 71,377 69,715
Held-to-maturity Securities, Amortized cost [2] 37,739 51,524
Held-to-maturity Securities, Gross unrealized gains [1],[2] 336 185
Held-to-maturity securities, Estimated fair value [2] 38,075 51,709
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 1,176 1,245
Available-for-sale Securities, Gross unrealized losses [1] (28) (26)
Available-for-sale securities 1,148 1,219
Corporate Fixed Income Securities [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale Securities, Amortized cost 950,997 958,406
Available for sale securities, unrealized gains [1] 2,007  
Available-for-sale Securities, Gross unrealized losses [1] (5,416) (26,802)
Available-for-sale securities 947,588 931,604
Asset-Backed Securities [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale Securities, Amortized cost 1,726,984 1,779,496
Available for sale securities, unrealized gains [1] 561 672
Available-for-sale Securities, Gross unrealized losses [1] (13,794) (16,108)
Available-for-sale securities 1,713,751 1,764,060
Held-to-maturity Securities, Amortized cost [2] 2,897,728 2,968,888
Held-to-maturity Securities, Gross unrealized gains [1],[2] 3,302 4,585
Held-to-maturity Securities, Gross unrealized losses [1],[2] (38,850) (70,335)
Held-to-maturity securities, Estimated fair value [2] $ 2,862,180 $ 2,903,138
[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.