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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, 2020
Dec. 31, 2019
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale Securities, Amortized cost $ 3,464,269 $ 3,254,041
Available for sale securities, unrealized gains [1] 27,662 15,489
Available-for-sale Securities, Gross unrealized losses [1] (125,841) (14,793)
Available-for-sale securities 3,366,090 3,254,737
Held-to-maturity Securities, Amortized cost 3,085,824 2,856,219
Held-to-maturity securities, Estimated fair value 2,697,830 2,827,883
U.S. Government Agency Securities [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale Securities, Amortized cost 5,534 5,028
Available for sale securities, unrealized gains [1] 116 39
Available-for-sale securities 5,650 5,067
State And Municipal Securities [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale Securities, Amortized cost 17,079 24,198
Available for sale securities, unrealized gains [1] 63 99
Available-for-sale securities 17,142 24,297
Mortgage Backed Securities [Member] | Agency [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale Securities, Amortized cost 807,043 840,659
Available for sale securities, unrealized gains [1] 22,545 3,070
Available-for-sale Securities, Gross unrealized losses [1] (155) (5,851)
Available-for-sale securities 829,433 837,878
Mortgage Backed Securities [Member] | Commercial [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale Securities, Amortized cost 108,144 109,982
Available for sale securities, unrealized gains [1] 524 269
Available-for-sale Securities, Gross unrealized losses [1] (482) (714)
Available-for-sale securities 108,186 109,537
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 8,620 9,731
Available for sale securities, unrealized gains [1] 118 50
Available-for-sale Securities, Gross unrealized losses [1] (94) (23)
Available-for-sale securities 8,644 9,758
Corporate Fixed Income Securities [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale Securities, Amortized cost 741,219 664,028
Available for sale securities, unrealized gains [1] 3,460 11,283
Available-for-sale Securities, Gross unrealized losses [1] (17,089)  
Available-for-sale securities 727,590 675,311
Asset-Backed Securities [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale Securities, Amortized cost 1,776,630 1,600,415
Available for sale securities, unrealized gains [1] 836 679
Available-for-sale Securities, Gross unrealized losses [1] (108,021) (8,205)
Available-for-sale securities 1,669,445 1,592,889
Held-to-maturity Securities, Amortized cost [2] 3,085,824 2,856,219
Held-to-maturity Securities, Gross unrealized gains [2] 1,458 5,960
Held-to-maturity Securities, Gross unrealized losses [2] (389,452) (34,296)
Held-to-maturity securities, Estimated fair value [2] $ 2,697,830 $ 2,827,883
[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.