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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 | Dec. 31, 2016 | Dec. 31, 2015
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Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |  |
Available-for-sale Securities, Amortized cost |  | $ 3,190,090 | $ 1,641,398
Available for sale securities, unrealized gains | [1] | 11,634 | 1,807
Available-for-sale Securities, Gross unrealized losses | [1] | (20,411) | (13,298)
Available-for-sale securities |  | 3,181,313 | 1,629,907
Held-to-maturity Securities, Amortized cost | [2] | 3,038,405 | 1,855,399
Held-to-maturity Securities, Gross unrealized gains | [1],[2] | 22,595 | 27,254
Held-to-maturity Securities, Gross unrealized losses | [1],[2] | (20,446) | (7,655)
Held-to-maturity securities, Estimated fair value | [2] | 3,040,554 | 1,874,998
U.S. Government Agency Securities [Member] |  |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |  |
Available-for-sale Securities, Amortized cost |  | 4,213 | 1,700
Available for sale securities, unrealized gains | [1] | 2 | 1
Available-for-sale Securities, Gross unrealized losses | [1] | (18) | (3)
Available-for-sale securities |  | 4,197 | 1,698
State And Municipal Securities [Member] |  |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |  |
Available-for-sale Securities, Amortized cost |  | 76,066 | 75,953
Available for sale securities, unrealized gains | [1] |  | 28
Available-for-sale Securities, Gross unrealized losses | [1] | (3,576) | (1,814)
Available-for-sale securities |  | 72,490 | 74,167
Corporate Fixed Income Securities [Member] |  |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |  |
Available-for-sale Securities, Amortized cost |  | 830,695 | 321,017
Available for sale securities, unrealized gains | [1] | 1,418 | 743
Available-for-sale Securities, Gross unrealized losses | [1] | (8,602) | (2,352)
Available-for-sale securities |  | 823,511 | 319,408
Held-to-maturity Securities, Amortized cost | [2] | 40,078 | 40,145
Held-to-maturity Securities, Gross unrealized gains | [1],[2] | 30 |
Held-to-maturity Securities, Gross unrealized losses | [1],[2] |  | (396)
Held-to-maturity securities, Estimated fair value | [2] | 40,108 | 39,749
Asset-Backed Securities [Member] |  |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |  |
Available-for-sale Securities, Amortized cost |  | 1,858,929 | 922,563
Available for sale securities, unrealized gains | [1] | 9,857 | 774
Available-for-sale Securities, Gross unrealized losses | [1] | (1,068) | (7,424)
Available-for-sale securities |  | 1,867,718 | 915,913
Held-to-maturity Securities, Amortized cost | [2] | 1,370,300 | 496,996
Held-to-maturity Securities, Gross unrealized gains | [1],[2] | 6,242 | 2,076
Held-to-maturity Securities, Gross unrealized losses | [1],[2] | (3,396) | (4,139)
Held-to-maturity securities, Estimated fair value | [2] | 1,373,146 | 494,933
Mortgage Backed Securities [Member] | Agency [Member] |  |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |  |
Available-for-sale Securities, Amortized cost |  | 340,738 | 306,309
Available for sale securities, unrealized gains | [1] | 298 | 125
Available-for-sale Securities, Gross unrealized losses | [1] | (2,304) | (1,541)
Available-for-sale securities |  | 338,732 | 304,893
Held-to-maturity Securities, Amortized cost | [2] | 1,567,758 | 1,257,808
Held-to-maturity Securities, Gross unrealized gains | [1],[2] | 14,537 | 23,346
Held-to-maturity Securities, Gross unrealized losses | [1],[2] | (17,037) | (3,105)
Held-to-maturity securities, Estimated fair value | [2] | 1,565,258 | 1,278,049
Mortgage Backed Securities [Member] | Commercial [Member] |  |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |  |
Available-for-sale Securities, Amortized cost |  | 77,417 | 11,177
Available for sale securities, unrealized gains | [1] | 59 | 134
Available-for-sale Securities, Gross unrealized losses | [1] | (4,703) | (1)
Available-for-sale securities |  | 72,773 | 11,310
Held-to-maturity Securities, Amortized cost | [2] | 59,581 | 59,521
Held-to-maturity Securities, Gross unrealized gains | [1],[2] | 1,786 | 1,832
Held-to-maturity securities, Estimated fair value | [2] | 61,367 | 61,353
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 |  | 2,032 | 2,679
Available for sale securities, unrealized gains | [1] |  | 2
Available-for-sale Securities, Gross unrealized losses | [1] | (140) | (163)
Available-for-sale securities |  | 1,892 | 2,518
Held-to-maturity Securities, Amortized cost | [2] | 688 | 929
Held-to-maturity Securities, Gross unrealized losses | [1],[2] | (13) | (15)
Held-to-maturity securities, Estimated fair value | [2] | $ 675 | $ 914
[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.

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