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Available-For-Sale And Held-To-Maturity Securities (Contractual Maturities) (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
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Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |  |
Available-for-sale Securities, debt maturities, within one year, Fair Value | [1] | $ 2,508 |
Available-for-sale Securities, debt maturities, after one year through five, Fair Value | [1] | 648,415 |
Available-for-sale Securities, debt maturities, after five through ten years, fair value | [1] | 562,621 |
Availably-for-sale Securities, debt maturities, after ten years, Fair Value | [1] | 1,790,223 |
Available-for-sale Securities, debt maturities, Fair Value | [1] | 3,003,767 |
Held-to-maturity Securities, debt maturities, after one year through five, Amortized Cost |  | 48,669 |
Held-to-maturity Securities, debt maturities, after five year through ten, Amortized Cost |  | 636,128 |
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost |  | 3,418,765 |
Held-to-maturity Securities, Amortized cost | [2] | 4,103,562 | $ 4,218,854
U.S. Government Agency Securities [Member] |  |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |  |
Available-for-sale Securities, debt maturities, within one year, Fair Value | [1] | 1,910 |
Available-for-sale Securities, debt maturities, after one year through five, Fair Value | [1] | 3,458 |
Available-for-sale Securities, debt maturities, Fair Value | [1] | 5,368 |
State And Municipal Securities [Member] |  |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |  |
Available-for-sale Securities, debt maturities, after five through ten years, fair value | [1] | 18,171 |
Availably-for-sale Securities, debt maturities, after ten years, Fair Value | [1] | 30,947 |
Available-for-sale Securities, debt maturities, Fair Value | [1] | 49,118 |
Corporate Fixed Income Securities [Member] |  |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |  |
Available-for-sale Securities, debt maturities, within one year, Fair Value | [1] | 598 |
Available-for-sale Securities, debt maturities, after one year through five, Fair Value | [1] | 643,640 |
Available-for-sale Securities, debt maturities, after five through ten years, fair value | [1] | 303,350 |
Available-for-sale Securities, debt maturities, Fair Value | [1] | 947,588 |
Asset-Backed Securities [Member] |  |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |  |
Available-for-sale Securities, debt maturities, after five through ten years, fair value | [1] | 235,493 |
Availably-for-sale Securities, debt maturities, after ten years, Fair Value | [1] | 1,478,258 |
Available-for-sale Securities, debt maturities, Fair Value | [1] | 1,713,751 |
Held-to-maturity Securities, debt maturities, after five year through ten, Amortized Cost |  | 475,640 |
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost |  | 2,422,088 |
Held-to-maturity Securities, Amortized cost |  | 2,897,728 |
Mortgage Backed Securities [Member] |  |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |  |
Available-for-sale Securities, debt maturities, after five through ten years, fair value |  | 5,607 |
Availably-for-sale Securities, debt maturities, after ten years, Fair Value |  | 281,018 |
Held-to-maturity Securities, debt maturities, after five year through ten, Amortized Cost |  | 160,488 |
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost |  | 996,677 |
Mortgage Backed Securities [Member] | Agency [Member] |  |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |  |
Available-for-sale Securities, debt maturities, after one year through five, Fair Value | [1] | 1,317 |
Available-for-sale Securities, debt maturities, after five through ten years, fair value | [1] | 5,607 |
Availably-for-sale Securities, debt maturities, after ten years, Fair Value | [1] | 208,493 |
Available-for-sale Securities, debt maturities, Fair Value | [1] | 215,417 |
Held-to-maturity Securities, debt maturities, after one year through five, Amortized Cost |  | 10,930 |
Held-to-maturity Securities, debt maturities, after five year through ten, Amortized Cost |  | 160,488 |
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost |  | 996,677 |
Held-to-maturity Securities, Amortized cost | [2] | 1,168,095 | 1,198,442
Mortgage Backed Securities [Member] | Commercial [Member] |  |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |  |
Availably-for-sale Securities, debt maturities, after ten years, Fair Value | [1] | 71,377 |
Available-for-sale Securities, debt maturities, Fair Value | [1] | 71,377 |
Held-to-maturity Securities, debt maturities, after one year through five, Amortized Cost |  | 37,739 |
Held-to-maturity Securities, Amortized cost | [2] | 37,739 | $ 51,524
Mortgage Backed Securities [Member] | Non-Agency [Member] |  |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |  |
Availably-for-sale Securities, debt maturities, after ten years, Fair Value | [1] | 1,148 |
Available-for-sale Securities, debt maturities, Fair Value | [1] | $ 1,148 |
[1] | Due to the immaterial amount of income recognized on tax-exempt securities, yields were not calculated on a tax-equivalent basis.
[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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