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Available-For-Sale And Held-To-Maturity Securities (Contractual Maturities) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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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] | $ 184,021 |
Available-for-sale Securities, debt maturities, after one year through five, Fair Value | [1] | 545,825 |
Available-for-sale Securities, debt maturities, after five through ten years, fair value | [1] | 978,587 |
Availably-for-sale Securities, debt maturities, after ten years, Fair Value | [1] | 2,065,075 |
Available-for-sale Securities, debt maturities, Fair Value | [1] | 3,773,508 |
Held-to-maturity Securities, debt maturities, within one year, Amortized Cost |  | 40,011 |
Held-to-maturity Securities, debt maturities, after one year through five, Amortized Cost |  | 58,971 |
Held-to-maturity Securities, debt maturities, after five year through ten, Amortized Cost |  | 547,555 |
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost |  | 3,051,561 |
Held-to-maturity Securities, Amortized cost | [2] | 3,698,098 | $ 3,038,405
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] | 1,722 |
Available-for-sale Securities, debt maturities, after one year through five, Fair Value | [1] | 3,261 |
Available-for-sale Securities, debt maturities, Fair Value | [1] | 4,983 |
State And Municipal 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] | 274 |
Available-for-sale Securities, debt maturities, after one year through five, Fair Value | [1] | 84 |
Available-for-sale Securities, debt maturities, after five through ten years, fair value | [1] | 18,745 |
Availably-for-sale Securities, debt maturities, after ten years, Fair Value | [1] | 51,456 |
Available-for-sale Securities, debt maturities, Fair Value | [1] | 70,559 |
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] | 182,025 |
Available-for-sale Securities, debt maturities, after one year through five, Fair Value | [1] | 542,480 |
Available-for-sale Securities, debt maturities, after five through ten years, fair value | [1] | 486,937 |
Available-for-sale Securities, debt maturities, Fair Value | [1] | 1,211,442 |
Held-to-maturity Securities, debt maturities, within one year, Amortized Cost |  | 40,011 |
Held-to-maturity Securities, Amortized cost | [2] | 40,011 | 40,078
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] | 417,081 |
Availably-for-sale Securities, debt maturities, after ten years, Fair Value | [1] | 1,689,857 |
Available-for-sale Securities, debt maturities, Fair Value | [1] | 2,106,938 |
Held-to-maturity Securities, debt maturities, after five year through ten, Amortized Cost |  | 403,840 |
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost |  | 1,860,443 |
Held-to-maturity Securities, Amortized cost | [2] | 2,264,283 | 1,370,300
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 |  | 55,824 |
Availably-for-sale Securities, debt maturities, after ten years, Fair Value |  | 323,762 |
Held-to-maturity Securities, debt maturities, after five year through ten, Amortized Cost |  | 143,715 |
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost |  | 1,191,118 |
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 five through ten years, fair value | [1] | 338 |
Availably-for-sale Securities, debt maturities, after ten years, Fair Value | [1] | 305,192 |
Available-for-sale Securities, debt maturities, Fair Value | [1] | 305,530 |
Held-to-maturity Securities, debt maturities, after five year through ten, Amortized Cost |  | 143,715 |
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost |  | 1,191,118 |
Held-to-maturity Securities, Amortized cost | [2] | 1,334,833 | 1,567,758
Mortgage Backed Securities [Member] | Commercial [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] | 55,486 |
Availably-for-sale Securities, debt maturities, after ten years, Fair Value | [1] | 17,002 |
Available-for-sale Securities, debt maturities, Fair Value | [1] | 72,488 |
Held-to-maturity Securities, debt maturities, after one year through five, Amortized Cost |  | 58,971 |
Held-to-maturity Securities, Amortized cost | [2] | 58,971 | 59,581
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] | 1,568 |
Available-for-sale Securities, debt maturities, Fair Value | [1] | $ 1,568 |
Held-to-maturity Securities, Amortized cost | [2] |  | $ 688
[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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- Definition Fair value of available-for-sale debt securities maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62586-112803 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27198-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition Fair value of available-for-sale debt securities maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62586-112803 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27198-111563 + Details
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