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Available-For-Sale And Held-To-Maturity Securities (Contractual Maturities) (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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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 |  | $ 134,463 | [1] | $ 144,362
Available-for-sale Securities, debt maturities, after one year through five, Fair Value | [1] | 379,599 |  |
Available-for-sale Securities, debt maturities, after five through ten years, fair value |  | 350,871 | [1] | 435,111
Availably-for-sale Securities, debt maturities, after ten years, Fair Value |  | 1,325,195 | [1] | 1,247,060
Available-for-sale Securities, debt maturities, Fair Value |  | 2,190,128 | [1] | 2,230,297
Held-to-maturity Securities, debt maturities, after five year through ten, Amortized Cost |  | 2,157,703 |  | 1,932,439
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost |  | 2,602,075 |  | 2,167,485
Held-to-maturity Securities, Amortized cost |  | 4,761,401 |  | $ 4,117,384
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] | 2,522 |  |
Available-for-sale Securities, debt maturities, after one year through five, Fair Value | [1] | 1,123 |  |
Available-for-sale Securities, debt maturities, Fair Value | [1] | 3,645 |  |
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] | 2,428 |  |
Available-for-sale Securities, debt maturities, Fair Value | [1] | 2,428 |  |
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] | 118,544 |  |
Available-for-sale Securities, debt maturities, after one year through five, Fair Value | [1] | 378,194 |  |
Available-for-sale Securities, debt maturities, after five through ten years, fair value | [1] | 214,821 |  |
Available-for-sale Securities, debt maturities, Fair Value | [1] | 711,559 |  |
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] | 55,409 |  |
Availably-for-sale Securities, debt maturities, after ten years, Fair Value | [1] | 322,299 |  |
Available-for-sale Securities, debt maturities, Fair Value | [1] | 377,708 |  |
Held-to-maturity Securities, debt maturities, after one year through five, Amortized Cost |  | 1,623 |  |
Held-to-maturity Securities, debt maturities, after five year through ten, Amortized Cost |  | 2,157,703 |  |
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost |  | 2,602,075 |  |
Held-to-maturity Securities, Amortized cost |  | 4,761,401 |  |
Agency Mortgage-Backed Securities [Member] | Agency Securities |  |  |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |  |  |
Available-for-sale Securities, debt maturities, within one year, Fair Value | [1] | 11 |  |
Available-for-sale Securities, debt maturities, after one year through five, Fair Value | [1] | 272 |  |
Available-for-sale Securities, debt maturities, after five through ten years, fair value | [1] | 78,213 |  |
Availably-for-sale Securities, debt maturities, after ten years, Fair Value | [1] | 925,195 |  |
Available-for-sale Securities, debt maturities, Fair Value | [1] | 1,003,691 |  |
Agency Mortgage-Backed Securities [Member] | Commercial [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],[2] | 10,416 |  |
Available-for-sale Securities, debt maturities, after one year through five, Fair Value | [1],[2] | 10 |  |
Availably-for-sale Securities, debt maturities, after ten years, Fair Value | [1],[2] | 77,013 |  |
Available-for-sale Securities, debt maturities, Fair Value | [1],[2] | 87,439 |  |
Agency Mortgage-Backed Securities [Member] | Non-Agency [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] | 2,970 |  |
Availably-for-sale Securities, debt maturities, after ten years, Fair Value | [1] | 688 |  |
Available-for-sale Securities, debt maturities, Fair Value | [1] | $ 3,658 |  |
[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 investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in sixth through tenth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27198-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3A -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=120252992&loc=SL120269850-112803 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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- Definition Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing after tenth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120252992&loc=SL120269850-112803 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27198-111563 + Details
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