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Available-For-Sale And Held-To-Maturity Securities (Contractual Maturities) (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
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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 |  | $ 26,980 | [1] | $ 6,871
Available-for-sale Securities, debt maturities, after one year through five, Fair Value | [1] | 672,150 |  |
Available-for-sale Securities, debt maturities, after five through ten years, fair value |  | 453,334 | [1] | 411,680
Availably-for-sale Securities, debt maturities, after ten years, Fair Value |  | 2,213,626 | [1] | 2,176,517
Available-for-sale Securities, debt maturities, Fair Value |  | 3,366,090 | [1] | 3,254,737
Held-to-maturity Securities, debt maturities, after five year through ten, Amortized Cost |  | 686,300 |  | 598,250
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost |  | 2,399,524 |  | 2,257,969
Held-to-maturity Securities, Amortized cost |  | 3,085,824 |  | $ 2,856,219
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] | 1,761 |  |
Available-for-sale Securities, debt maturities, after one year through five, Fair Value | [1] | 3,889 |  |
Available-for-sale Securities, debt maturities, Fair Value | [1] | 5,650 |  |
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] | 2,463 |  |
Availably-for-sale Securities, debt maturities, after ten years, Fair Value | [1] | 14,679 |  |
Available-for-sale Securities, debt maturities, Fair Value | [1] | 17,142 |  |
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] | 25,186 |  |
Available-for-sale Securities, debt maturities, after one year through five, Fair Value | [1] | 628,151 |  |
Available-for-sale Securities, debt maturities, after five through ten years, fair value | [1] | 74,253 |  |
Available-for-sale Securities, debt maturities, Fair Value | [1] | 727,590 |  |
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] | 375,832 |  |
Availably-for-sale Securities, debt maturities, after ten years, Fair Value | [1] | 1,293,613 |  |
Available-for-sale Securities, debt maturities, Fair Value | [1] | 1,669,445 |  |
Held-to-maturity Securities, debt maturities, after five year through ten, Amortized Cost |  | 686,300 |  |
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost |  | 2,399,524 |  |
Held-to-maturity Securities, Amortized cost |  | 3,085,824 |  |
Mortgage Backed Securities [Member] | 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] | 33 |  |
Available-for-sale Securities, debt maturities, after one year through five, Fair Value | [1] | 676 |  |
Available-for-sale Securities, debt maturities, after five through ten years, fair value | [1] | 786 |  |
Availably-for-sale Securities, debt maturities, after ten years, Fair Value | [1] | 827,938 |  |
Available-for-sale Securities, debt maturities, Fair Value | [1] | 829,433 |  |
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 one year through five, Fair Value | [1] | 31,607 |  |
Availably-for-sale Securities, debt maturities, after ten years, Fair Value | [1] | 76,579 |  |
Available-for-sale Securities, debt maturities, Fair Value | [1] | 108,186 |  |
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, after one year through five, Fair Value | [1] | 7,827 |  |
Availably-for-sale Securities, debt maturities, after ten years, Fair Value | [1] | 817 |  |
Available-for-sale Securities, debt maturities, Fair Value | [1] | $ 8,644 |  |
[1] | Due to the immaterial amount of income recognized on tax-exempt securities, yields were not calculated on a tax-equivalent basis.

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