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Available-For-Sale And Held-To-Maturity Securities (Contractual Maturities) (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
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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 |  | $ 96,116 | [1] | $ 104,113
Available-for-sale Securities, debt maturities, after one year through five, Fair Value | [1] | 168,376 |  |
Available-for-sale Securities, debt maturities, after five year through ten years, fair value |  | 377,250 | [1] | 398,624
Availably-for-sale Securities, debt maturities, after ten years, Fair Value |  | 941,735 | [1] | 839,806
Available-for-sale Securities, debt maturities, Fair Value |  | 1,583,477 | [1] | 1,551,686
Held-to-maturity Securities, debt maturities, after one year through five, Amortized Cost | [1] | 15,000 |  |
Held-to-maturity Securities, debt maturities, after five year through ten, Amortized Cost |  | 2,867,782 | [1] | 2,754,817
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost |  | 3,176,485 | [1] | 3,133,981
Held-to-maturity Securities, Amortized cost | [2] | 6,059,267 |  | 5,888,798
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] | 0 |  |
Available-for-sale Securities, debt maturities, after one year through five, Fair Value | [1] | 2,215 |  |
Available-for-sale Securities, debt maturities, after five year through ten years, fair value | [1] | 0 |  |
Availably-for-sale Securities, debt maturities, after ten years, Fair Value | [1] | 0 |  |
Available-for-sale Securities, debt maturities, Fair Value |  | 2,215 | [1] | 2,219
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] | 0 |  |
Available-for-sale Securities, debt maturities, after one year through five, Fair Value | [1] | 2,337 |  |
Available-for-sale Securities, debt maturities, after five year through ten years, fair value | [1] | 0 |  |
Availably-for-sale Securities, debt maturities, after ten years, Fair Value | [1] | 0 |  |
Available-for-sale Securities, debt maturities, Fair Value |  | 2,337 | [1] | 2,351
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] | 96,116 |  |
Available-for-sale Securities, debt maturities, after one year through five, Fair Value | [1] | 163,583 |  |
Available-for-sale Securities, debt maturities, after five year through ten years, fair value | [1] | 247,684 |  |
Availably-for-sale Securities, debt maturities, after ten years, Fair Value | [1] | 0 |  |
Available-for-sale Securities, debt maturities, Fair Value |  | 507,383 | [1] | 556,161
Agency Mortgage-Backed Securities [Member] | 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] | 0 |  |
Available-for-sale Securities, debt maturities, after one year through five, Fair Value | [1] | 241 |  |
Available-for-sale Securities, debt maturities, after five year through ten years, fair value | [1] | 81,553 |  |
Availably-for-sale Securities, debt maturities, after ten years, Fair Value | [1] | 763,668 |  |
Available-for-sale Securities, debt maturities, Fair Value |  | 845,462 | [1] | 746,170
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] | 0 |  |
Available-for-sale Securities, debt maturities, after one year through five, Fair Value | [1] | 0 |  |
Available-for-sale Securities, debt maturities, after five year through ten years, fair value | [1] | 0 |  |
Availably-for-sale Securities, debt maturities, after ten years, Fair Value | [1] | 66,830 |  |
Available-for-sale Securities, debt maturities, Fair Value |  | 66,830 | [1] | 66,671
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] | 0 |  |
Available-for-sale Securities, debt maturities, after one year through five, Fair Value | [1] | 0 |  |
Available-for-sale Securities, debt maturities, after five year through ten years, fair value | [1] | 222 |  |
Availably-for-sale Securities, debt maturities, after ten years, Fair Value | [1] | 0 |  |
Available-for-sale Securities, debt maturities, Fair Value |  | 222 | [1] | 261
Asset-Backed 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] | 0 |  |
Available-for-sale Securities, debt maturities, after one year through five, Fair Value | [1] | 0 |  |
Available-for-sale Securities, debt maturities, after five year through ten years, fair value | [1] | 47,791 |  |
Availably-for-sale Securities, debt maturities, after ten years, Fair Value | [1] | 111,237 |  |
Available-for-sale Securities, debt maturities, Fair Value |  | 159,028 | [1] | $ 177,853
Held-to-maturity Securities, Amortized cost | [1] | $ 6,059,267 |  |
[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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