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Available-for-Sale and Held-to-Maturity Securities (Schedule of Amortized Cost and Fair Values of Available for Sale Securities and Held to Maturity Securities) (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
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Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |  |  |  |
Available-for-sale Securities, Amortized Cost |  | $ 1,687,144 |  | $ 1,727,630 |
Available for sale securities, Gross Unrealized Gains | [1] | 70 |  | 6 |
Available-for-sale Securities, Gross unrealized losses | [1] | (187,232) |  | (175,950) |
Available-for-sale securities, Fair Value |  | 1,499,982 | [2] | 1,551,686 |
Held-to-maturity securities, at amortized cost | [3] | 5,793,750 |  | 5,888,798 |
Held-to-maturity Securities, Gross unrealized gains | [3] | 10,699 |  | 6,387 | [1]
Held-to-maturity Securities, Gross unrealized losses | [3] | (11,503) |  | (43,009) | [1]
Held-to-maturity securities, Estimated fair value |  | 5,792,946 |  | 5,852,176 | [3]
U.S. Government Agency Securities [Member] |  |  |  |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |  |  |  |
Available-for-sale Securities, Amortized Cost |  | 2,384 |  | 2,376 |
Available for sale securities, Gross Unrealized Gains | [1] | 0 |  | 5 |
Available-for-sale Securities, Gross unrealized losses | [1] | (175) |  | (162) |
Available-for-sale securities, Fair Value |  | 2,209 |  | 2,219 |
State And Municipal Securities [Member] |  |  |  |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |  |  |  |
Available-for-sale Securities, Amortized Cost |  | 2,350 |  | 2,350 |
Available for sale securities, Gross Unrealized Gains | [1] | 0 |  | 1 |
Available-for-sale Securities, Gross unrealized losses | [1] | 0 |  | 0 |
Available-for-sale securities, Fair Value |  | 2,350 |  | 2,351 |
Agency Mortgage-Backed Securities [Member] | Agency Securities [Member] |  |  |  |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |  |  |  |
Available-for-sale Securities, Amortized Cost |  | 837,331 |  | 855,456 |
Available for sale securities, Gross Unrealized Gains | [1] | 1 |  | 0 |
Available-for-sale Securities, Gross unrealized losses | [1] | (123,393) |  | (109,286) |
Available-for-sale securities, Fair Value |  | 713,939 | [2] | 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, Amortized Cost |  | 70,106 |  | 70,326 |
Available for sale securities, Gross Unrealized Gains | [1] | 0 |  | 0 |
Available-for-sale Securities, Gross unrealized losses | [1] | (3,252) |  | (3,655) |
Available-for-sale securities, Fair Value |  | 66,854 | [2] | 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, Amortized Cost |  | 259 |  | 274 |
Available for sale securities, Gross Unrealized Gains | [1] | 0 |  | 0 |
Available-for-sale Securities, Gross unrealized losses | [1] | (11) |  | (13) |
Available-for-sale securities, Fair Value |  | 248 | [2] | 261 |
Corporate Fixed Income Securities [Member] |  |  |  |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |  |  |  |
Available-for-sale Securities, Amortized Cost |  | 600,776 |  | 615,131 |
Available for sale securities, Gross Unrealized Gains | [1] | 0 |  | 0 |
Available-for-sale Securities, Gross unrealized losses | [1] | (57,779) |  | (58,970) |
Available-for-sale securities, Fair Value |  | 542,997 |  | 556,161 |
Asset-Backed Securities [Member] |  |  |  |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |  |  |  |
Available-for-sale Securities, Amortized Cost |  | 173,938 |  | 181,717 |
Available for sale securities, Gross Unrealized Gains | [1] | 69 |  | 0 |
Available-for-sale Securities, Gross unrealized losses | [1] | (2,622) |  | (3,864) |
Available-for-sale securities, Fair Value |  | 171,385 | [2] | $ 177,853 |
Held-to-maturity securities, at amortized cost | [2] | $ 5,793,750 |  |  |
[1] | Unrealized gains/(losses) related to available-for-sale securities are reported in accumulated other comprehensive income.
[2] | Due to the immaterial amount of income recognized on tax-exempt securities, yields were not calculated on a tax-equivalent basis.
[3] | 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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