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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
Dec. 31, 2023
Dec. 31, 2022
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale Securities, Amortized Cost $ 1,727,630 $ 1,863,219
Available for sale securities, Gross Unrealized Gains [1] 6 151
Available-for-sale Securities, Gross Unrealized Losses [1] (175,950) (227,329)
Available-for-sale securities, Fair Value 1,551,686 [2] 1,636,041
Held-to-maturity Securities, Amortized cost [3] 5,888,798 5,990,451
Held-to-maturity Securities, Gross unrealized gains [1],[3] 6,387 3,213
Held-to-maturity Securities, Gross unrealized losses [1],[3] (43,009) (255,246)
Held-to-maturity securities, Estimated Fair Value [3] 5,852,176 5,738,418
U.S. Government Agency Securities [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale Securities, Amortized Cost 2,376 2,345
Available for sale securities, Gross Unrealized Gains [1] 5 6
Available-for-sale Securities, Gross Unrealized Losses [1] (162) (203)
Available-for-sale securities, Fair Value 2,219 2,148
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] 1 1
Available-for-sale Securities, Gross Unrealized Losses [1] 0 0
Available-for-sale securities, Fair Value 2,351 2,351
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 855,456 921,676
Available for sale securities, Gross Unrealized Gains [1] 0 0
Available-for-sale Securities, Gross Unrealized Losses [1] (109,286) (130,654)
Available-for-sale securities, Fair Value 746,170 [2] 791,022
Mortgage-Backed Securities [Member] | Commercial [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale Securities, Amortized Cost 70,326 71,462
Available for sale securities, Gross Unrealized Gains [1] 0 0
Available-for-sale Securities, Gross Unrealized Losses [1] (3,655) (5,349)
Available-for-sale securities, Fair Value 66,671 [2] 66,113
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 274 442
Available for sale securities, Gross Unrealized Gains [1] 0 0
Available-for-sale Securities, Gross Unrealized Losses [1] (13) (54)
Available-for-sale securities, Fair Value 261 [2] 388
Corporate Fixed Income Securities [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale Securities, Amortized Cost 615,131 643,379
Available for sale securities, Gross Unrealized Gains [1] 0 18
Available-for-sale Securities, Gross Unrealized Losses [1] (58,970) (77,103)
Available-for-sale securities, Fair Value 556,161 566,294
Asset-Backed Securities [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale Securities, Amortized Cost 181,717 221,565
Available for sale securities, Gross Unrealized Gains [1] 0 126
Available-for-sale Securities, Gross Unrealized Losses [1] (3,864) (13,966)
Available-for-sale securities, Fair Value 177,853 [2] $ 207,725
Held-to-maturity Securities, Amortized cost $ 5,888,798  
[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.