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Available-for-Sale and Held-to-Maturity Securities (Schedule of Contractual Maturities) (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, debt maturities, within one year, Fair Value $ 104,113 [1] $ 15,877
Available-for-sale Securities, debt maturities, after one year through five, Fair Value [1] 209,143  
Available-for-sale Securities, debt maturities, after five year through ten years, fair value 398,624 [1] 380,362
Availably-for-sale Securities, debt maturities, after ten years, Fair Value 839,806 [1] 952,319
Available-for-sale Securities, debt maturities, Fair Value 1,551,686 [1] 1,636,041
Held-to-maturity Securities, debt maturities, after five year through ten, Amortized Cost 2,754,817 2,413,239
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost 3,133,981 3,577,212
Held-to-maturity Securities, Amortized cost [2] 5,888,798 5,990,451
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] 2,219  
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 2,219 [1] 2,148
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] 2,351  
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 2,351 [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] 104,113  
Available-for-sale Securities, debt maturities, after one year through five, Fair Value [1] 204,287  
Available-for-sale Securities, debt maturities, after five year through ten years, fair value [1] 247,761  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value [1] 0  
Available-for-sale Securities, debt maturities, Fair Value 556,161 [1] 566,294
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] 58,029  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value [1] 119,824  
Available-for-sale Securities, debt maturities, Fair Value 177,853 [1] 207,725
Held-to-maturity Securities, debt maturities, after five year through ten, Amortized Cost 2,754,817  
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost 3,133,981  
Held-to-maturity Securities, Amortized cost 5,888,798  
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] 286  
Available-for-sale Securities, debt maturities, after five year through ten years, fair value [1] 92,573  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value [1] 653,311  
Available-for-sale Securities, debt maturities, Fair Value 746,170 [1] 791,022
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] 66,671  
Available-for-sale Securities, debt maturities, Fair Value 66,671 [1] 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, 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] 261  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value [1] 0  
Available-for-sale Securities, debt maturities, Fair Value $ 261 [1] $ 388
[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.