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Available-For-Sale And Held-To-Maturity Securities (Contractual Maturities) (Details) - USD ($)
$ in Thousands
Jun. 30, 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 $ 55,602 [1] $ 15,877
Available-for-sale Securities, debt maturities, after one year through five, Fair Value [1] 255,254  
Available-for-sale Securities, debt maturities, after five through ten years, fair value 393,435 [1] 380,362
Availably-for-sale Securities, debt maturities, after ten years, Fair Value 878,127 [1] 952,319
Available-for-sale Securities, debt maturities, Fair Value 1,582,418 1,636,041
Held-to-maturity Securities, debt maturities, after five year through ten, Amortized Cost 2,788,861 2,413,239
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost 3,162,621 3,577,212
Held-to-maturity Securities, Amortized cost [2] 5,951,482 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] 2,163  
Available-for-sale Securities, debt maturities, after five 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 2,163 [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] 2,350  
Available-for-sale Securities, debt maturities, after five 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 2,350 [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] 55,601  
Available-for-sale Securities, debt maturities, after one year through five, Fair Value [1] 250,417  
Available-for-sale Securities, debt maturities, after five through ten years, fair value [1] 239,946  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value [1] 0  
Available-for-sale Securities, debt maturities, Fair Value 545,964 [1] 566,294
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] 1  
Available-for-sale Securities, debt maturities, after one year through five, Fair Value [1] 324  
Available-for-sale Securities, debt maturities, after five through ten years, fair value [1] 91,851  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value [1] 676,372  
Available-for-sale Securities, debt maturities, Fair Value 768,548 [1] 791,022
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 through ten years, fair value [1] 0  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value [1] 65,578  
Available-for-sale Securities, debt maturities, Fair Value 65,578 [1] 66,113
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 through ten years, fair value [1] 343  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value [1] 0  
Available-for-sale Securities, debt maturities, Fair Value 343 [1] 388
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 through ten years, fair value [1] 61,295  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value [1] 136,177  
Available-for-sale Securities, debt maturities, Fair Value 197,472 [1] $ 207,725
Held-to-maturity Securities, debt maturities, after five year through ten, Amortized Cost 2,788,861  
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost 3,162,621  
Held-to-maturity Securities, Amortized cost $ 5,951,482  
[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.