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Available-For-Sale And Held-To-Maturity Securities (Contractual Maturities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale Securities, debt maturities, within one year, Fair Value $ 15,877 [1] $ 36,899
Available-for-sale Securities, debt maturities, after one year through five, Fair Value [1] 287,483  
Available-for-sale Securities, debt maturities, after five year through ten years, fair value 380,362 [1] 455,848
Availably-for-sale Securities, debt maturities, after ten years, Fair Value 952,319 [1] 1,201,824
Available-for-sale Securities, debt maturities, Fair Value 1,636,041 [1] 2,113,893
Held-to-maturity Securities, debt maturities, after five year through ten, Amortized Cost 2,413,239 2,282,162
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost 3,577,212 3,063,571
Held-to-maturity Securities, Amortized cost [2] 5,990,451 5,348,558
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] 2,148  
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 2,148 [1] 1,808
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 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] 2,399
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] 15,865  
Available-for-sale Securities, debt maturities, after one year through five, Fair Value [1] 282,913  
Available-for-sale Securities, debt maturities, after five year through ten years, fair value [1] 267,516  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value [1] 0  
Available-for-sale Securities, debt maturities, Fair Value 566,294 [1] 791,893
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] 64,240  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value [1] 143,485  
Available-for-sale Securities, debt maturities, Fair Value 207,725 [1] 291,054
Held-to-maturity Securities, debt maturities, after five year through ten, Amortized Cost 2,413,239  
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost 3,577,212  
Held-to-maturity Securities, Amortized cost 5,990,451  
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] 12  
Available-for-sale Securities, debt maturities, after one year through five, Fair Value [1] 71  
Available-for-sale Securities, debt maturities, after five year through ten years, fair value [1] 48,218  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value [1] 742,721  
Available-for-sale Securities, debt maturities, Fair Value 791,022 [1] 952,186
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] 66,113  
Available-for-sale Securities, debt maturities, Fair Value 66,113 [1] 73,985
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] 388  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value [1] 0  
Available-for-sale Securities, debt maturities, Fair Value $ 388 [1] $ 568
[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.