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Available-for-Sale and Held-to-Maturity Securities (Schedule of Contractual Maturities) (Details) - USD ($)
$ in Thousands
Sep. 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 $ 85,380 [1] $ 15,877
Available-for-sale Securities, debt maturities, after one year through five, Fair Value [1] 223,749  
Available-for-sale Securities, debt maturities, after five through ten years, fair value 386,538 [1] 380,362
Availably-for-sale Securities, debt maturities, after ten years, Fair Value 816,566 [1] 952,319
Available-for-sale Securities, debt maturities, Fair Value 1,512,233 [1] 1,636,041
Held-to-maturity Securities, debt maturities, after five year through ten, Amortized Cost 2,765,980 2,413,239
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost 3,134,399 3,577,212
Held-to-maturity Securities, Amortized cost [2] 5,900,379 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] 2,135  
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 2,135 [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] 2,294  
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 2,294 [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] 85,380  
Available-for-sale Securities, debt maturities, after one year through five, Fair Value [1] 219,025  
Available-for-sale Securities, debt maturities, after five through ten years, fair value [1] 233,445  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value [1] 0  
Available-for-sale Securities, debt maturities, Fair Value 537,850 [1] 566,294
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] 295  
Available-for-sale Securities, debt maturities, after five through ten years, fair value [1] 92,085  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value [1] 622,870  
Available-for-sale Securities, debt maturities, Fair Value 715,250 [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 through ten years, fair value [1] 0  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value [1] 65,695  
Available-for-sale Securities, debt maturities, Fair Value 65,695 [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 through ten years, fair value [1] 332  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value [1] 0  
Available-for-sale Securities, debt maturities, Fair Value 332 [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] 60,676  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value [1] 128,001  
Available-for-sale Securities, debt maturities, Fair Value 188,677 [1] $ 207,725
Held-to-maturity Securities, debt maturities, after five year through ten, Amortized Cost 2,765,980  
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost 3,134,399  
Held-to-maturity Securities, Amortized cost $ 5,900,379  
[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.