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Available-For-Sale And Held-To-Maturity Securities (Contractual Maturities) (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale Securities, debt maturities, within one year, Fair Value $ 134,463 [1] $ 144,362
Available-for-sale Securities, debt maturities, after one year through five, Fair Value [1] 379,599  
Available-for-sale Securities, debt maturities, after five through ten years, fair value 350,871 [1] 435,111
Availably-for-sale Securities, debt maturities, after ten years, Fair Value 1,325,195 [1] 1,247,060
Available-for-sale Securities, debt maturities, Fair Value 2,190,128 [1] 2,230,297
Held-to-maturity Securities, debt maturities, after five year through ten, Amortized Cost 2,157,703 1,932,439
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost 2,602,075 2,167,485
Held-to-maturity Securities, Amortized cost 4,761,401 $ 4,117,384
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] 2,522  
Available-for-sale Securities, debt maturities, after one year through five, Fair Value [1] 1,123  
Available-for-sale Securities, debt maturities, Fair Value [1] 3,645  
State And Municipal Securities [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale Securities, debt maturities, after five through ten years, fair value [1] 2,428  
Available-for-sale Securities, debt maturities, Fair Value [1] 2,428  
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] 118,544  
Available-for-sale Securities, debt maturities, after one year through five, Fair Value [1] 378,194  
Available-for-sale Securities, debt maturities, after five through ten years, fair value [1] 214,821  
Available-for-sale Securities, debt maturities, Fair Value [1] 711,559  
Asset-Backed Securities [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale Securities, debt maturities, after five through ten years, fair value [1] 55,409  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value [1] 322,299  
Available-for-sale Securities, debt maturities, Fair Value [1] 377,708  
Held-to-maturity Securities, debt maturities, after one year through five, Amortized Cost 1,623  
Held-to-maturity Securities, debt maturities, after five year through ten, Amortized Cost 2,157,703  
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost 2,602,075  
Held-to-maturity Securities, Amortized cost 4,761,401  
Agency Mortgage-Backed Securities [Member] | Agency Securities    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale Securities, debt maturities, within one year, Fair Value [1] 11  
Available-for-sale Securities, debt maturities, after one year through five, Fair Value [1] 272  
Available-for-sale Securities, debt maturities, after five through ten years, fair value [1] 78,213  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value [1] 925,195  
Available-for-sale Securities, debt maturities, Fair Value [1] 1,003,691  
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],[2] 10,416  
Available-for-sale Securities, debt maturities, after one year through five, Fair Value [1],[2] 10  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value [1],[2] 77,013  
Available-for-sale Securities, debt maturities, Fair Value [1],[2] 87,439  
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] 2,970  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value [1] 688  
Available-for-sale Securities, debt maturities, Fair Value [1] $ 3,658  
[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.