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Available-For-Sale And Held-To-Maturity Securities (Contractual Maturities) (Details) - USD ($)
$ in Thousands
Dec. 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 $ 36,899 [1] $ 144,362
Available-for-sale Securities, debt maturities, after one year through five, Fair Value [1] 419,322  
Available-for-sale Securities, debt maturities, after five year through ten years, fair value 455,848 [1] 435,111
Availably-for-sale Securities, debt maturities, after ten years, Fair Value 1,201,824 [1] 1,247,060
Available-for-sale Securities, debt maturities, Fair Value 2,113,893 [1] 2,230,297
Held-to-maturity Securities, debt maturities, after one year through five, Amortized Cost 2,825  
Held-to-maturity Securities, debt maturities, after five year through ten, Amortized Cost 2,282,162 1,932,439
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost 3,063,571 2,167,485
Held-to-maturity Securities, Amortized cost 5,348,558 [2] 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] 1,808  
Available-for-sale Securities, debt maturities, Fair Value 1,808 [1] 4,361
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 year through ten years, fair value [1] 2,399  
Available-for-sale Securities, debt maturities, Fair Value 2,399 [1] 2,453
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] 35,033  
Available-for-sale Securities, debt maturities, after one year through five, Fair Value [1] 419,220  
Available-for-sale Securities, debt maturities, after five year through ten years, fair value [1] 337,640  
Available-for-sale Securities, debt maturities, Fair Value 791,893 [1] 631,758
Asset-Backed Securities [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Available-for-sale Securities, debt maturities, after five year through ten years, fair value [1] 58,078  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value [1] 232,976  
Available-for-sale Securities, debt maturities, Fair Value 291,054 [1] 698,133
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] 58  
Available-for-sale Securities, debt maturities, after one year through five, Fair Value [1] 102  
Available-for-sale Securities, debt maturities, after five year through ten years, fair value [1] 57,163  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value [1] 894,863  
Available-for-sale Securities, debt maturities, Fair Value 952,186 [1] 793,410
Agency Mortgage-Backed Securities [Member] | Commercial [Member]    
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]    
Availably-for-sale Securities, debt maturities, after ten years, Fair Value [1] 73,985  
Available-for-sale Securities, debt maturities, Fair Value 73,985 [1] 95,613
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, after five year through ten years, fair value [1] 568  
Available-for-sale Securities, debt maturities, Fair Value $ 568 [1] $ 4,569
[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.