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Available-For-Sale And Held-To-Maturity Securities (Contractual Maturities) (Details) - USD ($)
$ in Thousands
Sep. 30, 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 $ 25,321 [1] $ 144,362
Available-for-sale Securities, debt maturities, after one year through five, Fair Value [1] 452,875  
Available-for-sale Securities, debt maturities, after five through ten years, fair value 461,232 [1] 435,111
Availably-for-sale Securities, debt maturities, after ten years, Fair Value 1,303,037 [1] 1,247,060
Available-for-sale Securities, debt maturities, Fair Value 2,242,465 [1] 2,230,297
Held-to-maturity Securities, debt maturities, after five year through ten, Amortized Cost 2,267,811 1,932,439
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost 3,080,010 2,167,485
Held-to-maturity Securities, Amortized cost 5,347,821 $ 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] 2,064  
Available-for-sale Securities, debt maturities, after one year through five, Fair Value [1] 204  
Available-for-sale Securities, debt maturities, Fair Value [1] 2,268  
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] 2,414  
Available-for-sale Securities, debt maturities, Fair Value [1] 2,414  
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] 23,201  
Available-for-sale Securities, debt maturities, after one year through five, Fair Value [1] 452,575  
Available-for-sale Securities, debt maturities, after five through ten years, fair value [1] 345,063  
Available-for-sale Securities, debt maturities, Fair Value [1] 820,839  
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] 50,434  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value [1] 273,498  
Available-for-sale Securities, debt maturities, Fair Value [1] 323,932  
Held-to-maturity Securities, debt maturities, after five year through ten, Amortized Cost 2,267,811  
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost 3,080,010  
Held-to-maturity Securities, Amortized cost 5,347,821  
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] 56  
Available-for-sale Securities, debt maturities, after one year through five, Fair Value [1] 96  
Available-for-sale Securities, debt maturities, after five through ten years, fair value [1] 63,321  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value [1] 953,257  
Available-for-sale Securities, debt maturities, Fair Value [1] 1,016,730  
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],[2] 75,701  
Available-for-sale Securities, debt maturities, Fair Value [1],[2] 75,701  
Agency Mortgage-Backed Securities [Member] | Non-Agency [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] 581  
Available-for-sale Securities, debt maturities, Fair Value [1] $ 581  
[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.