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Available-for-Sale and Held-to-Maturity Securities (Contractual Maturities) (Details) - USD ($)
$ in Thousands
Mar. 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 $ 18,356 [1] $ 36,899
Available-for-sale Securities, debt maturities, after one year through five, Fair Value [1] 413,531  
Available-for-sale Securities, debt maturities, after five year through ten years, fair value 413,995 [1] 455,848
Availably-for-sale Securities, debt maturities, after ten years, Fair Value 1,080,262 [1] 1,201,824
Available-for-sale Securities, debt maturities, Fair Value 1,926,144 [1] 2,113,893
Held-to-maturity Securities, debt maturities, after five year through ten, Amortized Cost 2,217,675 2,282,162
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost 3,098,621 3,063,571
Held-to-maturity Securities, Amortized cost [2] 5,316,296 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] 1,102  
Available-for-sale Securities, debt maturities, after five year through ten years, fair value [1] 1,820  
Available-for-sale Securities, debt maturities, Fair Value 2,922 [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, after five year through ten years, fair value [1] 2,366  
Available-for-sale Securities, debt maturities, Fair Value 2,366 [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] 17,220  
Available-for-sale Securities, debt maturities, after one year through five, Fair Value [1] 413,376  
Available-for-sale Securities, debt maturities, after five year through ten years, fair value [1] 300,278  
Available-for-sale Securities, debt maturities, Fair Value 730,874 [1] 791,893
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] 34  
Available-for-sale Securities, debt maturities, after one year through five, Fair Value [1] 155  
Available-for-sale Securities, debt maturities, after five year through ten years, fair value [1] 51,139  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value [1] 802,618  
Available-for-sale Securities, debt maturities, Fair Value 853,946 [1] 952,186
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] 69,852  
Available-for-sale Securities, debt maturities, Fair Value 69,852 [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, after five year through ten years, fair value [1] 504  
Available-for-sale Securities, debt maturities, Fair Value 504 [1] 568
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] 57,888  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value [1] 207,792  
Available-for-sale Securities, debt maturities, Fair Value 265,680 [1] $ 291,054
Held-to-maturity Securities, debt maturities, after five year through ten, Amortized Cost 2,217,675  
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost 3,098,621  
Held-to-maturity Securities, Amortized cost $ 5,316,296  
[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.