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Available-For-Sale And Held-To-Maturity Securities (Schedule Of Amortized Cost And Fair Values Of Available-For-Sale Securities And Held-To-Maturity Securities By Contractual Maturity) (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Schedule Of Debt Securities At Amortized Cost And Fair Value Basis [Line Items]    
Available-for-sale Securities, debt maturities, Amortized Cost $ 3,024,611  
Available-for-sale Securities, debt maturities, within one year, Fair Value [1] 2,508  
Available-for-sale Securities, debt maturities, after five through ten years, fair value [1] 562,621  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value [1] 1,790,223  
Available-for-sale Securities, debt maturities, Fair Value [1] 3,003,767  
Held-to-maturity Securities, debt maturities, after five through ten years, Amortized Cost 636,128  
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost 3,418,765  
Held-to-maturity Securities, Amortized cost [2] 4,103,562 $ 4,218,854
Held-to-maturity Securities, debt maturities, Fair Value [2] 4,056,845 $ 4,122,907
Excluding Mortgage Backed Securities [Member]    
Schedule Of Debt Securities At Amortized Cost And Fair Value Basis [Line Items]    
Available-for-sale Securities, debt maturities, within one year, Amortized Cost 2,520  
Available-for-sale Securities, debt maturities, after one year through three years, Amortized Cost 268,305  
Available-for-sale Securities, debt maturities, after three year through five years, Amortized Cost 382,387  
Available-for-sale Securities, debt maturities, after five through ten years, Amortized Cost 556,764  
Availably-for-sale Securities, debt maturities, after ten years, Amortized Cost 1,522,383  
Available-for-sale Securities, debt maturities, within one year, Fair Value 2,508  
Available-for-sale Securities, debt maturities, after one year through three years, Fair Value 265,943  
Available-for-sale Securities, debt maturities, after three year through five years, Fair Value 381,155  
Available-for-sale Securities, debt maturities, after five through ten years, fair value 557,014  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value 1,509,205  
Held-to-maturity Securities, debt maturities, after five through ten years, Amortized Cost 475,640  
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost 2,422,088  
Held-to-maturity Securities, debt maturities, after five through ten years, Fair Value 474,910  
Held-to-maturity Securities, debt maturities, after ten years, Fair Value 2,387,270  
Mortgage Backed Securities [Member]    
Schedule Of Debt Securities At Amortized Cost And Fair Value Basis [Line Items]    
Available-for-sale Securities, debt maturities, after one year through three years, Amortized Cost 195  
Available-for-sale Securities, debt maturities, after three year through five years, Amortized Cost 1,106  
Available-for-sale Securities, debt maturities, after five through ten years, Amortized Cost 5,492  
Availably-for-sale Securities, debt maturities, after ten years, Amortized Cost 285,459  
Available-for-sale Securities, debt maturities, after one year through three years, Fair Value 198  
Available-for-sale Securities, debt maturities, after three year through five years, Fair Value 1,119  
Available-for-sale Securities, debt maturities, after five through ten years, fair value 5,607  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value 281,018  
Held-to-maturity Securities, debt maturities, after one year through three years, Amortized Cost 48,669  
Held-to-maturity Securities, debt maturities, after five through ten years, Amortized Cost 160,488  
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost 996,677  
Held-to-maturity Securities, debt maturities, after one year through three years, Fair Value 49,005  
Held-to-maturity Securities, debt maturities, after five through ten years, Fair Value 159,315  
Held-to-maturity Securities, debt maturities, after ten years, Fair Value $ 986,345  
[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.