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Available-For-Sale And Held-To-Maturity Securities (Schedule Of Amortized Cost And Fair Values Of Debt Securities By Contractual Maturity) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Schedule Of Debt Securities At Amortized Cost And Fair Value Basis [Line Items]    
Available-for-sale Securities, debt maturities, Amortized Cost $ 3,393,128  
Available-for-sale Securities, debt maturities, within one year, Fair Value [1] 37,275  
Available-for-sale Securities, debt maturities, after five through ten years, fair value [1] 696,128  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value [1] 1,896,648  
Available-for-sale Securities, debt maturities, Fair Value [1] 3,349,607  
Held-to-maturity Securities, debt maturities, after five through ten years, Amortized Cost 658,457  
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost 3,851,645  
Held-to-maturity Securities, Amortized cost [2] 4,565,453 $ 3,698,098
Held-to-maturity Securities, debt maturities, Fair Value [2] 4,506,385 $ 3,710,478
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 37,338  
Available-for-sale Securities, debt maturities, after one year through three years, Amortized Cost 380,761  
Available-for-sale Securities, debt maturities, after three year through five years, Amortized Cost 351,855  
Available-for-sale Securities, debt maturities, after five through ten years, Amortized Cost 698,866  
Availably-for-sale Securities, debt maturities, after ten years, Amortized Cost 1,592,209  
Available-for-sale Securities, debt maturities, within one year, Fair Value 37,275  
Available-for-sale Securities, debt maturities, after one year through three years, Fair Value 372,133  
Available-for-sale Securities, debt maturities, after three year through five years, Fair Value 345,895  
Available-for-sale Securities, debt maturities, after five through ten years, fair value 689,934  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value 1,583,470  
Held-to-maturity Securities, debt maturities, after five through ten years, Amortized Cost 478,024  
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost 2,787,496  
Held-to-maturity Securities, debt maturities, after five through ten years, Fair Value 478,491  
Held-to-maturity Securities, debt maturities, after ten years, Fair Value 2,777,211  
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 163  
Available-for-sale Securities, debt maturities, after three year through five years, Amortized Cost 1,360  
Available-for-sale Securities, debt maturities, after five through ten years, Amortized Cost 6,242  
Availably-for-sale Securities, debt maturities, after ten years, Amortized Cost 324,334  
Available-for-sale Securities, debt maturities, after one year through three years, Fair Value 163  
Available-for-sale Securities, debt maturities, after three year through five years, Fair Value 1,365  
Available-for-sale Securities, debt maturities, after five through ten years, fair value 6,194  
Availably-for-sale Securities, debt maturities, after ten years, Fair Value 313,178  
Held-to-maturity Securities, debt maturities, after one year through three years, Amortized Cost 55,351  
Held-to-maturity Securities, debt maturities, after five through ten years, Amortized Cost 180,433  
Held-to-maturity Securities, debt maturities, after ten years, Amortized Cost 1,064,149  
Held-to-maturity Securities, debt maturities, after one year through three years, Fair Value 55,008  
Held-to-maturity Securities, debt maturities, after five through ten years, Fair Value 173,389  
Held-to-maturity Securities, debt maturities, after ten years, Fair Value $ 1,022,286  
[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.