Annual report pursuant to Section 13 and 15(d)

Available-for-Sale Securities, Weighted Average Life Classifications (Details)

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Available-for-Sale Securities, Weighted Average Life Classifications (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]    
Less than or equal to 1 year $ 41,572  
Greater than 1 year and less than or equal to 3 years 248,658  
Greater than 3 years and less than or equal to 5 years 3,283,081  
Greater than 5 years and less than or equal to 10 years 27,138,336  
Greater than 10 years 694,681  
Available-for-sale securities, at fair value 31,406,328 $ 25,552,604
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Debt Securities, Available-for-sale [Line Items]    
Less than or equal to 1 year 380  
Greater than 1 year and less than or equal to 3 years 57,403  
Greater than 3 years and less than or equal to 5 years 3,071,314  
Greater than 5 years and less than or equal to 10 years 24,357,478  
Greater than 10 years 291,480  
Available-for-sale securities, at fair value 27,778,055 21,685,033
Mortgage-backed Securities, Issued by Private Enterprises [Member]    
Debt Securities, Available-for-sale [Line Items]    
Less than or equal to 1 year 41,192  
Greater than 1 year and less than or equal to 3 years 191,255  
Greater than 3 years and less than or equal to 5 years 211,767  
Greater than 5 years and less than or equal to 10 years 2,780,858  
Greater than 10 years 403,201  
Available-for-sale securities, at fair value $ 3,628,273 $ 3,867,571