Quarterly report pursuant to Section 13 or 15(d)

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

v3.19.3
Available-for-Sale Securities, Weighted Average Life Classifications (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]    
Less than or equal to 1 year $ 43,599  
Greater than 1 year and less than or equal to 3 years 239,782  
Greater than 3 years and less than or equal to 5 years 4,995,256  
Greater than 5 years and less than or equal to 10 years 22,665,975  
Greater than 10 years 373,946  
Available-for-sale securities, at fair value 28,318,558 $ 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 666  
Greater than 1 year and less than or equal to 3 years 59,293  
Greater than 3 years and less than or equal to 5 years 4,800,249  
Greater than 5 years and less than or equal to 10 years 19,904,761  
Greater than 10 years 1,214  
Available-for-sale securities, at fair value 24,766,183 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 42,933  
Greater than 1 year and less than or equal to 3 years 180,489  
Greater than 3 years and less than or equal to 5 years 195,007  
Greater than 5 years and less than or equal to 10 years 2,761,214  
Greater than 10 years 372,732  
Available-for-sale securities, at fair value $ 3,552,375 $ 3,867,571