Quarterly report pursuant to Section 13 or 15(d)

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

v3.19.2
Available-for-Sale Securities, Weighted Average Life Classifications (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]    
Less than or equal to 1 year $ 41,158  
Greater than 1 year and less than or equal to 3 years 305,593  
Greater than 3 years and less than or equal to 5 years 5,580,707  
Greater than 5 years and less than or equal to 10 years 23,796,300  
Greater than 10 years 462,321  
Available-for-sale securities, at fair value 30,186,079 $ 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 3,084  
Greater than 1 year and less than or equal to 3 years 60,936  
Greater than 3 years and less than or equal to 5 years 5,269,154  
Greater than 5 years and less than or equal to 10 years 20,974,109  
Greater than 10 years 1,160  
Available-for-sale securities, at fair value 26,308,443 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 38,074  
Greater than 1 year and less than or equal to 3 years 244,657  
Greater than 3 years and less than or equal to 5 years 311,553  
Greater than 5 years and less than or equal to 10 years 2,822,191  
Greater than 10 years 461,161  
Available-for-sale securities, at fair value $ 3,877,636 $ 3,867,571