Quarterly report pursuant to Section 13 or 15(d)

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

v3.20.1
Available-for-Sale Securities, Weighted Average Life Classifications (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]    
Less than or equal to 1 year $ 803  
Greater than 1 year and less than or equal to 3 years 61,183  
Greater than 3 years and less than or equal to 5 years 3,803,247  
Greater than 5 years and less than or equal to 10 years 13,866,700  
Greater than 10 years 1,126  
Available-for-sale securities, at fair value 17,733,059 $ 31,406,328
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Debt Securities, Available-for-sale [Line Items]    
Less than or equal to 1 year 718  
Greater than 1 year and less than or equal to 3 years 51,049  
Greater than 3 years and less than or equal to 5 years 3,793,934  
Greater than 5 years and less than or equal to 10 years 13,859,832  
Greater than 10 years 1,126  
Available-for-sale securities, at fair value 17,706,659 27,778,055
Mortgage-backed Securities, Issued by Private Enterprises [Member]    
Debt Securities, Available-for-sale [Line Items]    
Less than or equal to 1 year 85  
Greater than 1 year and less than or equal to 3 years 10,134  
Greater than 3 years and less than or equal to 5 years 9,313  
Greater than 5 years and less than or equal to 10 years 6,868  
Greater than 10 years 0  
Available-for-sale securities, at fair value $ 26,400 $ 3,628,273