Quarterly report pursuant to Section 13 or 15(d)

Schedule of Available-for-sale Securities Reconciliation (Details)

v3.20.2
Schedule of Available-for-sale Securities Reconciliation (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Jun. 30, 2020
Jan. 01, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]        
Principal/Current Face $ 19,946,753     $ 38,696,494
Unamortized Premium 837,047     1,245,069
Accretable Purchase Discount 52     560,159
Credit Reserve Purchase Discount       1,711,951
Amortized Cost 15,879,431     30,711,157
Allowance for Credit Losses (25,495) $ (42,583) $ (244,876) 0
Unrealized Gain 734,677     783,164
Unrealized Loss 14,292     87,993
Available-for-sale securities, at fair value 16,574,321     31,406,328
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]        
Debt Securities, Available-for-sale [Line Items]        
Principal/Current Face 17,229,741     28,841,237
Unamortized Premium 814,634     1,156,154
Accretable Purchase Discount 14     19
Credit Reserve Purchase Discount       0
Amortized Cost 15,854,627     27,395,679
Allowance for Credit Losses (19,241) 30,634 0  
Unrealized Gain 734,474     438,542
Unrealized Loss 13,532     56,166
Available-for-sale securities, at fair value 16,556,328     27,778,055
Mortgage-backed Securities, Issued by Private Enterprises [Member]        
Debt Securities, Available-for-sale [Line Items]        
Principal/Current Face 2,717,012     9,855,257
Unamortized Premium 22,413     88,915
Accretable Purchase Discount 38     560,140
Credit Reserve Purchase Discount       1,711,951
Amortized Cost 24,804     3,315,478
Allowance for Credit Losses (6,254) $ 11,949 $ 244,876  
Unrealized Gain 203     344,622
Unrealized Loss 760     31,827
Available-for-sale securities, at fair value 17,993     3,628,273
Interest-Only-Strip [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]        
Debt Securities, Available-for-sale [Line Items]        
Principal/Current Face 2,189,734     2,601,693
Unamortized Premium 126,068     169,811
Accretable Purchase Discount 0     0
Credit Reserve Purchase Discount       0
Amortized Cost 126,068     169,811
Allowance for Credit Losses (19,241)      
Unrealized Gain 12,298     13,724
Unrealized Loss 13,183     47,351
Available-for-sale securities, at fair value 105,942     136,184
Interest-Only-Strip [Member] | Mortgage-backed Securities, Issued by Private Enterprises [Member]        
Debt Securities, Available-for-sale [Line Items]        
Principal/Current Face 2,714,583     4,356,603
Unamortized Premium 22,406     79,935
Accretable Purchase Discount 0     0
Credit Reserve Purchase Discount       0
Amortized Cost 22,406     79,935
Allowance for Credit Losses (6,254)      
Unrealized Gain 62     3,039
Unrealized Loss 760     8,564
Available-for-sale securities, at fair value 15,454     74,410
Fixed Income Securities [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]        
Debt Securities, Available-for-sale [Line Items]        
Principal/Current Face 15,040,007     26,239,544
Unamortized Premium 688,566     986,343
Accretable Purchase Discount 14     19
Credit Reserve Purchase Discount       0
Amortized Cost 15,728,559     27,225,868
Allowance for Credit Losses 0      
Unrealized Gain 722,176     424,818
Unrealized Loss 349     8,815
Available-for-sale securities, at fair value 16,450,386     27,641,871
Fixed Income Securities [Member] | Mortgage-backed Securities, Issued by Private Enterprises [Member]        
Debt Securities, Available-for-sale [Line Items]        
Principal/Current Face 2,429     5,498,654
Unamortized Premium 7     8,980
Accretable Purchase Discount 38     560,140
Credit Reserve Purchase Discount       1,711,951
Amortized Cost 2,398     3,235,543
Allowance for Credit Losses 0      
Unrealized Gain 141     341,583
Unrealized Loss 0     23,263
Available-for-sale securities, at fair value $ 2,539     $ 3,553,863