Annual report pursuant to Section 13 and 15(d)

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

v3.20.4
Schedule of Available-for-sale Securities Reconciliation (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Jan. 01, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]      
Principal/Current Face $ 18,848,276   $ 38,696,494
Unamortized Premium 937,537   1,245,069
Debt Securities, Available-for-sale, Net, Unamortized (50)   (560,159)
Credit Reserve Purchase Discount     1,711,951
Amortized Cost 14,043,175 $ 30,700,000 30,711,157
Allowance for Credit Losses (22,528) (244,876) 0
Unrealized Gain 644,868   783,164
Debt Securities, Available-for-sale, Unrealized Losses (14,593)   (87,993)
Available-for-sale securities, at fair value 14,650,922   31,406,328
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]      
Debt Securities, Available-for-sale [Line Items]      
Principal/Current Face 16,752,911   28,841,237
Unamortized Premium 921,129   1,156,154
Debt Securities, Available-for-sale, Net, Unamortized (14)   (19)
Credit Reserve Purchase Discount     0
Amortized Cost 14,024,470   27,395,679
Allowance for Credit Losses (17,889) 0  
Unrealized Gain 644,759   438,542
Debt Securities, Available-for-sale, Unrealized Losses (13,449)   (56,166)
Available-for-sale securities, at fair value 14,637,891   27,778,055
Mortgage-backed Securities, Issued by Private Enterprises [Member]      
Debt Securities, Available-for-sale [Line Items]      
Principal/Current Face 2,095,365   9,855,257
Unamortized Premium 16,408   88,915
Debt Securities, Available-for-sale, Net, Unamortized (36)   (560,140)
Credit Reserve Purchase Discount     1,711,951
Amortized Cost 18,705   3,315,478
Allowance for Credit Losses (4,639) $ 244,876  
Unrealized Gain 109   344,622
Debt Securities, Available-for-sale, Unrealized Losses (1,144)   (31,827)
Available-for-sale securities, at fair value 13,031   3,628,273
Fixed Income Securities [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]      
Debt Securities, Available-for-sale [Line Items]      
Principal/Current Face 13,103,355   26,239,544
Unamortized Premium 605,253   986,343
Debt Securities, Available-for-sale, Net, Unamortized (14)   (19)
Credit Reserve Purchase Discount     0
Amortized Cost 13,708,594   27,225,868
Allowance for Credit Losses 0    
Unrealized Gain 629,079   424,818
Debt Securities, Available-for-sale, Unrealized Losses (420)   (8,815)
Available-for-sale securities, at fair value 14,337,253   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 2,333   5,498,654
Unamortized Premium 7   8,980
Debt Securities, Available-for-sale, Net, Unamortized (36)   (560,140)
Credit Reserve Purchase Discount     1,711,951
Amortized Cost 2,304   3,235,543
Allowance for Credit Losses 0    
Unrealized Gain 109   341,583
Debt Securities, Available-for-sale, Unrealized Losses 0   (23,263)
Available-for-sale securities, at fair value 2,413   3,553,863
Interest-Only-Strip [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]      
Debt Securities, Available-for-sale [Line Items]      
Principal/Current Face 3,649,556   2,601,693
Unamortized Premium 315,876   169,811
Debt Securities, Available-for-sale, Net, Unamortized 0   0
Credit Reserve Purchase Discount     0
Amortized Cost 315,876   169,811
Allowance for Credit Losses (17,889)    
Unrealized Gain 15,680   13,724
Debt Securities, Available-for-sale, Unrealized Losses (13,029)   (47,351)
Available-for-sale securities, at fair value 300,638   136,184
Interest-Only-Strip [Member] | Mortgage-backed Securities, Issued by Private Enterprises [Member]      
Debt Securities, Available-for-sale [Line Items]      
Principal/Current Face 2,093,032   4,356,603
Unamortized Premium 16,401   79,935
Debt Securities, Available-for-sale, Net, Unamortized 0   0
Credit Reserve Purchase Discount     0
Amortized Cost 16,401   79,935
Allowance for Credit Losses (4,639)    
Unrealized Gain 0   3,039
Debt Securities, Available-for-sale, Unrealized Losses (1,144)   (8,564)
Available-for-sale securities, at fair value $ 10,618   $ 74,410