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MBS, CRT Securities and MSR Related Assets (MBS and CRT Securities) (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]      
Principal/ Current Face $ 6,250,700   $ 7,060,004
Purchase Premiums 98,919   113,003
Accretable Purchase Discounts (204,112)   (218,915)
Discount Designated as Credit Reserve and OTTI (553,596)   (593,227)
Amortized Cost 5,593,089   6,362,756
Fair Value 6,177,819   7,023,050
Gross Unrealized Gains 640,671   703,907
Gross Unrealized Losses 55,941   43,613
Net Unrealized Gain/(Loss) 584,730   660,294
Principal payments receivable 1,200   1,900
Agency MBS      
Debt Securities, Available-for-sale [Line Items]      
Principal/ Current Face 2,308,413   2,738,462
Purchase Premiums 89,051   104,066
Accretable Purchase Discounts (34)   (40)
Discount Designated as Credit Reserve and OTTI 0   0
Amortized Cost 2,398,608   2,844,379
Fair Value 2,362,897   2,824,681
Gross Unrealized Gains 18,851   23,439
Gross Unrealized Losses 54,562   43,137
Net Unrealized Gain/(Loss) (35,711)   (19,698)
Agency MBS | Fannie Mae      
Debt Securities, Available-for-sale [Line Items]      
Principal/ Current Face 1,874,754   2,170,974
Purchase Premiums 71,870   82,271
Accretable Purchase Discounts (34)   (40)
Discount Designated as Credit Reserve and OTTI 0   0
Amortized Cost 1,946,590   2,253,205
Fair Value 1,928,719   2,246,600
Gross Unrealized Gains 17,695   21,736
Gross Unrealized Losses 35,566   28,341
Net Unrealized Gain/(Loss) (17,871)   (6,605)
Agency MBS | Freddie Mac      
Debt Securities, Available-for-sale [Line Items]      
Principal/ Current Face 428,102   561,346
Purchase Premiums 17,080   21,683
Accretable Purchase Discounts 0   0
Discount Designated as Credit Reserve and OTTI 0   0
Amortized Cost 446,360   584,920
Fair Value 428,465   571,748
Gross Unrealized Gains 1,100   1,624
Gross Unrealized Losses 18,995   14,796
Net Unrealized Gain/(Loss) (17,895)   (13,172)
Agency MBS | Ginnie Mae      
Debt Securities, Available-for-sale [Line Items]      
Principal/ Current Face 5,557   6,142
Purchase Premiums 101   112
Accretable Purchase Discounts 0   0
Discount Designated as Credit Reserve and OTTI 0   0
Amortized Cost 5,658   6,254
Fair Value 5,713   6,333
Gross Unrealized Gains 56   79
Gross Unrealized Losses 1   0
Net Unrealized Gain/(Loss) 55   79
Non-Agency MBS      
Debt Securities, Available-for-sale [Line Items]      
Principal/ Current Face 3,421,599   3,718,743
Purchase Premiums 43   50
Accretable Purchase Discounts (202,248)   (215,325)
Discount Designated as Credit Reserve and OTTI (553,596)   (593,227)
Amortized Cost 2,665,798   2,910,241
Fair Value 3,242,967   3,533,966
Gross Unrealized Gains 578,455   624,178
Gross Unrealized Losses 1,286   453
Net Unrealized Gain/(Loss) 577,169   623,725
Credit reserve 540,700 $ 579,000  
OTTI 12,900   14,200
Non-Agency MBS | Expected to Recover Par      
Debt Securities, Available-for-sale [Line Items]      
Principal/ Current Face 1,122,973   1,128,808
Purchase Premiums 43   50
Accretable Purchase Discounts (27,359)   (22,737)
Discount Designated as Credit Reserve and OTTI 0   0
Amortized Cost 1,095,657   1,106,121
Fair Value 1,123,299   1,132,205
Gross Unrealized Gains 28,736   26,518
Gross Unrealized Losses 1,094   434
Net Unrealized Gain/(Loss) 27,642   26,084
Non-Agency MBS | Expected to Recover Less Than Par      
Debt Securities, Available-for-sale [Line Items]      
Principal/ Current Face 2,298,626   2,589,935
Purchase Premiums 0   0
Accretable Purchase Discounts (174,889)   (192,588)
Discount Designated as Credit Reserve and OTTI (553,596)   (593,227)
Amortized Cost 1,570,141   1,804,120
Fair Value 2,119,668   2,401,761
Gross Unrealized Gains 549,719   597,660
Gross Unrealized Losses 192   19
Net Unrealized Gain/(Loss) $ 549,527   $ 597,641
Percentage of current face amount of Non-Agency MBS to be recovered 84.00%   84.00%
Total MBS      
Debt Securities, Available-for-sale [Line Items]      
Principal/ Current Face $ 5,730,012   $ 6,457,205
Purchase Premiums 89,094   104,116
Accretable Purchase Discounts (202,282)   (215,365)
Discount Designated as Credit Reserve and OTTI (553,596)   (593,227)
Amortized Cost 5,064,406   5,754,620
Fair Value 5,605,864   6,358,647
Gross Unrealized Gains 597,306   647,617
Gross Unrealized Losses 55,848   43,590
Net Unrealized Gain/(Loss) 541,458   604,027
CRT securities      
Debt Securities, Available-for-sale [Line Items]      
Principal/ Current Face 520,688   602,799
Purchase Premiums 9,825   8,887
Accretable Purchase Discounts (1,830)   (3,550)
Discount Designated as Credit Reserve and OTTI 0   0
Amortized Cost 528,683   608,136
Fair Value 571,955   664,403
Gross Unrealized Gains 43,365   56,290
Gross Unrealized Losses 93   23
Net Unrealized Gain/(Loss) 43,272   56,267
RPL/NPL MBS      
Debt Securities, Available-for-sale [Line Items]      
Principal/ Current Face 909,300   922,000
Amortized Cost 907,500   920,100
Fair Value 907,900   923,100
CRT, Fair Value Option [Member]      
Debt Securities, Available-for-sale [Line Items]      
Fair Value 522,100   528,900
Gross Unrealized Gains 37,300   40,500
Gross Unrealized Losses $ 93   $ 23