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MBS and CRT Securities (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Schedule of MBS and CRT Securities [Line Items]      
Minimum term of fixed rate mortgages underlying MBS, years 15 years    
Principal/ Current Face $ 11,211,339   $ 11,703,896
Purchase Premiums 164,016   172,160
Accretable Purchase Discounts (287,854)   (317,930)
Discount Designated as Credit Reserve and OTTI (757,564)   (787,541)
Amortized Cost 10,331,055   10,771,616
Fair Value 10,861,443   11,356,643
Gross Unrealized Gains 582,745   656,956
Gross Unrealized Losses (52,357)   (71,929)
Net Unrealized Gain/(Loss) 530,388   585,027
Principal payments receivable 1,100   1,000
Total MBS      
Schedule of MBS and CRT Securities [Line Items]      
Principal/ Current Face 10,989,254   11,511,896
Purchase Premiums 164,016   172,160
Accretable Purchase Discounts (281,388)   (312,241)
Discount Designated as Credit Reserve and OTTI (757,564)   (787,541)
Amortized Cost 10,115,436   10,585,305
Fair Value 10,645,640   11,173,061
Gross Unrealized Gains 581,077   656,538
Gross Unrealized Losses (50,873)   (68,782)
Net Unrealized Gain/(Loss) 530,204   587,756
Agency Mortgage Backed Securities      
Schedule of MBS and CRT Securities [Line Items]      
Principal/ Current Face 4,337,864   4,550,403
Purchase Premiums 163,950   172,087
Accretable Purchase Discounts (57)   (59)
Discount Designated as Credit Reserve and OTTI 0   0
Amortized Cost 4,502,875   4,723,462
Fair Value 4,544,883   4,752,244
Gross Unrealized Gains 61,845   69,207
Gross Unrealized Losses (19,837)   (40,425)
Net Unrealized Gain/(Loss) 42,008   28,782
Agency Mortgage Backed Securities | Fannie Mae      
Schedule of MBS and CRT Securities [Line Items]      
Principal/ Current Face 3,512,731   3,690,020
Purchase Premiums 132,452   139,243
Accretable Purchase Discounts (57)   (59)
Discount Designated as Credit Reserve and OTTI 0   0
Amortized Cost 3,645,126   3,829,204
Fair Value 3,684,575   3,865,485
Gross Unrealized Gains 54,304   62,111
Gross Unrealized Losses (14,855)   (25,830)
Net Unrealized Gain/(Loss) 39,449   36,281
Agency Mortgage Backed Securities | Freddie Mac      
Schedule of MBS and CRT Securities [Line Items]      
Principal/ Current Face 816,393   851,087
Purchase Premiums 31,343   32,680
Accretable Purchase Discounts 0   0
Discount Designated as Credit Reserve and OTTI 0   0
Amortized Cost 848,854   884,798
Fair Value 851,230   877,109
Gross Unrealized Gains 7,358   6,906
Gross Unrealized Losses (4,982)   (14,595)
Net Unrealized Gain/(Loss) 2,376   (7,689)
Agency Mortgage Backed Securities | Ginnie Mae      
Schedule of MBS and CRT Securities [Line Items]      
Principal/ Current Face 8,740   9,296
Purchase Premiums 155   164
Accretable Purchase Discounts 0   0
Discount Designated as Credit Reserve and OTTI 0   0
Amortized Cost 8,895   9,460
Fair Value 9,078   9,650
Gross Unrealized Gains 183   190
Gross Unrealized Losses 0   0
Net Unrealized Gain/(Loss) 183   190
Non-Agency MBS      
Schedule of MBS and CRT Securities [Line Items]      
Principal/ Current Face 6,651,390   6,961,493
Purchase Premiums 66   73
Accretable Purchase Discounts (281,331)   (312,182)
Discount Designated as Credit Reserve and OTTI (757,564)   (787,541)
Amortized Cost 5,612,561   5,861,843
Fair Value 6,100,757   6,420,817
Gross Unrealized Gains 519,232   587,331
Gross Unrealized Losses (31,036)   (28,357)
Net Unrealized Gain/(Loss) 488,196   558,974
Credit Reserve 736,400 $ 766,000  
OTTI 21,200   21,500
Non-Agency MBS | Expected to Recover Par      
Schedule of MBS and CRT Securities [Line Items]      
Principal/ Current Face 2,774,846   2,906,878
Purchase Premiums 66   73
Accretable Purchase Discounts (28,004)   (31,576)
Discount Designated as Credit Reserve and OTTI 0   0
Amortized Cost 2,746,908   2,875,375
Fair Value 2,747,272   2,878,532
Gross Unrealized Gains 19,377   23,300
Gross Unrealized Losses (19,013)   (20,143)
Net Unrealized Gain/(Loss) 364   3,157
Non-Agency MBS | Expected to Recover Less Than Par      
Schedule of MBS and CRT Securities [Line Items]      
Principal/ Current Face 3,876,544   4,054,615
Purchase Premiums 0   0
Accretable Purchase Discounts (253,327)   (280,606)
Discount Designated as Credit Reserve and OTTI (757,564)   (787,541)
Amortized Cost 2,865,653   2,986,468
Fair Value 3,353,485   3,542,285
Gross Unrealized Gains 499,855   564,031
Gross Unrealized Losses (12,023)   (8,214)
Net Unrealized Gain/(Loss) $ 487,832   $ 555,817
Percentage of current face amount of Non-Agency MBS to be recovered 89.00%   89.00%
CRT securities      
Schedule of MBS and CRT Securities [Line Items]      
Principal/ Current Face $ 222,085   $ 192,000
Purchase Premiums 0   0
Accretable Purchase Discounts (6,466)   (5,689)
Discount Designated as Credit Reserve and OTTI 0   0
Amortized Cost 215,619   186,311
Fair Value 215,803   183,582
Gross Unrealized Gains 1,668   418
Gross Unrealized Losses (1,484)   (3,147)
Net Unrealized Gain/(Loss) 184   (2,729)
CRT securities | Fair value option elected, debt securities      
Schedule of MBS and CRT Securities [Line Items]      
Fair Value 92,900   62,200
Gross Unrealized Gains 1,400   332
Gross Unrealized Losses (132)   (555)
Net Unrealized Gain/(Loss) $ 1,200   (223)
RPL/NPL MBS      
Schedule of MBS and CRT Securities [Line Items]      
Debt Instrument, Basis Spread on Variable Rate, percentage 3.00%    
Debt Instrument, Coupon Step-Up Period 36 months    
Principal/ Current Face $ 2,515,000   2,648,000
Amortized Cost 2,514,000   2,645,000
Fair Value 2,496,000   $ 2,626,000
Gross Unrealized Losses $ (17,800)