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MBS and CRT Securities (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2016
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 $ 10,956,270 $ 11,703,896
Purchase Premiums 154,757 172,160
Accretable Purchase Discounts (331,098) (317,930)
Discount Designated as Credit Reserve and OTTI (724,198) (787,541)
Amortized Cost 10,056,400 10,771,616
Fair Value 10,685,331 11,356,643
Gross Unrealized Gains 654,714 656,956
Gross Unrealized Losses (25,783) (71,929)
Net Unrealized Gain/(Loss) 628,931 585,027
Principal payments receivable 669 1,000
Total MBS    
Schedule of MBS and CRT Securities [Line Items]    
Principal/ Current Face 10,683,635 11,511,896
Purchase Premiums 154,757 172,160
Accretable Purchase Discounts (325,604) (312,241)
Discount Designated as Credit Reserve and OTTI (724,198) (787,541)
Amortized Cost 9,789,259 10,585,305
Fair Value 10,412,762 11,173,061
Gross Unrealized Gains 648,697 656,538
Gross Unrealized Losses (25,194) (68,782)
Net Unrealized Gain/(Loss) 623,503 587,756
Agency MBS    
Schedule of MBS and CRT Securities [Line Items]    
Principal/ Current Face 4,098,997 4,550,403
Purchase Premiums 154,692 172,087
Accretable Purchase Discounts (56) (59)
Discount Designated as Credit Reserve and OTTI 0 0
Amortized Cost 4,254,302 4,723,462
Fair Value 4,307,882 4,752,244
Gross Unrealized Gains 65,173 69,207
Gross Unrealized Losses (11,593) (40,425)
Net Unrealized Gain/(Loss) 53,580 28,782
Agency MBS | Fannie Mae    
Schedule of MBS and CRT Securities [Line Items]    
Principal/ Current Face 3,311,761 3,690,020
Purchase Premiums 124,665 139,243
Accretable Purchase Discounts (56) (59)
Discount Designated as Credit Reserve and OTTI 0 0
Amortized Cost 3,436,370 3,829,204
Fair Value 3,483,200 3,865,485
Gross Unrealized Gains 56,317 62,111
Gross Unrealized Losses (9,487) (25,830)
Net Unrealized Gain/(Loss) 46,830 36,281
Agency MBS | Freddie Mac    
Schedule of MBS and CRT Securities [Line Items]    
Principal/ Current Face 778,878 851,087
Purchase Premiums 29,879 32,680
Accretable Purchase Discounts 0 0
Discount Designated as Credit Reserve and OTTI 0 0
Amortized Cost 809,426 884,798
Fair Value 815,997 877,109
Gross Unrealized Gains 8,677 6,906
Gross Unrealized Losses (2,106) (14,595)
Net Unrealized Gain/(Loss) 6,571 (7,689)
Agency MBS | Ginnie Mae    
Schedule of MBS and CRT Securities [Line Items]    
Principal/ Current Face 8,358 9,296
Purchase Premiums 148 164
Accretable Purchase Discounts 0 0
Discount Designated as Credit Reserve and OTTI 0 0
Amortized Cost 8,506 9,460
Fair Value 8,685 9,650
Gross Unrealized Gains 179 190
Gross Unrealized Losses 0 0
Net Unrealized Gain/(Loss) 179 190
Non-Agency MBS    
Schedule of MBS and CRT Securities [Line Items]    
Principal/ Current Face 6,584,638 6,961,493
Purchase Premiums 65 73
Accretable Purchase Discounts (325,548) (312,182)
Discount Designated as Credit Reserve and OTTI (724,198) (787,541)
Amortized Cost 5,534,957 5,861,843
Fair Value 6,104,880 6,420,817
Gross Unrealized Gains 583,524 587,331
Gross Unrealized Losses (13,601) (28,357)
Net Unrealized Gain/(Loss) 569,923 558,974
Credit Reserve 703,300 766,000
OTTI 20,900 21,500
Non-Agency MBS | Expected to Recover Par    
Schedule of MBS and CRT Securities [Line Items]    
Principal/ Current Face 2,903,420 2,906,878
Purchase Premiums 65 73
Accretable Purchase Discounts (35,991) (31,576)
Discount Designated as Credit Reserve and OTTI 0 0
Amortized Cost 2,867,494 2,875,375
Fair Value 2,892,151 2,878,532
Gross Unrealized Gains 32,196 23,300
Gross Unrealized Losses (7,539) (20,143)
Net Unrealized Gain/(Loss) 24,657 3,157
Non-Agency MBS | Expected to Recover Less Than Par    
Schedule of MBS and CRT Securities [Line Items]    
Principal/ Current Face 3,681,218 4,054,615
Purchase Premiums 0 0
Accretable Purchase Discounts (289,557) (280,606)
Discount Designated as Credit Reserve and OTTI (724,198) (787,541)
Amortized Cost 2,667,463 2,986,468
Fair Value 3,212,729 3,542,285
Gross Unrealized Gains 551,328 564,031
Gross Unrealized Losses (6,062) (8,214)
Net Unrealized Gain/(Loss) $ 545,266 $ 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 $ 272,635 $ 192,000
Purchase Premiums 0 0
Accretable Purchase Discounts (5,494) (5,689)
Discount Designated as Credit Reserve and OTTI 0 0
Amortized Cost 267,141 186,311
Fair Value 272,569 183,582
Gross Unrealized Gains 6,017 418
Gross Unrealized Losses (589) (3,147)
Net Unrealized Gain/(Loss) 5,428 (2,729)
CRT securities | Fair value option elected, debt securities    
Schedule of MBS and CRT Securities [Line Items]    
Fair Value 146,300 62,200
Gross Unrealized Gains 3,500 332
Gross Unrealized Losses (273) (555)
Net Unrealized Gain/(Loss) $ 3,200 (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 $ 2,600,000 2,600,000
Amortized Cost 2,600,000 2,600,000
Fair Value 2,600,000 $ 2,600,000
Gross Unrealized Losses $ (6,800)