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MBS, CRT Securities and MSR Related Assets (MBS and CRT Securities) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]      
Principal/ Current Face $ 6,778,139   $ 7,060,004
Purchase Premiums 108,458   113,003
Accretable Purchase Discounts (202,744)   (218,915)
Discount Designated as Credit Reserve and OTTI (572,580)   (593,227)
Amortized Cost 6,111,877   6,362,756
Fair Value 6,724,893   7,023,050
Gross Unrealized Gains 668,525   703,907
Gross Unrealized Losses 55,509   43,613
Net Unrealized Gain/(Loss) 613,016   660,294
Principal payments receivable 604   1,900
Total MBS      
Schedule of Available-for-sale Securities [Line Items]      
Principal/ Current Face 6,160,788   6,457,205
Purchase Premiums 98,446   104,116
Accretable Purchase Discounts (199,695)   (215,365)
Discount Designated as Credit Reserve and OTTI (572,580)   (593,227)
Amortized Cost 5,487,563   5,754,620
Fair Value 6,045,402   6,358,647
Gross Unrealized Gains 613,084   647,617
Gross Unrealized Losses 55,245   43,590
Net Unrealized Gain/(Loss) 557,839   604,027
Agency MBS      
Schedule of Available-for-sale Securities [Line Items]      
Principal/ Current Face 2,577,932   2,738,462
Purchase Premiums 98,398   104,066
Accretable Purchase Discounts (36)   (40)
Discount Designated as Credit Reserve and OTTI 0   0
Amortized Cost 2,676,898   2,844,379
Fair Value 2,647,148   2,824,681
Gross Unrealized Gains 24,808   23,439
Gross Unrealized Losses 54,558   43,137
Net Unrealized Gain/(Loss) (29,750)   (19,698)
Agency MBS | Fannie Mae      
Schedule of Available-for-sale Securities [Line Items]      
Principal/ Current Face 2,038,059   2,170,974
Purchase Premiums 77,640   82,271
Accretable Purchase Discounts (36)   (40)
Discount Designated as Credit Reserve and OTTI 0   0
Amortized Cost 2,115,663   2,253,205
Fair Value 2,106,021   2,246,600
Gross Unrealized Gains 23,283   21,736
Gross Unrealized Losses 32,925   28,341
Net Unrealized Gain/(Loss) (9,642)   (6,605)
Agency MBS | Freddie Mac      
Schedule of Available-for-sale Securities [Line Items]      
Principal/ Current Face 534,008   561,346
Purchase Premiums 20,650   21,683
Accretable Purchase Discounts 0   0
Discount Designated as Credit Reserve and OTTI 0   0
Amortized Cost 555,262   584,920
Fair Value 535,084   571,748
Gross Unrealized Gains 1,455   1,624
Gross Unrealized Losses 21,633   14,796
Net Unrealized Gain/(Loss) (20,178)   (13,172)
Agency MBS | Ginnie Mae      
Schedule of Available-for-sale Securities [Line Items]      
Principal/ Current Face 5,865   6,142
Purchase Premiums 108   112
Accretable Purchase Discounts 0   0
Discount Designated as Credit Reserve and OTTI 0   0
Amortized Cost 5,973   6,254
Fair Value 6,043   6,333
Gross Unrealized Gains 70   79
Gross Unrealized Losses 0   0
Net Unrealized Gain/(Loss) 70   79
Non-Agency MBS      
Schedule of Available-for-sale Securities [Line Items]      
Principal/ Current Face 3,582,856   3,718,743
Purchase Premiums 48   50
Accretable Purchase Discounts (199,659)   (215,325)
Discount Designated as Credit Reserve and OTTI (572,580)   (593,227)
Amortized Cost 2,810,665   2,910,241
Fair Value 3,398,254   3,533,966
Gross Unrealized Gains 588,276   624,178
Gross Unrealized Losses 687   453
Net Unrealized Gain/(Loss) 587,589   623,725
Credit reserve 558,500 $ 579,000  
OTTI 14,000   14,200
Non-Agency MBS | Expected to Recover Par      
Schedule of Available-for-sale Securities [Line Items]      
Principal/ Current Face 1,143,670   1,128,808
Purchase Premiums 48   50
Accretable Purchase Discounts (22,636)   (22,737)
Discount Designated as Credit Reserve and OTTI 0   0
Amortized Cost 1,121,082   1,106,121
Fair Value 1,145,482   1,132,205
Gross Unrealized Gains 24,927   26,518
Gross Unrealized Losses 527   434
Net Unrealized Gain/(Loss) 24,400   26,084
Non-Agency MBS | Expected to Recover Less Than Par      
Schedule of Available-for-sale Securities [Line Items]      
Principal/ Current Face 2,439,186   2,589,935
Purchase Premiums 0   0
Accretable Purchase Discounts (177,023)   (192,588)
Discount Designated as Credit Reserve and OTTI (572,580)   (593,227)
Amortized Cost 1,689,583   1,804,120
Fair Value 2,252,772   2,401,761
Gross Unrealized Gains 563,349   597,660
Gross Unrealized Losses 160   19
Net Unrealized Gain/(Loss) $ 563,189   $ 597,641
Percentage of current face amount of Non-Agency MBS to be recovered 84.00%   84.00%
CRT securities      
Schedule of Available-for-sale Securities [Line Items]      
Principal/ Current Face $ 617,351   $ 602,799
Purchase Premiums 10,012   8,887
Accretable Purchase Discounts (3,049)   (3,550)
Discount Designated as Credit Reserve and OTTI 0   0
Amortized Cost 624,314   608,136
Fair Value 679,491   664,403
Gross Unrealized Gains 55,441   56,290
Gross Unrealized Losses 264   23
Net Unrealized Gain/(Loss) 55,177   56,267
CRT securities | Fair value option elected, debt securities      
Schedule of Available-for-sale Securities [Line Items]      
Fair Value 546,300   528,900
Gross Unrealized Gains 39,800   40,500
Gross Unrealized Losses 264   23
RPL/NPL MBS      
Schedule of Available-for-sale Securities [Line Items]      
Principal/ Current Face 935,100   922,000
Amortized Cost 933,200   920,100
Fair Value $ 935,200   $ 923,100