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Residential Mortgage Securities and MSR-Related Assets (Residential and Mortgage Securities) (Details) - USD ($)
Mar. 31, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]    
Principal/ Current Face $ 2,354,515,000 $ 4,044,818,000
Purchase Premiums 22,184,000 67,108,000
Accretable Purchase Discounts (91,028,000) (90,694,000)
Discount Designated as Credit Reserve and OTTI (441,477,000) (436,598,000)
Amortized Cost 1,844,710,000 3,585,248,000
Gross Unrealized Gains 172,132,000 417,089,000
Gross Unrealized Losses (89,388,000) (18,818,000)
Net Unrealized Gain/(Loss) 82,744,000 398,271,000
Fair Value 1,927,454,000 3,983,519,000
Principal payments receivable 516,000 614,000
Agency MBS    
Debt Securities, Available-for-sale [Line Items]    
Principal/ Current Face 532,905,000 1,604,583,000
Purchase Premiums 18,921,000 62,790,000
Accretable Purchase Discounts (18,000) (22,000)
Discount Designated as Credit Reserve and OTTI (4,868,000) 0
Amortized Cost 547,456,000 1,667,965,000
Gross Unrealized Gains 5,957,000 15,326,000
Gross Unrealized Losses 0 (18,709,000)
Net Unrealized Gain/(Loss) 5,957,000 (3,383,000)
Fair Value 553,413,000 1,664,582,000
Agency MBS | Fannie Mae    
Debt Securities, Available-for-sale [Line Items]    
Principal/ Current Face 433,397,000 1,119,708,000
Purchase Premiums 15,384,000 43,249,000
Accretable Purchase Discounts (18,000) (22,000)
Discount Designated as Credit Reserve and OTTI (4,747,000) 0
Amortized Cost 444,016,000 1,162,935,000
Gross Unrealized Gains 4,242,000 9,799,000
Gross Unrealized Losses 0 (14,741,000)
Net Unrealized Gain/(Loss) 4,242,000 (4,942,000)
Fair Value 448,258,000 1,157,993,000
Agency MBS | Freddie Mac    
Debt Securities, Available-for-sale [Line Items]    
Principal/ Current Face 95,759,000 480,879,000
Purchase Premiums 3,468,000 19,468,000
Accretable Purchase Discounts 0 0
Discount Designated as Credit Reserve and OTTI (121,000) 0
Amortized Cost 99,622,000 500,961,000
Gross Unrealized Gains 1,655,000 5,475,000
Gross Unrealized Losses 0 (3,968,000)
Net Unrealized Gain/(Loss) 1,655,000 1,507,000
Fair Value 101,277,000 502,468,000
Agency MBS | Ginnie Mae    
Debt Securities, Available-for-sale [Line Items]    
Principal/ Current Face 3,749,000 3,996,000
Purchase Premiums 69,000 73,000
Accretable Purchase Discounts 0 0
Discount Designated as Credit Reserve and OTTI 0 0
Amortized Cost 3,818,000 4,069,000
Gross Unrealized Gains 60,000 52,000
Gross Unrealized Losses 0 0
Net Unrealized Gain/(Loss) 60,000 52,000
Fair Value 3,878,000 4,121,000
Non-Agency MBS    
Debt Securities, Available-for-sale [Line Items]    
Principal/ Current Face 1,455,848,000 2,195,303,000
Purchase Premiums 0 0
Accretable Purchase Discounts (90,968,000) (90,617,000)
Discount Designated as Credit Reserve and OTTI (389,472,000) (436,598,000)
Amortized Cost 975,408,000 1,668,088,000
Gross Unrealized Gains 166,175,000 395,459,000
Gross Unrealized Losses (21,643,000) (18,000)
Net Unrealized Gain/(Loss) 144,532,000 395,441,000
Fair Value 1,119,940,000 2,063,529,000
Expected to Recover Par    
Debt Securities, Available-for-sale [Line Items]    
Principal/ Current Face 150,181,000 722,477,000
Purchase Premiums 0 0
Accretable Purchase Discounts (13,191,000) (16,661,000)
Discount Designated as Credit Reserve and OTTI 0 0
Amortized Cost 136,990,000 705,816,000
Gross Unrealized Gains 6,175,000 19,861,000
Gross Unrealized Losses (21,643,000) (9,000)
Net Unrealized Gain/(Loss) (15,468,000) 19,852,000
Fair Value 121,522,000 725,668,000
Expected to Recover Less Than Par    
Debt Securities, Available-for-sale [Line Items]    
Principal/ Current Face 1,305,667,000 1,472,826,000
Purchase Premiums 0 0
Accretable Purchase Discounts (77,777,000) (73,956,000)
Discount Designated as Credit Reserve and OTTI (389,472,000) (436,598,000)
Amortized Cost 838,418,000 962,272,000
Gross Unrealized Gains 160,000,000 375,598,000
Gross Unrealized Losses 0 (9,000)
Net Unrealized Gain/(Loss) 160,000,000 375,589,000
Fair Value $ 998,418,000 $ 1,337,861,000
Percentage of current face amount of Non-Agency MBS to be recovered 73.00% 80.00%
Total MBS    
Debt Securities, Available-for-sale [Line Items]    
Principal/ Current Face $ 1,988,753,000 $ 3,799,886,000
Purchase Premiums 18,921,000 62,790,000
Accretable Purchase Discounts (90,986,000) (90,639,000)
Discount Designated as Credit Reserve and OTTI (394,340,000) (436,598,000)
Amortized Cost 1,522,864,000 3,336,053,000
Gross Unrealized Gains 172,132,000 410,785,000
Gross Unrealized Losses (21,643,000) (18,727,000)
Net Unrealized Gain/(Loss) 150,489,000 392,058,000
Fair Value 1,673,353,000 3,728,111,000
CRT securities    
Debt Securities, Available-for-sale [Line Items]    
Principal/ Current Face 365,762,000 244,932,000
Purchase Premiums 3,263,000 4,318,000
Accretable Purchase Discounts (42,000) (55,000)
Discount Designated as Credit Reserve and OTTI (47,137,000) 0
Amortized Cost 321,846,000 249,195,000
Gross Unrealized Gains 0 6,304,000
Gross Unrealized Losses (67,745,000) (91,000)
Net Unrealized Gain/(Loss) (67,745,000) 6,213,000
Fair Value 254,101,000 255,408,000
Agency MBS, Fair Value Option    
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Gains 499,000 4,500,000
Gross Unrealized Losses 0 0
Debt securities, fair value option 14,500,000 280,300,000
RPL/NPL MBS    
Debt Securities, Available-for-sale [Line Items]    
Principal/ Current Face 101,400,000 632,300,000
Amortized Cost 101,100,000 631,800,000
Fair Value 79,500,000 635,000,000.0
CRT, Fair Value Option    
Debt Securities, Available-for-sale [Line Items]    
Gross Unrealized Gains 0 6,300,000
Gross Unrealized Losses (67,700,000) (91,000)
Fair Value $ 188,600,000 $ 255,400,000