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Investments in Debt Securities (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]          
Available-for-sale Securities, Par Balance $ 2,756,476   $ 2,756,476   $ 2,446,491
Available-for-sale Securities, Net Premium (Discount) 624,108   624,108   736,128
Available-for-sale Debt Securities, Amortized Cost Basis 3,380,584   3,380,584   3,182,619
Available-for-sale Securities, Gross Unrealized Gain 7,600   7,600   17,185
Available-for-sale Securities, Gross Unrealized Loss (93,674)   (93,674)   (26,285)
Available-for-sale Securities, Fair Value 3,294,510   3,294,510   3,173,519
Available-for-sale Securities, Sale Proceeds 116,651 $ 406,935 642,900 $ 975,665  
Available-for-sale Securities, Gross Realized Gain (Loss) (1,726) (5,211) (17,945) (10,628)  
Available-for-sale Securities, Debt Maturities, Next Rolling Twelve Months, Amortized Cost Basis 47,271   47,271   4,480
Available-for-sale Securities, Debt Maturities, Rolling Year Two Through Five, Amortized Cost Basis 158,325   158,325   208,046
Available-for-sale Securities, Debt Maturities, Rolling Year Six Through Ten, Amortized Cost Basis 935,687   935,687   1,334,795
Available-for-sale Securities, Debt Maturities, Rolling after Year Ten, Amortized Cost Basis 2,239,301   2,239,301   1,635,298
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis 3,380,584   3,380,584   3,182,619
Available-for-sale Securities, Debt Maturities, Next Rolling Twelve Months, Fair Value 47,217   47,217   4,542
Available-for-sale Securities, Debt Maturities, Rolling Year Two Through Five, Fair Value 159,007   159,007   210,727
Available-for-sale Securities, Debt Maturities, Rolling Year Six Through Ten, Fair Value 893,930   893,930   1,326,178
Available-for-sale Securities, Debt Maturities, Rolling after Year Ten, Fair Value 2,194,356   2,194,356   1,632,072
Available-for-sale Securities, Debt Maturities, Single Maturity Date 3,294,510   3,294,510   3,173,519
Agency MBS          
Schedule of Available-for-sale Securities [Line Items]          
Available-for-sale Securities, Continuous Unrealized Loss Position for less than 12 months, Fair Value 1,540,220   1,540,220   1,293,798
Available-for-sale Securities, Continuous Unrealized Loss Position for less than 12 months, Accumulated Loss $ (29,765)   $ (29,765)   $ (9,769)
Available-for-sale Securities, Number of Securities in Continuous Unrealized Loss Position for less than 12 months 91   91   71
Available-for-sale Securities, Continuous Unrealized Loss Position for 12 months or longer, Fair Value $ 1,064,620   $ 1,064,620   $ 423,698
Available-for-sale Securities, Continuous Unrealized Loss Position for 12 months or longer, Accumulated Loss $ (62,929)   $ (62,929)   $ (14,035)
Available-for-sale Securities, Number of Securities in Continuous Unrealized Loss Position for 12 months or longer 58   58   30
Non-Agency MBS          
Schedule of Available-for-sale Securities [Line Items]          
Available-for-sale Securities, Continuous Unrealized Loss Position for less than 12 months, Fair Value $ 79,326   $ 79,326   $ 51,406
Available-for-sale Securities, Continuous Unrealized Loss Position for less than 12 months, Accumulated Loss $ (447)   $ (447)   $ (421)
Available-for-sale Securities, Number of Securities in Continuous Unrealized Loss Position for less than 12 months 23   23   11
Available-for-sale Securities, Continuous Unrealized Loss Position for 12 months or longer, Fair Value $ 31,282   $ 31,282   $ 20,414
Available-for-sale Securities, Continuous Unrealized Loss Position for 12 months or longer, Accumulated Loss $ (533)   $ (533)   $ (323)
Available-for-sale Securities, Number of Securities in Continuous Unrealized Loss Position for 12 months or longer 13   13   12
U.S. Treasuries          
Schedule of Available-for-sale Securities [Line Items]          
Available-for-sale Securities, Par Balance $ 0   $ 0   $ 148,400
Available-for-sale Securities, Net Premium (Discount) 0   0   (133)
Available-for-sale Debt Securities, Amortized Cost Basis 0   0   148,267
Available-for-sale Securities, Gross Unrealized Gain 0   0   0
Available-for-sale Securities, Gross Unrealized Loss 0   0   (1,737)
Available-for-sale Securities, Fair Value $ 0   $ 0   $ 146,530
Available-for-sale Securities, Weighted Average Coupon 0.00%   0.00%   2.13%
Available-for-sale Securities, Sale Proceeds $ 57,843 0 $ 248,802 0  
Available-for-sale Securities, Gross Realized Gains   0   0  
Available-for-sale Securities, Gross Realized Losses (133)   (6,567)    
Available-for-sale Securities, Continuous Unrealized Loss Position for less than 12 months, Fair Value 0   0   $ 146,530
Available-for-sale Securities, Continuous Unrealized Loss Position for less than 12 months, Accumulated Loss $ 0   $ 0   $ (1,737)
Available-for-sale Securities, Number of Securities in Continuous Unrealized Loss Position for less than 12 months 0   0   1
CMBS          
Schedule of Available-for-sale Securities [Line Items]          
Available-for-sale Securities, Par Balance $ 994,293   $ 994,293   $ 1,150,468
Available-for-sale Securities, Net Premium (Discount) 6,689   6,689   6,407
Available-for-sale Debt Securities, Amortized Cost Basis 1,000,982   1,000,982   1,156,875
Available-for-sale Securities, Gross Unrealized Gain 1,762   1,762   5,812
Available-for-sale Securities, Gross Unrealized Loss (49,125)   (49,125)   (13,572)
Available-for-sale Securities, Fair Value 953,619   953,619   1,149,115
CMBS | Agency MBS          
Schedule of Available-for-sale Securities [Line Items]          
Available-for-sale Securities, Par Balance 987,266   987,266   1,123,967
Available-for-sale Securities, Net Premium (Discount) 9,792   9,792   10,442
Available-for-sale Debt Securities, Amortized Cost Basis 997,058   997,058   1,134,409
Available-for-sale Securities, Gross Unrealized Gain 363   363   3,514
Available-for-sale Securities, Gross Unrealized Loss (49,125)   (49,125)   (13,572)
Available-for-sale Securities, Fair Value $ 948,296   $ 948,296   $ 1,124,351
Available-for-sale Securities, Weighted Average Coupon [1] 3.08%   3.08%   3.03%
Available-for-sale Securities, Sale Proceeds $ 48,237 13,433 $ 156,995 206,993  
Available-for-sale Securities, Gross Realized Gains       523  
Available-for-sale Securities, Gross Realized Losses (1,720) (51) (3,771)    
CMBS | Non-Agency MBS          
Schedule of Available-for-sale Securities [Line Items]          
Available-for-sale Securities, Par Balance 7,027   7,027   $ 26,501
Available-for-sale Securities, Net Premium (Discount) (3,103)   (3,103)   (4,035)
Available-for-sale Debt Securities, Amortized Cost Basis 3,924   3,924   22,466
Available-for-sale Securities, Gross Unrealized Gain 1,399   1,399   2,298
Available-for-sale Securities, Gross Unrealized Loss 0   0   0
Available-for-sale Securities, Fair Value $ 5,323   $ 5,323   $ 24,764
Available-for-sale Securities, Weighted Average Coupon [1] 8.90%   8.90%   5.47%
Available-for-sale Securities, Sale Proceeds     $ 0 16,407  
Available-for-sale Securities, Gross Realized Gains     0 42  
CMBS IO          
Schedule of Available-for-sale Securities [Line Items]          
Available-for-sale Securities, Par Balance $ 0   0   $ 0
Available-for-sale Securities, Net Premium (Discount) 562,327   562,327   683,833
Available-for-sale Debt Securities, Amortized Cost Basis 562,327   562,327   683,833
Available-for-sale Securities, Gross Unrealized Gain 4,600   4,600   9,706
Available-for-sale Securities, Gross Unrealized Loss (2,101)   (2,101)   (1,017)
Available-for-sale Securities, Fair Value 564,826   564,826   692,522
CMBS IO | Agency MBS          
Schedule of Available-for-sale Securities [Line Items]          
Available-for-sale Securities, Par Balance 0 [2]   0 [2]   0 [3]
Available-for-sale Securities, Net Premium (Discount) 308,174   308,174   375,361
Available-for-sale Debt Securities, Amortized Cost Basis 308,174   308,174   375,361
Available-for-sale Securities, Gross Unrealized Gain 2,197   2,197   5,238
Available-for-sale Securities, Gross Unrealized Loss (1,141)   (1,141)   (293)
Available-for-sale Securities, Fair Value $ 309,230   $ 309,230   $ 380,306
Available-for-sale Securities, Weighted Average Coupon [1] 0.59%   0.59%   0.62%
Notional balance for interest only securities $ 13,238,960   $ 13,238,960   $ 14,196,122
Available-for-sale Securities, Sale Proceeds 10,571 0 10,571 0  
Available-for-sale Securities, Gross Realized Gains 127 0 127 0  
CMBS IO | Non-Agency MBS          
Schedule of Available-for-sale Securities [Line Items]          
Available-for-sale Securities, Par Balance [2] 0   0    
Available-for-sale Securities, Net Premium (Discount) 254,153   254,153   308,472
Available-for-sale Debt Securities, Amortized Cost Basis 254,153   254,153   308,472
Available-for-sale Securities, Gross Unrealized Gain 2,403   2,403   4,468
Available-for-sale Securities, Gross Unrealized Loss (960)   (960)   (724)
Available-for-sale Securities, Fair Value $ 255,596   $ 255,596   $ 312,216
Available-for-sale Securities, Weighted Average Coupon [1] 0.59%   0.59%   0.61%
Notional balance for interest only securities $ 10,391,240   $ 10,391,240   $ 11,006,463
Available-for-sale Securities, Sale Proceeds     8,695 0  
Available-for-sale Securities, Gross Realized Gains     51 0  
RMBS          
Schedule of Available-for-sale Securities [Line Items]          
Available-for-sale Securities, Par Balance 1,762,183   1,762,183   1,147,623
Available-for-sale Securities, Net Premium (Discount) 55,092   55,092   46,021
Available-for-sale Debt Securities, Amortized Cost Basis 1,817,275   1,817,275   1,193,644
Available-for-sale Securities, Gross Unrealized Gain 1,238   1,238   1,667
Available-for-sale Securities, Gross Unrealized Loss (42,448)   (42,448)   (9,959)
Available-for-sale Securities, Fair Value 1,776,065   1,776,065   1,185,352
RMBS | Agency MBS          
Schedule of Available-for-sale Securities [Line Items]          
Available-for-sale Securities, Par Balance 1,761,274   1,761,274   1,146,553 [4]
Available-for-sale Securities, Net Premium (Discount) 55,092   55,092   46,021 [4]
Available-for-sale Debt Securities, Amortized Cost Basis 1,816,366   1,816,366   1,192,574 [4]
Available-for-sale Securities, Gross Unrealized Gain 1,214   1,214   1,626 [4]
Available-for-sale Securities, Gross Unrealized Loss (42,428)   (42,428)   (9,939) [4]
Available-for-sale Securities, Fair Value $ 1,775,152   $ 1,775,152   $ 1,184,261 [4]
Available-for-sale Securities, Weighted Average Coupon [1] 3.92%   3.92%   3.56% [4]
Available-for-sale Securities, Sale Proceeds $ 0 393,502 $ 217,837 716,560  
Available-for-sale Securities, Gross Realized Losses 0 $ (5,160) (7,785) (12,392)  
RMBS | Non-Agency MBS          
Schedule of Available-for-sale Securities [Line Items]          
Available-for-sale Securities, Par Balance 909   909   $ 1,070
Available-for-sale Securities, Net Premium (Discount) 0   0   0
Available-for-sale Debt Securities, Amortized Cost Basis 909   909   1,070
Available-for-sale Securities, Gross Unrealized Gain 24   24   41
Available-for-sale Securities, Gross Unrealized Loss (20)   (20)   (20)
Available-for-sale Securities, Fair Value $ 913   $ 913   $ 1,091
Available-for-sale Securities, Weighted Average Coupon [1] 6.75%   6.75%   6.75%
Available-for-sale Securities, Sale Proceeds     $ 0 35,705  
Available-for-sale Securities, Gross Realized Gains     $ 0 $ 1,199  
[1] The weighted average coupon (“WAC”) is the gross interest rate of the security weighted by the outstanding principal balance (or by notional balance in the case of an IO security).
[2] The notional balance for Agency CMBS IO and non-Agency CMBS IO was $13,238,960 and $10,391,240 respectively, as of September 30, 2018.
[3] The notional balance for the Agency CMBS IO and non-Agency CMBS IO was $14,196,122 and $11,006,463, respectively, as of December 31, 2017.
[4] Includes purchased securities pending settlement.