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Investments in Debt Securities Investments in Debt Securities (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Investment [Line Items]      
Par value of available for sale debt security $ 3,194,441 $ 2,446,491  
Investments, Unamortized Premium (Discount) 590,968 736,128  
Debt Securities, Available-for-sale, Amortized Cost 3,785,409 3,182,619  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 21,436 17,185  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 57,381 26,285  
Debt Securities, Available-for-sale 3,749,464 3,173,519  
Proceeds from Sale of Available-for-sale Securities 733,064 1,073,093 $ 87,818
Debt Securities, Available-for-sale, Realized Gain (Loss) (23,373) (11,530) (4,238)
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Amortized Cost 39,868 4,480  
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Fair Value 39,808 4,542  
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after One Through Five Years, Amortized Cost 151,041 208,046  
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after One Through Five Years, Fair Value 152,917 210,727  
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after Five Through Ten Years, Amortized Cost 828,543 1,334,795  
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after Five Through Ten Years, Fair Value 806,015 1,326,178  
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Amortized Cost 2,765,957 1,635,298  
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Fair Value 2,750,724 1,632,072  
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost 3,785,409 3,182,619  
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value 3,749,464 3,173,519  
Agency MBS      
Investment [Line Items]      
Notional balance for interest only securities 13,048,666 14,196,122  
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 581,440 1,293,798  
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss $ 1,793 $ 9,769  
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year 28 71  
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value $ 1,543,892 $ 423,698  
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss $ 54,260 $ 14,035  
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year 88 30  
Non-Agency MBS      
Investment [Line Items]      
Notional balance for interest only securities $ 10,275,494 $ 11,006,463  
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 70,876 51,406  
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss $ 581 $ 421  
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year 22 11  
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value $ 46,154 $ 20,414  
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss $ 747 $ 323  
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year 19 12  
Residential Mortgage Backed Securities      
Investment [Line Items]      
Par value of available for sale debt security $ 2,119,495 $ 1,147,623  
Investments, Unamortized Premium (Discount) 56,744 46,021  
Debt Securities, Available-for-sale, Amortized Cost 2,176,239 1,193,644  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 8,926 1,667  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 26,286 9,959  
Debt Securities, Available-for-sale 2,158,879 1,185,352  
Commercial Mortgage Backed Securities      
Investment [Line Items]      
Par value of available for sale debt security 1,074,946 1,150,468  
Investments, Unamortized Premium (Discount) 6,481 6,407  
Debt Securities, Available-for-sale, Amortized Cost 1,081,427 1,156,875  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 6,554 5,812  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 29,550 13,572  
Debt Securities, Available-for-sale 1,058,431 1,149,115  
Interest-Only-Strip      
Investment [Line Items]      
Investments, Unamortized Premium (Discount) 527,743 683,833  
Debt Securities, Available-for-sale, Amortized Cost 527,743 683,833  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 5,956 9,706  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 1,545 1,017  
Debt Securities, Available-for-sale 532,154 692,522  
U.S. Treasuries      
Investment [Line Items]      
Par value of available for sale debt security 0 148,400  
Investments, Unamortized Premium (Discount) 0 (133)  
Debt Securities, Available-for-sale, Amortized Cost 0 148,267  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 0 0  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 0 1,737  
Debt Securities, Available-for-sale $ 0 $ 146,530  
Investments, Weighted Average Coupon Rate 0.00% [1] 2.13%  
Proceeds from Sale of Available-for-sale Securities $ 248,803 $ 51,797  
Debt Securities, Available-for-sale, Realized Loss (6,567) (244)  
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 0 146,530  
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss $ 0 $ 1,737  
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year 0 1  
Agency | Residential Mortgage Backed Securities      
Investment [Line Items]      
Par value of available for sale debt security $ 2,118,639 $ 1,146,553  
Investments, Unamortized Premium (Discount) 56,744 46,021  
Debt Securities, Available-for-sale, Amortized Cost 2,175,383 1,192,574  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 8,902 1,626  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 26,264 9,939  
Debt Securities, Available-for-sale $ 2,158,021 $ 1,184,261  
Investments, Weighted Average Coupon Rate [1] 3.95% 3.56%  
Proceeds from Sale of Available-for-sale Securities $ 217,837 $ 716,560 54,178
Debt Securities, Available-for-sale, Realized Loss (7,785) (12,392) (3,010)
Agency | Commercial Mortgage Backed Securities      
Investment [Line Items]      
Par value of available for sale debt security 1,071,906 1,123,967  
Investments, Unamortized Premium (Discount) 8,518 10,442  
Debt Securities, Available-for-sale, Amortized Cost 1,080,424 1,134,409  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 6,141 3,514  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 29,550 13,572  
Debt Securities, Available-for-sale $ 1,057,015 $ 1,124,351  
Investments, Weighted Average Coupon Rate [1] 3.22% 3.03%  
Proceeds from Sale of Available-for-sale Securities $ 242,029 $ 252,624  
Debt Securities, Available-for-sale, Realized Loss (9,218) (135)  
Agency | Interest-Only-Strip      
Investment [Line Items]      
Investments, Unamortized Premium (Discount) 287,062 375,361  
Debt Securities, Available-for-sale, Amortized Cost 287,062 375,361  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 4,281 5,238  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 239 293  
Debt Securities, Available-for-sale $ 291,104 $ 380,306  
Investments, Weighted Average Coupon Rate [1] 0.55% 0.62%  
Proceeds from Sale of Available-for-sale Securities $ 15,700    
Debt Securities, Available-for-sale, Realized Gain 146    
Non-Agency | Residential Mortgage Backed Securities      
Investment [Line Items]      
Par value of available for sale debt security 856 $ 1,070  
Investments, Unamortized Premium (Discount) 0 0  
Debt Securities, Available-for-sale, Amortized Cost 856 1,070  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 24 41  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 22 20  
Debt Securities, Available-for-sale $ 858 $ 1,091  
Investments, Weighted Average Coupon Rate [1] 6.75% 6.75%  
Proceeds from Sale of Available-for-sale Securities   $ 16,407  
Debt Securities, Available-for-sale, Realized Gain   42  
Non-Agency | Commercial Mortgage Backed Securities      
Investment [Line Items]      
Par value of available for sale debt security $ 3,040 26,501  
Investments, Unamortized Premium (Discount) (2,037) (4,035)  
Debt Securities, Available-for-sale, Amortized Cost 1,003 22,466  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 413 2,298  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 0 0  
Debt Securities, Available-for-sale $ 1,416 $ 24,764  
Investments, Weighted Average Coupon Rate [1] 6.47% 5.47%  
Proceeds from Sale of Available-for-sale Securities   $ 35,705 33,640
Debt Securities, Available-for-sale, Realized Loss     $ (1,228)
Debt Securities, Available-for-sale, Realized Gain   1,199  
Non-Agency | Interest-Only-Strip      
Investment [Line Items]      
Investments, Unamortized Premium (Discount) $ 240,681 308,472  
Debt Securities, Available-for-sale, Amortized Cost 240,681 308,472  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 1,675 4,468  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 1,306 724  
Debt Securities, Available-for-sale $ 241,050 $ 312,216  
Investments, Weighted Average Coupon Rate [1] 0.57% 0.61%  
Proceeds from Sale of Available-for-sale Securities $ 8,695    
Debt Securities, Available-for-sale, Realized Gain $ 51    
[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).