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Investments in Debt Securities Investments in Debt Securities (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Investments [Line Items]          
Par value of available for sale debt security $ 2,906,419,000   $ 2,906,419,000   $ 4,455,808,000
Investments, Unamortized Premium (Discount) 508,778,000   508,778,000   558,549,000
Debt Securities, Available-for-sale, Amortized Cost 3,415,197,000   3,415,197,000   5,014,357,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 86,106,000   86,106,000   175,157,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (4,378,000)   (4,378,000)   (1,351,000)
Debt Securities, Available-for-sale 3,496,925,000   3,496,925,000   5,188,163,000
Proceeds from Sale of Available-for-sale Securities 2,391,334,000 $ 432,552,000 4,382,368,000 $ 432,552,000  
Debt Securities, Available-for-sale, Realized Gain (Loss) 193,099,000 (10,360,000) 277,882,000 (10,360,000)  
Receivables from Brokers-Dealers and Clearing Organizations 156,047,000   156,047,000   0
Securities sold, unsettled, at amortized cost 152,363,000   152,363,000    
Debt Securities, Available-for-sale, Allowance for Credit Loss 0   0    
Agency MBS          
Investments [Line Items]          
Notional balance for interest only securities 13,007,113,000   13,007,113,000   13,404,824,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 87,603,000   87,603,000   215,792,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss $ 2,304,000   $ 2,304,000   $ 1,139,000
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year 26   26   27
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value $ 1,225,000   $ 1,225,000   $ 75,745,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss $ 128,000   $ 128,000   $ 35,000
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year 3   3   2
Interest-Only-Strip          
Investments [Line Items]          
Par value of available for sale debt security $ 0 [1]   $ 0 [1]   $ 0 [2]
Investments, Unamortized Premium (Discount) 435,271,000   435,271,000   488,145,000
Debt Securities, Available-for-sale, Amortized Cost 435,271,000   435,271,000   488,145,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 5,731,000   5,731,000   11,760,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (4,332,000)   (4,332,000)   (863,000)
Debt Securities, Available-for-sale 436,670,000   436,670,000   499,042,000
Non-Agency MBS          
Investments [Line Items]          
Par value of available for sale debt security 1,732,000   1,732,000   1,938,000
Investments, Unamortized Premium (Discount) (600,000)   (600,000)   (780,000)
Notional balance for interest only securities 9,577,721,000   9,577,721,000   9,799,629,000
Debt Securities, Available-for-sale, Amortized Cost 1,132,000   1,132,000   1,158,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 403,000   403,000   552,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (45,000)   (45,000)   (20,000)
Debt Securities, Available-for-sale 1,490,000   1,490,000   1,690,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 98,246,000   98,246,000   13,607,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss $ 1,926,000   $ 1,926,000   $ 146,000
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year 47   47   7
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value $ 107,000   $ 107,000   $ 1,099,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss $ 20,000   $ 20,000   $ 31,000
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year 4   4   5
Agency | Commercial Mortgage Backed Securities          
Investments [Line Items]          
Par value of available for sale debt security $ 655,935,000   $ 655,935,000   $ 1,890,186,000
Investments, Unamortized Premium (Discount) 6,518,000   6,518,000   15,414,000
Debt Securities, Available-for-sale, Amortized Cost 662,453,000   662,453,000   1,905,600,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 39,507,000   39,507,000   93,763,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (1,000)   (1,000)   (6,000)
Debt Securities, Available-for-sale 701,959,000   701,959,000   1,999,357,000
Proceeds from Sale of Available-for-sale Securities 2,020,228,000 213,198,000 2,193,912,000 213,198,000  
Debt Securities, Available-for-sale, Realized Loss 181,370,000 (6,493,000) 202,059,000 (6,493,000)  
Agency | Residential Mortgage Backed Securities          
Investments [Line Items]          
Par value of available for sale debt security 2,248,752,000   2,248,752,000   2,563,684,000
Investments, Unamortized Premium (Discount) 67,589,000   67,589,000   55,770,000
Debt Securities, Available-for-sale, Amortized Cost 2,316,341,000   2,316,341,000   2,619,454,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 40,465,000   40,465,000   69,082,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 0   0   (462,000)
Debt Securities, Available-for-sale 2,356,806,000   2,356,806,000   $ 2,688,074,000
Proceeds from Sale of Available-for-sale Securities 371,106,000 205,493,000 2,188,456,000 205,493,000  
Debt Securities, Available-for-sale, Realized Gain $ 11,729,000   $ 75,823,000    
Debt Securities, Available-for-sale, Realized Loss   (3,953,000)   (3,953,000)  
Agency | Interest-Only-Strip          
Investments [Line Items]          
Proceeds from Sale of Available-for-sale Securities   13,861,000   13,861,000  
Debt Securities, Available-for-sale, Realized Loss   $ 86,000   $ 86,000  
[1] The notional balance for Agency CMBS IO and non-Agency CMBS IO was $13,007,113 and $9,577,721 respectively, as of June 30, 2020.
[2] The notional balance for the Agency CMBS IO and non-Agency CMBS IO was $13,404,824 and $9,799,629, respectively, as of December 31, 2019.