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Mortgage-Backed Securities (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
plantiff
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
plantiff
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
plantiff
Investments [Line Items]          
Par value of available for sale debt security $ 1,458,293,000   $ 1,458,293,000   $ 2,076,346,000
Investments, Unamortized Premium (Discount) 344,027,000   344,027,000   439,648,000
Debt Securities, Available-for-sale, Amortized Cost 1,802,320,000   1,802,320,000   2,515,994,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 34,317,000   34,317,000   81,293,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (14,081,000)   (14,081,000)   (1,032,000)
Debt Securities, Available-for-sale 1,822,556,000   1,822,556,000   2,596,255,000
Par Value of Debt Security, Fair Value Option Elected 1,000,854,000   1,000,854,000    
Debt Securities, Trading, Amortized Cost 1,038,700,000   1,038,700,000    
Debt Securities, Trading, Unrealized Gain     69,000    
Debt Securities, Trading, Unrealized Loss     (3,159,000)    
Debt Securities, Trading 1,035,610,000   1,035,610,000    
Debt Securities, Trading and Available-for-sale 2,858,166,000   2,858,166,000    
Proceeds Received 0 $ 403,095,000 325,282,000 $ 4,403,054,000  
Realized Gain (Loss) 0 20,846,000 6,705,000 298,728,000  
Debt Securities, Available-for-sale, Allowance for Credit Loss 0   0    
Fair Value Option          
Investments [Line Items]          
Investments, Unamortized Premium (Discount) 37,846,000   37,846,000    
Residential Mortgage Backed Securities          
Investments [Line Items]          
Par value of available for sale debt security         1,839,046,000
Investments, Unamortized Premium (Discount)         57,997,000
Debt Securities, Available-for-sale, Amortized Cost         1,897,043,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax         49,348,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax         0
Debt Securities, Available-for-sale         1,946,391,000
Residential Mortgage Backed Securities | Agency MBS          
Investments [Line Items]          
Par value of available for sale debt security 1,271,603,000   1,271,603,000    
Investments, Unamortized Premium (Discount) 41,604,000   41,604,000    
Debt Securities, Available-for-sale, Amortized Cost 1,313,207,000   1,313,207,000    
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 10,056,000   10,056,000    
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (13,348,000)   (13,348,000)    
Debt Securities, Available-for-sale 1,309,915,000   1,309,915,000   1,946,391,000
Par Value of Debt Security, Fair Value Option Elected 1,000,854,000   1,000,854,000    
Debt Securities, Trading, Amortized Cost 1,034,387,000   1,034,387,000    
Debt Securities, Trading, Unrealized Gain     52,000    
Debt Securities, Trading, Unrealized Loss     (3,132,000)    
Debt Securities, Trading 1,031,307,000   1,031,307,000    
Debt Securities, Trading and Available-for-sale 2,341,222,000   2,341,222,000    
Proceeds Received 0 0 287,409,000 2,187,956,000  
Realized Gain (Loss) 0 1,000 3,938,000 75,824,000  
Residential Mortgage Backed Securities | Agency MBS | Fair Value Option          
Investments [Line Items]          
Investments, Unamortized Premium (Discount) 33,533,000   33,533,000    
Commercial Mortgage Backed Securities          
Investments [Line Items]          
Investments, Unamortized Premium (Discount)         3,152,000
Debt Securities, Available-for-sale, Amortized Cost         238,953,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax         19,597,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax         0
Debt Securities, Available-for-sale         258,550,000
Proceeds Received 0   37,873,000    
Realized Gain (Loss) 0   2,767,000    
Commercial Mortgage Backed Securities | Agency MBS          
Investments [Line Items]          
Par value of available for sale debt security 185,603,000   185,603,000   235,801,000
Investments, Unamortized Premium (Discount) 2,608,000   2,608,000    
Debt Securities, Available-for-sale, Amortized Cost 188,211,000   188,211,000    
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 10,230,000   10,230,000    
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (7,000)   (7,000)    
Debt Securities, Available-for-sale 198,434,000   198,434,000   258,550,000
Debt Securities, Trading and Available-for-sale 198,434,000   198,434,000    
Proceeds Received   403,095,000   2,215,098,000  
Realized Gain (Loss)   $ (20,845,000)   $ 222,904,000  
Interest-Only-Strip          
Investments [Line Items]          
Par value of available for sale debt security 0 [1]   0 [1]   0 [2]
Investments, Unamortized Premium (Discount) 300,061,000   300,061,000   378,939,000
Debt Securities, Available-for-sale, Amortized Cost 300,061,000   300,061,000   378,939,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 13,924,000   13,924,000   12,081,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (684,000)   (684,000)   (981,000)
Debt Securities, Available-for-sale 313,301,000   313,301,000   390,039,000
Debt Securities, Trading, Amortized Cost 4,313,000   4,313,000    
Debt Securities, Trading, Unrealized Gain     17,000    
Debt Securities, Trading, Unrealized Loss     (27,000)    
Debt Securities, Trading 4,303,000   4,303,000    
Debt Securities, Trading and Available-for-sale 317,604,000   317,604,000    
Interest-Only-Strip | Fair Value Option          
Investments [Line Items]          
Investments, Unamortized Premium (Discount) 4,313,000   4,313,000    
Par Value of Debt Security, Fair Value Option Elected 0   0    
Non-Agency MBS          
Investments [Line Items]          
Par value of available for sale debt security 1,087,000   1,087,000   1,499,000
Investments, Unamortized Premium (Discount) (246,000)   (246,000)   (440,000)
Debt Securities, Available-for-sale, Amortized Cost 841,000   841,000   1,059,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 107,000   107,000   267,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (42,000)   (42,000)   (51,000)
Debt Securities, Available-for-sale 906,000   906,000   1,275,000
Debt Securities, Trading and Available-for-sale 906,000   906,000    
Notional balance for interest only securities 8,865,021,000   8,865,021,000   9,319,520,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 10,153,000   10,153,000   33,417,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 2,771,000   2,771,000   2,156,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (159,000)   (159,000)   (408,000)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss $ (159,000)   $ (159,000)   $ (93,000)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions 12   12   23
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | plantiff 7   7   5
Agency MBS          
Investments [Line Items]          
Notional balance for interest only securities $ 10,508,786,000   $ 10,508,786,000   $ 11,277,908,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 1,121,823,000   1,121,823,000   19,266,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 24,000   24,000   749,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (13,738,000)   (13,738,000)   (399,000)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss $ (26,000)   $ (26,000)   $ (133,000)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions | plantiff 23   23   19
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions 1   1   2
[1] The notional balance for Agency CMBS IO and non-Agency CMBS IO was $10,508,786 and $8,865,021 respectively, as of September 30, 2021.
[2] The notional balance for the Agency CMBS IO and non-Agency CMBS IO was $11,277,908 and $9,319,520, respectively, as of December 31, 2020.