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Mortgage-Backed Securities (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Investments [Line Items]          
Debt Securities, Trading, Amortized Cost $ 1,048,149,000   $ 1,048,149,000    
Debt Securities, Trading, Unrealized Gain     467,000    
Debt Securities, Trading, Unrealized Loss     (430,000)    
Debt Securities, Trading 1,048,186,000   1,048,186,000    
Debt Securities, Trading and Available-for-sale 2,995,502,000   2,995,502,000    
Proceeds from Sale of Available-for-sale Securities 250,453,000 $ 2,391,334,000 325,282,000 $ 4,382,368,000  
Debt Securities, Available-for-sale, Realized Gain (Loss) 2,008,000 193,099,000 6,705,000 277,882,000  
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year         2
Debt Securities, Available-for-sale, Allowance for Credit Loss 0   0    
Par value of available for sale debt security 1,544,607,000   1,544,607,000   $ 2,076,346,000
Debt Securities, Available-for-sale, Amortized Cost 1,917,942,000   1,917,942,000   2,515,995,000
Debt Securities, Available-for-sale 1,947,316,000   1,947,316,000   2,596,255,000
Par Value of Debt Security, Fair Value Option Elected 1,013,404,000   1,013,404,000    
Investments, Unamortized Premium (Discount) 373,335,000   373,335,000   439,649,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 38,629,000   38,629,000   81,293,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (9,255,000)   (9,255,000)   (1,033,000)
Fair Value Option          
Investments [Line Items]          
Investments, Unamortized Premium (Discount) 34,745,000   34,745,000    
Residential Mortgage Backed Securities          
Investments [Line Items]          
Par value of available for sale debt security         1,839,046,000
Debt Securities, Available-for-sale, Amortized Cost         1,897,043,000
Debt Securities, Available-for-sale         1,946,391,000
Investments, Unamortized Premium (Discount)         57,997,000
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
Residential Mortgage Backed Securities | Agency MBS          
Investments [Line Items]          
Debt Securities, Trading, Amortized Cost 1,047,623,000   1,047,623,000    
Debt Securities, Trading, Unrealized Gain     451,000    
Debt Securities, Trading, Unrealized Loss     (430,000)    
Debt Securities, Trading 1,047,644,000   1,047,644,000    
Debt Securities, Trading and Available-for-sale 2,440,908,000   2,440,908,000    
Proceeds from Sale of Available-for-sale Securities 212,580,000 371,106,000 287,409,000 2,188,456,000  
Debt Securities, Available-for-sale, Realized Gain   11,729,000 3,938,000 75,823,000  
Debt Securities, Available-for-sale, Realized Loss 759,000        
Par value of available for sale debt security 1,347,318,000   1,347,318,000    
Debt Securities, Available-for-sale, Amortized Cost 1,391,662,000   1,391,662,000    
Debt Securities, Available-for-sale 1,393,264,000   1,393,264,000   1,946,391,000
Par Value of Debt Security, Fair Value Option Elected 1,013,404,000   1,013,404,000    
Investments, Unamortized Premium (Discount) 44,344,000   44,344,000    
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 10,022,000   10,022,000    
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (8,420,000)   (8,420,000)    
Residential Mortgage Backed Securities | Agency MBS | Fair Value Option          
Investments [Line Items]          
Investments, Unamortized Premium (Discount) 34,219,000   34,219,000    
Commercial Mortgage Backed Securities          
Investments [Line Items]          
Proceeds from Sale of Available-for-sale Securities 37,873,000   37,873,000    
Debt Securities, Available-for-sale, Realized Loss 2,767,000   2,767,000    
Debt Securities, Available-for-sale, Amortized Cost         238,953,000
Debt Securities, Available-for-sale         258,550,000
Investments, Unamortized Premium (Discount)         3,152,000
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
Commercial Mortgage Backed Securities | Agency MBS          
Investments [Line Items]          
Debt Securities, Trading and Available-for-sale 211,110,000   211,110,000    
Proceeds from Sale of Available-for-sale Securities   2,020,228,000   2,193,912,000  
Debt Securities, Available-for-sale, Realized Loss   $ 181,370,000   $ 202,059,000  
Par value of available for sale debt security 196,093,000   196,093,000   235,801,000
Debt Securities, Available-for-sale, Amortized Cost 198,818,000   198,818,000    
Debt Securities, Available-for-sale 211,110,000   211,110,000   258,550,000
Investments, Unamortized Premium (Discount) 2,725,000   2,725,000    
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 12,300,000   12,300,000    
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (8,000)   (8,000)    
Interest-Only-Strip          
Investments [Line Items]          
Debt Securities, Trading, Amortized Cost 526,000   526,000    
Debt Securities, Trading, Unrealized Gain     16,000    
Debt Securities, Trading, Unrealized Loss     0    
Debt Securities, Trading 542,000   542,000    
Debt Securities, Trading and Available-for-sale 342,483,000   342,483,000    
Par value of available for sale debt security 0 [1]   0 [1]   0 [2]
Debt Securities, Available-for-sale, Amortized Cost 326,572,000   326,572,000   378,940,000
Debt Securities, Available-for-sale 341,941,000   341,941,000   390,039,000
Investments, Unamortized Premium (Discount) 326,572,000   326,572,000   378,940,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 16,155,000   16,155,000   12,081,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (786,000)   (786,000)   (982,000)
Interest-Only-Strip | Fair Value Option          
Investments [Line Items]          
Par Value of Debt Security, Fair Value Option Elected 0   0    
Investments, Unamortized Premium (Discount) 526,000   526,000    
Non-Agency MBS          
Investments [Line Items]          
Notional balance for interest only securities 8,984,509,000   8,984,509,000   9,319,520,000
Debt Securities, Trading and Available-for-sale 1,001,000   1,001,000    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 4,996,000   4,996,000   33,417,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss $ 203,000   $ 203,000   $ 408,000
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year 5   5   23
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value $ 3,333,000   $ 3,333,000   $ 2,156,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss $ 149,000   $ 149,000   $ 93,000
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year 7   7   5
Par value of available for sale debt security $ 1,196,000   $ 1,196,000   $ 1,499,000
Debt Securities, Available-for-sale, Amortized Cost 890,000   890,000   1,059,000
Debt Securities, Available-for-sale 1,001,000   1,001,000   1,275,000
Investments, Unamortized Premium (Discount) (306,000)   (306,000)   (440,000)
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 152,000   152,000   267,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (41,000)   (41,000)   (51,000)
Agency MBS          
Investments [Line Items]          
Notional balance for interest only securities 10,868,346,000   10,868,346,000   11,277,908,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 1,961,980,000   1,961,980,000   19,266,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss $ 9,212,000   $ 9,212,000   $ 399,000
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year 34   34   19
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value $ 324,000   $ 324,000   $ 749,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss $ 121,000   $ 121,000   $ 133,000
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year 5   5    
[1] The notional balance for Agency CMBS IO and non-Agency CMBS IO was $10,868,346 and $8,984,509 respectively, as of June 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.