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Mortgage-Backed Securities - Investment Type (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Debt Securities, Trading and Available-for-sale [Abstract]    
Investment Owned, Face Amount $ 3,301,343 $ 2,815,612
Debt Securities, Trading and Available-for-sale, Amortized Cost 3,607,545 3,190,092
Debt Securities, Trading and Available-for-sale 3,150,306 3,181,839
Amortized cost 1,336,727 1,687,080
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 288 27,191
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (196,917) (20,462)
Debt Securities, Available-for-sale 1,140,098 1,693,809
Debt Securities, Trading, Amortized Cost 2,270,818 1,503,012
Gross unrealized gain, investment, fair value option 0 57
Gross unrealized loss, investment, fair value option (260,610) (15,039)
Debt Securities, Trading 2,010,208 1,488,030
Residential Mortgage Backed Securities [Member]    
Debt Securities, Trading and Available-for-sale [Abstract]    
Investment Owned, Face Amount 3,164,044 2,639,747
Debt Securities, Trading and Available-for-sale, Amortized Cost 3,211,908 2,713,907
Debt Securities, Trading and Available-for-sale 2,776,569 2,686,775
Amortized cost 1,002,705 1,232,738
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 0 7,779
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (180,099) (19,994)
Debt Securities, Available-for-sale 822,606 1,220,523
Debt Securities, Trading, Amortized Cost 2,209,203 1,481,169
Gross unrealized gain, investment, fair value option 0 0
Gross unrealized loss, investment, fair value option (255,240) (14,917)
Debt Securities, Trading 1,953,963 1,466,252
Commercial Mortgage Backed Securities [Member]    
Debt Securities, Trading and Available-for-sale [Abstract]    
Investment Owned, Face Amount 137,067 174,899
Debt Securities, Trading and Available-for-sale, Amortized Cost 137,987  
Debt Securities, Trading and Available-for-sale 130,384  
Amortized cost 122,678 177,211
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 0 7,636
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (6,171) 0
Debt Securities, Available-for-sale 116,507 184,847
Debt Securities, Trading, Amortized Cost 15,309  
Gross unrealized gain, investment, fair value option 0  
Gross unrealized loss, investment, fair value option (1,432)  
Debt Securities, Trading 13,877  
Interest-Only-Strip [Member]    
Debt Securities, Trading and Available-for-sale [Abstract]    
Debt Securities, Trading and Available-for-sale, Amortized Cost [1] 257,418 298,197
Debt Securities, Trading and Available-for-sale [1] 243,171 309,419
Amortized cost 211,112 276,354
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 288 11,713
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (10,597) (426)
Debt Securities, Available-for-sale 200,803 287,641
Debt Securities, Trading, Amortized Cost 46,306 21,843
Gross unrealized gain, investment, fair value option 0 57
Gross unrealized loss, investment, fair value option (3,938) (122)
Debt Securities, Trading 42,368 21,778
Interest-Only-Strip, Agency CMBS [Member]    
Debt Securities, Trading and Available-for-sale [Abstract]    
Notional balance 9,986,364 10,630,713
Interest-Only-Strip, Non-Agency CMBS [Member]    
Debt Securities, Trading and Available-for-sale [Abstract]    
Notional balance 6,594,280 8,635,666
Non-Agency MBS    
Debt Securities, Trading and Available-for-sale [Abstract]    
Investment Owned, Face Amount 232 966
Amortized cost 232 777
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 0 63
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (50) (42)
Debt Securities, Available-for-sale $ 182 $ 798
[1] (1) The notional balance for Agency CMBS IO and non-Agency CMBS IO was $9,986,364 and $6,594,280, respectively, as of September 30, 2022, and $10,630,713 and $8,635,666, respectively, as of December 31, 2021.