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Mortgage-Backed Securities - Investment Type (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Debt Securities, Trading and Available-for-sale [Abstract]    
Investment Owned, Face Amount $ 2,650,964 $ 2,815,612
Debt Securities, Trading and Available-for-sale, Amortized Cost 2,996,329 3,190,092
Debt Securities, Trading and Available-for-sale 2,659,386 3,181,839
Amortized cost 1,528,905 1,687,080
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 2,384 27,191
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (147,905) (20,462)
Debt Securities, Available-for-sale 1,383,384 1,693,809
Debt Securities, Trading, Amortized Cost 1,467,424 1,503,012
Gross unrealized gain, investment, fair value option 39 57
Gross unrealized loss, investment, fair value option [Line Items] (191,461) (15,039)
Debt Securities, Trading 1,276,002 1,488,030
Residential Mortgage Backed Securities [Member]    
Debt Securities, Trading and Available-for-sale [Abstract]    
Investment Owned, Face Amount 2,478,879 2,639,747
Debt Securities, Trading and Available-for-sale, Amortized Cost 2,547,122 2,713,907
Debt Securities, Trading and Available-for-sale 2,219,619 2,686,775
Amortized cost 1,123,271 1,232,738
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 22 7,779
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (138,009) (19,994)
Debt Securities, Available-for-sale 985,284 1,220,523
Debt Securities, Trading, Amortized Cost 1,423,851 1,481,169
Gross unrealized gain, investment, fair value option 0 0
Gross unrealized loss, investment, fair value option [Line Items] (189,516) (14,917)
Debt Securities, Trading 1,234,335 1,466,252
Commercial Mortgage Backed Securities [Member]    
Debt Securities, Trading and Available-for-sale [Abstract]    
Investment Owned, Face Amount 171,326 174,899
Debt Securities, Trading and Available-for-sale, Amortized Cost 173,366 177,211
Debt Securities, Trading and Available-for-sale 168,437 184,847
Amortized cost 173,366 177,211
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 66 7,636
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (4,995) 0
Debt Securities, Available-for-sale 168,437 184,847
Interest-Only-Strip [Member]    
Debt Securities, Trading and Available-for-sale [Abstract]    
Debt Securities, Trading and Available-for-sale, Amortized Cost 275,185 298,197 [1]
Debt Securities, Trading and Available-for-sale [1] 270,717 309,419
Amortized cost 231,612 276,354
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 2,294 11,713
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (4,856) (426)
Debt Securities, Available-for-sale 229,050 287,641
Debt Securities, Trading, Amortized Cost 43,573 21,843
Gross unrealized gain, investment, fair value option 39 57
Gross unrealized loss, investment, fair value option [Line Items] (1,945) (122)
Debt Securities, Trading 41,667 21,778
Non-Agency MBS    
Debt Securities, Trading and Available-for-sale [Abstract]    
Investment Owned, Face Amount 759 966
Debt Securities, Trading and Available-for-sale, Amortized Cost 656 777
Debt Securities, Trading and Available-for-sale 613 798
Amortized cost 656 777
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 2 63
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (45) (42)
Debt Securities, Available-for-sale $ 613 $ 798
[1] (1) The notional balance for Agency CMBS IO and non-Agency CMBS IO was $10,438,417 and $7,540,114, respectively, as of June 30, 2022 and $10,630,713 and $8,635,666, respectively, as of December 31, 2021.