Mortgage-Backed Securities | MORTGAGE-BACKED SECURITIES The following tables provide details on the Company’s MBS by investment type as of the dates indicated: June 30, 2022 December 31, 2021 Current Face Amortized Cost Fair Value Current Face Amortized Cost Fair Value Agency RMBS $ 2,478,879 $ 2,547,122 $ 2,219,619 $ 2,639,747 $ 2,713,907 $ 2,686,775 Agency CMBS 171,326 173,366 168,437 174,899 177,211 184,847 CMBS IO (1) n/a 275,185 270,717 n/a 298,197 309,419 Non-Agency other 759 656 613 966 777 798 Total $ 2,650,964 $ 2,996,329 $ 2,659,386 $ 2,815,612 $ 3,190,092 $ 3,181,839 (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. June 30, 2022 Amortized Cost Gross Unrealized Gain Gross Unrealized Loss Fair Value MBS measured at fair value through OCI: Agency RMBS $ 1,123,271 $ 22 $ (138,009) $ 985,284 Agency CMBS 173,366 66 (4,995) 168,437 CMBS IO 231,612 2,294 (4,856) 229,050 Non-Agency other 656 2 (45) 613 Total $ 1,528,905 $ 2,384 $ (147,905) $ 1,383,384 MBS measured at fair value through net income: Agency RMBS $ 1,423,851 $ — $ (189,516) $ 1,234,335 CMBS IO 43,573 39 (1,945) 41,667 Total $ 1,467,424 $ 39 $ (191,461) $ 1,276,002 December 31, 2021 Amortized Cost Gross Unrealized Gain Gross Unrealized Loss Fair Value MBS measured at fair value through OCI: Agency RMBS $ 1,232,738 $ 7,779 $ (19,994) $ 1,220,523 Agency CMBS 177,211 7,636 — 184,847 CMBS IO 276,354 11,713 (426) 287,641 Non-Agency other 777 63 (42) 798 Total $ 1,687,080 $ 27,191 $ (20,462) $ 1,693,809 MBS measured at fair value through net income: Agency RMBS $ 1,481,169 $ — $ (14,917) $ 1,466,252 CMBS IO 21,843 57 (122) 21,778 Total $ 1,503,012 $ 57 $ (15,039) $ 1,488,030 The majority of the Company’s MBS are pledged as collateral for the Company’s repurchase agreements, which are disclosed in Note 4 . Actual maturities of MBS are affected by the contractual lives of the underlying mortgage collateral, periodic payments of principal, prepayments of principal, and the payment priority structure of the security; therefore, actual maturities are generally shorter than the securities' stated contractual maturities. The following table presents information regarding unrealized gains and losses on investments reported within net income on the Company’s consolidated statements of comprehensive income for the periods indicated: Three Months Ended Six Months Ended June 30, June 30, 2022 2021 2022 2021 Agency RMBS $ (64,398) $ 981 $ (174,599) $ 21 CMBS IO (711) 16 (1,841) 16 Mortgage loans held for investment and other assets 6 87 86 67 Total unrealized (loss) gain on investments, net $ (65,103) $ 1,084 $ (176,354) $ 104 The following table presents information regarding realized gains and losses sales of investments reported in the Company’s consolidated statements of comprehensive income for the periods indicated: Three Months Ended Six Months Ended June 30, June 30, 2022 2021 2022 2021 Realized gains on sales of MBS - AFS $ — $ 2,767 $ — $ 7,516 Realized losses on sales of MBS - AFS — (759) — (811) Realized gains on sales of MBS - FVO — — — — Realized losses on sales of MBS - FVO (18,550) — (18,550) — Total realized (loss) gain on sale of investments, net $ (18,550) $ 2,008 $ (18,550) $ 6,705 The following table presents certain information for MBS designated as AFS that were in an unrealized loss position as of the dates indicated: June 30, 2022 December 31, 2021 Fair Value Gross Unrealized Losses # of Securities Fair Value Gross Unrealized Losses # of Securities Continuous unrealized loss position for less than 12 months: Agency MBS $ 863,130 $ (81,063) 75 $ 1,051,233 $ (20,118) 23 Non-Agency MBS 62,025 (1,573) 61 11,667 (247) 14 Continuous unrealized loss position for 12 months or longer: Agency MBS $ 386,087 $ (64,837) 8 $ — $ — — Non-Agency MBS 5,916 (432) 11 1,241 (97) 6 The unrealized losses on the Company’s MBS designated as AFS were the result of declines in market prices and were not credit related; therefore, the Company’s allowance for credit losses on its MBS was $0 as of June 30, 2022 and December 31, 2021. The principal related to Agency MBS is guaranteed by the GSEs Fannie Mae and |