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Investment Securities Available for Sale, at Fair Value
9 Months Ended
Sep. 30, 2021
Investments, Debt and Equity Securities [Abstract]  
Investment Securities Available for Sale, at Fair Value Investment Securities Available for Sale, at Fair Value
The Company accounts for certain of its investment securities available for sale using the fair value election pursuant to ASC 825, Financial Instruments ("ASC 825"), where changes in fair value are recorded in unrealized gains (losses), net on the Company's condensed consolidated statements of operations. The Company also has investment securities available for sale where the fair value option has not been elected, which we refer to as CECL Securities. CECL Securities are reported at fair value with unrealized gains and losses recorded in other comprehensive income (loss) on the Company's condensed consolidated statements of comprehensive income. The Company's investment securities available for sale consisted of the following as of September 30, 2021 and December 31, 2020, respectively (dollar amounts in thousands):

 September 30, 2021December 31, 2020
Amortized CostUnrealizedFair ValueAmortized CostUnrealizedFair Value
 GainsLossesGainsLosses
Fair Value Option
Agency RMBS$129,198 $— $(3,609)$125,589 $138,541 $854 $— $139,395 
Non-Agency RMBS (1)
108,579 1,168 (3,064)106,683 100,465 170 (10,786)89,849 
CMBS32,600 1,139 — 33,739 139,019 5,685 (3,731)140,973 
ABS
24,343 17,142 — 41,485 34,139 9,086 — 43,225 
Total investment securities available for sale - fair value option
294,720 19,449 (6,673)307,496 412,164 15,795 (14,517)413,442 
CECL Securities
Non-Agency RMBS (2)
115,686 2,482 (75)118,093 266,855 4,336 (5,374)265,817 
CMBS22,869 — (365)22,504 43,435 2,032 — 45,467 
Total investment securities available for sale - CECL Securities
138,555 2,482 (440)140,597 310,290 6,368 (5,374)311,284 
Total
$433,275 $21,931 $(7,113)$448,093 $722,454 $22,163 $(19,891)$724,726 

(1)Includes non-Agency RMBS held in a securitization trust with a total fair value of $37.6 million as of December 31, 2020. During the nine months ended September 30, 2021, the Company exercised its right to an optional redemption of its non-Agency RMBS re-securitization, returning the non-Agency RMBS held by the re-securitization trust to the Company (see Note 7).
(2)Includes non-Agency RMBS held in a securitization trust with a total fair value of $71.5 million as of December 31, 2020. During the nine months ended September 30, 2021, the Company exercised its right to an optional redemption of its non-Agency RMBS re-securitization, returning the non-Agency RMBS held by the re-securitization trust to the Company (see Note 7).
    
Accrued interest receivable for all investment securities available for sale in the amount of $1.0 million and $2.4 million as of September 30, 2021 and December 31, 2020, respectively, is included in other assets on the Company's condensed consolidated balance sheets.
Realized Gain and Loss Activity

The following tables summarize our investment securities sold during the three months ended September 30, 2021 and 2020, respectively (dollar amounts in thousands):

Three Months Ended September 30, 2021
Sales Proceeds Realized GainsRealized LossesNet Realized Gains (Losses)
Non-Agency RMBS$43,579 $4,841 $— $4,841 
CMBS89,481 5,496 (452)5,044 
Total $133,060 $10,337 $(452)$9,885 


Three Months Ended September 30, 2020
Sales Proceeds Realized GainsRealized LossesNet Realized Gains (Losses)
Non-Agency RMBS$259,493 $141 $(8,860)$(8,719)
CMBS110,680 6,849 (705)6,144 
Total $370,173 $6,990 $(9,565)$(2,575)


The following tables summarize our investment securities sold during the nine months ended September 30, 2021 and 2020, respectively (dollar amounts in thousands):

Nine Months Ended September 30, 2021
Sales Proceeds Realized GainsRealized LossesNet Realized Gains (Losses)
Non-Agency RMBS (1)
$115,662 $4,853 $(833)$4,020 
CMBS132,796 11,083 (452)10,631 
Total $248,458 $15,936 $(1,285)$14,651 


Nine Months Ended September 30, 2020
Sales Proceeds Realized GainsRealized LossesNet Realized Gains (Losses)
Agency RMBS:
Agency ARMs$49,892 $44 $(4,157)$(4,113)
Agency Fixed-Rate (1)
943,074 5,358 (11,697)(6,339)
Total Agency RMBS992,966 5,402 (15,854)(10,452)
Agency CMBS (2)
145,411 5,666 (209)5,457 
Total Agency1,138,377 11,068 (16,063)(4,995)
Non-Agency RMBS428,251 435 (34,681)(34,246)
CMBS248,741 8,176 (30,289)(22,113)
Total $1,815,369 $19,679 $(81,033)$(61,354)

(1)Includes Agency RMBS securities issued by Consolidated SLST (see Note 7).
(2)Includes Agency CMBS securities transferred from the Consolidated K-Series (see Note 7).

The Company recognized a write-down of fair value option non-Agency RMBS IOs for a realized loss of $4.8 million for the three and nine months ended September 30, 2021.
Weighted Average Life

Actual maturities of our investment securities available for sale are generally shorter than stated contractual maturities (with contractual maturities up to 38 years), as they are affected by periodic payments and prepayments of principal on the underlying mortgages. As of September 30, 2021 and December 31, 2020, based on management’s estimates, the weighted average life of the Company’s investment securities available for sale portfolio was approximately 5.4 years and 5.6 years, respectively.

The following table sets forth the weighted average lives of our investment securities available for sale as of September 30, 2021 and December 31, 2020, respectively (dollar amounts in thousands):
Weighted Average LifeSeptember 30, 2021December 31, 2020
0 to 5 years$223,991 $332,934 
Over 5 to 10 years206,360 320,361 
10+ years17,742 71,431 
Total$448,093 $724,726 

Unrealized Losses in Other Comprehensive Income

The Company evaluated its CECL Securities that were in an unrealized loss position as of September 30, 2021 and December 31, 2020, respectively, and determined that no allowance for credit losses was necessary. The Company did not recognize credit losses for its CECL Securities through earnings for the three and nine months ended September 30, 2021 and 2020.

The following table presents the Company's CECL Securities in an unrealized loss position with no credit losses reported, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position as of September 30, 2021 and December 31, 2020, respectively (dollar amounts in thousands):

September 30, 2021Less than 12 monthsGreater than 12 monthsTotal
Carrying
Value
Gross
Unrealized
Losses
Carrying
Value
Gross
Unrealized
Losses
Carrying
Value
Gross
Unrealized
Losses
Non-Agency RMBS$35,532 $(22)$36,739 $(53)$72,271 $(75)
CMBS
22,504 (365)— — 22,504 (365)
Total
$58,036 $(387)$36,739 $(53)$94,775 $(440)

December 31, 2020Less than 12 monthsGreater than 12 monthsTotal
 Carrying
Value
Gross
Unrealized
Losses
Carrying
Value
Gross
Unrealized
Losses
Carrying
Value
Gross
Unrealized
Losses
Non-Agency RMBS$159,841 $(4,526)$8,234 $(848)$168,075 $(5,374)
Total $159,841 $(4,526)$8,234 $(848)$168,075 $(5,374)

At September 30, 2021, the Company did not intend to sell any of its investment securities available for sale that were in an unrealized loss position, and it was “more likely than not” that the Company would not be required to sell these securities before recovery of their amortized cost basis, which may be at their maturity.
Gross unrealized losses in other comprehensive income on the Company's non-Agency RMBS and CMBS were $0.4 million at September 30, 2021. Credit risk associated with non-Agency RMBS and CMBS is regularly assessed as new information regarding the underlying collateral becomes available and based on updated estimates of cash flows generated by the underlying collateral. In performing its assessment, the Company considers past and expected future performance of the underlying collateral, including timing of expected future cash flows, prepayment rates, default rates, loss severities, delinquency rates, current levels of subordination, volatility of the security's fair value, temporary declines in liquidity for the asset class and interest rate changes since purchase. Based upon the most recent evaluation, the Company does not believe that these unrealized losses are credit related but are rather a reflection of current market yields and/or marketplace bid-ask spreads.