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Fair Value of Financial Instruments
 6 Months Ended
Jun. 30, 2025
Fair Value Disclosures [Abstract]  
Fair Value of Financial Instruments FAIR VALUE OF FINANCIAL INSTRUMENTS 
Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Fair value is based on the assumptions market participants would use when pricing an asset or liability and also considers all aspects of nonperformance risk, including the entity’s own credit standing, when measuring fair value of a liability. ASC Topic 820 established a valuation hierarchy of three levels as follows:

•Level 1 – Inputs are unadjusted, quoted prices in active markets for identical assets or liabilities as of the measurement date.
•Level 2 – Inputs include quoted prices in active markets for similar assets or liabilities; quoted prices in inactive markets for identical or similar assets or liabilities; or inputs either directly observable or indirectly observable through correlation with market data at the measurement date and for the duration of the instrument’s anticipated life.
•Level 3 – Unobservable inputs are supported by little or no market activity. The unobservable inputs represent management’s best estimate of how market participants would price the asset or liability at the measurement date. Consideration is given to the risk inherent in the valuation technique and the risk inherent in the inputs to the model.

The following table presents the Company’s financial instruments that are measured at fair value on the Company’s consolidated balance sheet by their valuation hierarchy levels as of the dates indicated:
($s in thousands)
June 30, 2025December 31, 2024
Total
Level 1Level 2Level 3
Total
Level 1Level 2Level 3
Assets:
   
MBS$10,510,006 $— $10,510,006 $— $7,512,087 $— $7,512,087 $— 
TBA securities (1)
30,823 — 30,823 — 133 — 133 — 
Interest rate swaptions
993 — 993 — — — — — 
Mortgage loans (2)
1,028 — — 1,028 1,130 — — 1,130 
Total assets carried at fair value
$10,542,850 $— $10,541,822 $1,028 $7,513,350 $— $7,512,220 $1,130 
Liabilities:
TBA securities (1)
$31 $— $31 $— $22,814 $— $22,814 $— 
Total liabilities carried at fair value
$31 $— $31 $— $22,814 $— $22,814 $— 
(1)TBA securities are reflected on consolidated balance sheets within “derivative assets” and “derivative liabilities” at their implied fair value, net of implied cost basis. Please refer to Note 5 for additional information.
(2)Mortgage loans are included within “other assets” on the consolidated balance sheets.
As of June 30, 2025, the fair value measurements for the Company’s TBA securities and its MBS are considered Level 2 because there are substantially similar securities actively trading or for which there has been recent trading activity in their respective markets. Fair value for Agency MBS and Agency RMBS TBA securities is based on prices received from an independent third-party pricing service. In valuing a security, the pricing service primarily uses a market approach, which uses observable prices and other relevant information that is generated by market transactions of identical or similar securities, but may use an income approach, which uses valuation techniques such as discounted cash flow modeling. Examples of the observable inputs and assumptions used in the valuation techniques include market interest rates, credit spreads, and projected prepayment speeds, among other things. The Company reviews the prices it receives from the pricing service for reasonableness using broker quotes as well as other third-party pricing services.
As of June 30, 2025, the Company's mortgage loans held for investment are single-family mortgage loans, which were originated or purchased by the Company prior to 2000, and for which the Company has elected the fair value option. The fair value measurements for these mortgage loans are considered Level 3 because there has been no recent trading activity of similar instruments upon which their fair value can be measured. The fair value for these Level 3 assets is measured by discounting the estimated future cash flows derived from cash flow models using certain inputs such as the security’s credit rating, coupon rate, estimated prepayment speeds, expected weighted average life, collateral composition, and expected credit losses as well as certain other relevant information. The Company used a constant prepayment rate assumption of 10%, default rate of 2%, loss severity of 20%, and a discount rate of 10% in measuring the fair value of its Level 3 assets as of June 30, 2025 and as of December 31, 2024.
The Company’s short positions in U.S. Treasury futures contracts are valued based on exchange pricing and are classified accordingly as Level 1 measurements. Interest rate swaps are valued using the daily settlement price, or fair value, determined by the clearing exchange based on a pricing model that references observable market inputs, including current benchmark rates and the forward yield curve, and thus their fair values are considered Level 2 measurements. The carrying value of the U.S. Treasury futures contracts and interest rate swaps on the Company’s consolidated balance sheets is $0 because the instruments require daily margin exchanges, which are
considered by the settlement agent to represent legal settlement of the contracts on a daily basis. Please see Note 1 and Note 5 for additional information regarding the fair value of the Company’s derivative instruments.
The fair value of interest rate swaptions is considered Level 2 because it is based on the fair value of the underlying interest rate swap and time remaining until its expiration and is carried on the balance sheet net of any deferred premium to be paid upon expiration or sale.
The table above excludes financial instruments reported at cost. As of June 30, 2025 and December 31, 2024, the cost of the Company’s repurchase agreements approximated fair value. Given their short-term nature (less than one year) and the interest rates on outstanding amounts, which largely correspond to prevailing rates observed in the repurchase agreement market, their inputs are considered Level 2.