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Fair Value Measurements
3 Months Ended
Mar. 31, 2024
Fair Value Disclosures [Abstract]  
Fair Value Measurements Fair Value Measurements
We use estimates of fair value in applying various accounting standards for our consolidated financial statements.

We categorize our fair value estimates based on a hierarchical framework associated with three levels of price transparency utilized in measuring financial instruments at fair value. For additional information regarding our policies for determining fair value and the hierarchical framework, see Notes to Consolidated Financial Statements, Note 2, “Significant Accounting Policies - Fair Value Measurement” in our 2023 Form 10-K.

During the three months ended March 31, 2024, there were no significant transfers of financial instruments between levels or changes in our methodology or assumptions used to value our financial instruments.

The following table summarizes the valuation of our financial instruments that are marked-to-fair value on a recurring basis.
 Fair Value Measurements on a Recurring Basis
 March 31, 2024December 31, 2023
(Dollars in thousands)Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total 
Assets:
Trading investments$— $— $58,166 $58,166 $— $— $54,481 $54,481 
Available-for-sale investments— 2,271,108 — 2,271,108 — 2,411,622 — 2,411,622 
Derivative instruments— 208 — 208 — — — — 
Total$— $2,271,316 $58,166 $2,329,482 $— $2,411,622 $54,481 $2,466,103 
Liabilities:
Derivative instruments$— $(116)$— $(116)$— $(370)$— $(370)
Total$— $(116)$— $(116)$— $(370)$— $(370)


Change in Balance Sheet Carrying Value Associated with Level 3 Financial Instruments Carried at Fair Value on a Recurring Basis

At March 31, 2024 and December 31, 2023, we had $58 million and $54 million, respectively, classified as level 3 financial instruments carried at fair value on a recurring basis through earnings which represent the five percent vertical risk retentions in the residual classes of Private Education Loans sold through securitizations. Total gains/(losses), net included in earnings were $2 million in net gains in the three months ended March 31, 2024, and in the year-ago period, recorded in the specified line item “gains/(losses) on sale of securities”. Net settlements in the three months ended March 31, 2024 were $2 million, compared to $(1) million in the year-ago period. There were no transfers into or out of level 3 related to these residual interest investments during the three months ended March 31, 2024 and 2023. The change in mark to market gains/(losses) on investments held as of the reporting date were $2 million in the three months ended March 31, 2024 and in the year-ago period.
The fair value at March 31, 2024 of the residual interests classified as level 3 valuations was $58 million. The residual interest investments are the projected future cash flows representing the difference between the securitized trust’s asset cash flows and the related outflows to the bondholders and for other fees. The residual investments are valued using an internal discounted cash flow model to arrive at the net present value of expected trust residual distributions. These instruments are not actively traded, nor do they have quoted market prices. As a result, unobservable model input assumptions are made regarding the expected CPR and the probability of defaults of the loans in the securitization trusts. At March 31, 2024, the range (average by volume) of the CPR input was 7.1 percent to 11.1 percent (average of 8.49 percent) and the range of the defaults input was 5.1 percent to 20.7 percent (average of 11.03 percent).
The significant inputs considered unobservable detailed above would be expected to have the following impacts to the valuations:
A decrease in CPR would result in a longer weighted average life of the trust, resulting in a decrease to the valuation due to the delay in residual cash flows with the increased term. The opposite is true for an increase in the CPR.
A decrease in the probability of defaults means increased principal receipts, resulting in an increase to the valuation due to the increase in residual cash flow.
Conversely, an increase in the probability of defaults means decreased principal receipts, resulting in a decrease to the valuation due to the decrease in residual cash flow.

The following table summarizes the fair values of our financial assets and liabilities, including derivative financial instruments.
 March 31, 2024December 31, 2023
(Dollars in thousands)Fair
Value
Carrying
Value
DifferenceFair
Value
Carrying
Value
Difference
Earning assets:
Loans held for investment, net:
Private Education Loans$22,342,438 $19,687,783 $2,654,655 $22,229,045 $19,772,293 $2,456,752 
FFELP Loans521,527 513,006 8,521 542,775 534,064 8,711 
Cash and cash equivalents3,584,013 3,584,013 — 4,149,838 4,149,838 — 
Trading investments58,166 58,166 — 54,481 54,481 — 
Available-for-sale investments2,271,108 2,271,108 — 2,411,622 2,411,622 — 
Accrued interest receivable1,467,249 1,386,487 80,762 1,448,766 1,379,904 68,862 
Tax indemnification receivable— — — — — — 
Derivative instruments208 208 — — — — 
Total earning assets$30,244,709 $27,500,771 $2,743,938 $30,836,527 $28,302,202 $2,534,325 
Interest-bearing liabilities:
Money-market and savings accounts$10,268,578 $10,417,629 $149,051 $11,134,883 $11,203,292 $68,409 
Certificates of deposit10,431,342 10,483,580 52,238 10,380,684 10,448,365 67,681 
Long-term borrowings4,703,196 4,976,882 273,686 4,873,690 5,227,512 353,822 
Accrued interest payable89,328 89,328 — 105,066 105,066 — 
Derivative instruments116 116 — 370 370 — 
Total interest-bearing liabilities$25,492,560 $25,967,535 $474,975 $26,494,693 $26,984,605 $489,912 
Excess of net asset fair value over carrying value$3,218,913 $3,024,237 

Please refer to Notes to Consolidated Financial Statements, Note 17, “Fair Value Measurements” in our 2023 Form 10-K for a full discussion of the methods and assumptions used to estimate the fair value of each class of financial instruments.