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Borrowings (Tables)
12 Months Ended
Dec. 31, 2023
Debt Disclosure [Abstract]  
Schedule of Secured Borrowings The following table summarizes our secured borrowings at December 31, 2023 and 2022.
As of December 31,
(dollars in thousands)
20232022
Short-TermLong-TermTotalShort-TermLong-TermTotal
Unsecured borrowings:
Unsecured debt (fixed-rate)$— $992,200 $992,200 $— $988,986 $988,986 
Total unsecured borrowings— 992,200 992,200 — 988,986 988,986 
Secured borrowings:
Private Education Loan term securitizations:
Fixed-rate— 3,585,254 3,585,254 — 3,462,363 3,462,363 
Variable-rate— 650,058 650,058 — 783,765 783,765 
Total Private Education Loan term securitizations— 4,235,312 4,235,312 — 4,246,128 4,246,128 
Secured Borrowing Facility— — — — — — 
Total secured borrowings— 4,235,312 4,235,312 — 4,246,128 4,246,128 
Total $— $5,227,512 $5,227,512 $— $5,235,114 $5,235,114 
Schedule of Long-term Borrowings
The following table summarizes the outstanding long-term borrowings, the weighted average interest rates at the end of the period and the related average balance during the period. Rates reflect stated interest of borrowings and related discounts and premiums. The long-term borrowings amortize over time and mature serially from 2025 to 2053.

December 31, 2023Year Ended
December 31, 2023
December 31, 2022Year Ended
December 31, 2022
(Dollars in thousands)Ending BalanceWeighted Average
Interest Rate
Average BalanceEnding BalanceWeighted Average
Interest Rate
Average Balance
Long-term borrowings:
Floating-rate borrowings$650,058 6.51 %$715,409 $783,765 5.26 %$898,002 
Fixed-rate borrowings4,577,454 3.52 4,605,806 4,451,349 2.93 4,571,690 
Total long-term borrowings$5,227,512 3.89 %$5,321,215 $5,235,114 3.28 %$5,469,692 
Schedule of Maturities of Long-term Debt
As of December 31, 2023, the maturities of our brokered CDs and borrowings are summarized below.

As of December 31, 2023
(dollars in thousands)
Brokered CDsUnsecured
Debt
Secured Borrowings(1)
Total
2024$2,385,510 $— $721,038 $3,106,548 
20252,768,889 497,567 710,111 3,976,567 
20261,832,740 494,633 663,588 2,990,961 
2027151,131 — 592,381 743,512 
2028146,459 — 496,386 642,845 
2029 and after— — 1,051,808 1,051,808 
7,284,729 992,200 4,235,312 12,512,241 
Hedge accounting adjustments(1,306)— — (1,306)
Total$7,283,423 $992,200 $4,235,312 $12,510,935 
(1) We view our secured borrowings as long-term based on the contractual maturity dates ranging from 2031 to 2053. However, the actual maturity of our secured borrowings depends on the prepayment speeds of the underlying collateralized loans. To disclose how we expect this debt to pay down over time, the maturities for our secured borrowings are based on the projected bond principal paydowns using the current estimated loan prepayment speeds.
Schedule of Securities Financing Transactions
Secured Financings
The following summarizes our secured financings issued in 2022 and 2023:

IssueDate IssuedTotal Issued
Weighted Average
Cost of Funds(1)
Weighted Average Life
(in years)
(Dollars in thousands)
Private Education Loans:
2022-CAugust 2022575,000 
SOFR plus 1.76%
4.69
Total notes issued in 2022$575,000 
Total loan and accrued interest amount securitized at inception in 2022(2)
$674,387 
2023-AMarch 2023$579,000 
SOFR plus 1.53%
5.06
2023-CAugust 2023$568,000 
SOFR plus 1.69%
4.93
Total notes issued in 2023$1,147,000 
Total loan and accrued interest amount securitized at inception in 2023(3)
$1,292,507 
(1) Represents SOFR equivalent cost of funds for floating and fixed-rate bonds, excluding issuance costs.
(2) At December 31, 2023, $543 million of our Private Education Loans, including $513 million of principal and $30 million in capitalized interest, were encumbered related to these transactions.
(3) At December 31, 2023, $1.21 billion of our Private Education Loans, including $1.13 billion of principal and $81 million in capitalized interest, were encumbered related to these transactions.
Schedule of Variable Interest Entities We consolidate our financing entities that are VIEs as a result of our being the entities’ primary beneficiary. As a result, these financing VIEs are accounted for as secured borrowings.
As of December 31, 2023
(dollars in thousands)
Debt OutstandingCarrying Amount of Assets Securing Debt Outstanding
Short-TermLong-TermTotalLoansRestricted Cash
Other Assets(1)
Total
Secured borrowings:
Private Education Loan term securitizations$— $4,235,312 $4,235,312 $5,539,964 $149,412 $311,697 $6,001,073 
Secured Borrowing Facility— — — — — 1,066 1,066 
Total$— $4,235,312 $4,235,312 $5,539,964 $149,412 $312,763 $6,002,139 
    
As of December 31, 2022
(dollars in thousands)
Debt OutstandingCarrying Amount of Assets Securing Debt Outstanding
Short-TermLong-TermTotalLoansRestricted Cash
Other Assets(1)
Total
Secured borrowings:
Private Education Loan term securitizations$— $4,246,128 $4,246,128 $5,433,602 $156,719 $286,093 $5,876,414 
Secured Borrowing Facility— — — — — 1,066 1,066 
Total$— $4,246,128 $4,246,128 $5,433,602 $156,719 $287,159 $5,877,480 
(1) Other assets primarily represent accrued interest receivable.
The table below provides a summary of our exposure related to our unconsolidated VIEs.
20232022
As of December 31,
(dollars in thousands)
Debt Interests(1)
Equity Interests(2)
Total Exposure
Debt Interests(1)
Equity Interests(2)
Total Exposure
Private Education Loan term securitizations$423,327 $54,481 $477,808 $329,188 $50,786 $379,974 
(1) Vertical risk retention interest classified as available-for-sale investment.
(2) Vertical risk retention interest classified as trading investment.