XML 90 R79.htm IDEA: XBRL DOCUMENT v3.25.3
Fair Value Measurements - Fair Values of Financial Assets and Liabilities, Including Derivative Financial Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Earning assets:    
Trading investments $ 51,963 $ 53,262
Accrued interest receivable, difference 115,532 116,884
Derivative instruments 0 0
Total earning assets, difference 3,259,634 3,325,107
Interest-bearing liabilities:    
Long-term borrowings, difference 10,081 116,961
Derivative instruments 30 40
Total interest-bearing liabilities, difference (45,697) 86,316
Excess of net asset fair value over carrying value 3,213,937 3,411,423
Money-market and savings accounts    
Interest-bearing liabilities:    
Deposits, difference (7,656) 22,593
Certificates of deposit    
Interest-bearing liabilities:    
Deposits, difference (48,122) (53,238)
Fair Value    
Earning assets:    
Cash and cash equivalents 3,539,341 4,700,366
Trading investments 51,963 53,262
Available-for-sale investments 1,775,784 1,933,226
Accrued interest receivable 1,805,634 1,663,474
Derivative instruments 3 0
Total earning assets 31,931,894 32,460,709
Interest-bearing liabilities:    
Long-term borrowings 6,828,914 6,323,384
Accrued interest payable 77,128 108,488
Derivative instruments 33 40
Total interest-bearing liabilities 26,973,961 27,529,309
Fair Value | Money-market and savings accounts    
Interest-bearing liabilities:    
Deposits 10,725,860 10,503,731
Fair Value | Certificates of deposit    
Interest-bearing liabilities:    
Deposits 9,342,026 10,593,666
Carrying Value    
Earning assets:    
Cash and cash equivalents 3,539,341 4,700,366
Trading investments 51,963 53,262
Available-for-sale investments 1,775,784 1,933,226
Accrued interest receivable 1,690,102 1,546,590
Derivative instruments 3 0
Total earning assets 28,672,260 29,135,602
Interest-bearing liabilities:    
Long-term borrowings 6,838,995 6,440,345
Accrued interest payable 77,128 108,488
Derivative instruments 33 40
Total interest-bearing liabilities 26,928,264 27,615,625
Carrying Value | Money-market and savings accounts    
Interest-bearing liabilities:    
Deposits 10,718,204 10,526,324
Carrying Value | Certificates of deposit    
Interest-bearing liabilities:    
Deposits 9,293,904 10,540,428
Private Education Loans    
Earning assets:    
Loans held for investment, net, difference 3,144,102 3,208,223
Private Education Loans | Fair Value    
Earning assets:    
Loans held for investment, net 24,759,169 24,110,381
Private Education Loans | Carrying Value    
Earning assets:    
Loans held for investment, net $ 21,615,067 $ 20,902,158