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Fair Value Measurements - Fair Values of Financial Assets and Liabilities, Including Derivative Financial Instruments (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Earning assets:    
Trading investments $ 49,600 $ 53,262
Accrued interest receivable, difference 139,176 116,884
Derivative instruments 0 0
Total earning assets, difference 3,536,974 3,325,107
Interest-bearing liabilities:    
Long-term borrowings, difference 116,104 116,961
Derivative instruments 53 40
Total interest-bearing liabilities, difference 97,016 86,316
Excess of net asset fair value over carrying value 3,633,990 3,411,423
Money-market and savings accounts    
Interest-bearing liabilities:    
Deposits, difference 13,674 22,593
Certificates of deposit    
Interest-bearing liabilities:    
Deposits, difference (32,762) (53,238)
Fair Value    
Earning assets:    
Cash and cash equivalents 4,092,465 4,700,366
Trading investments 49,600 53,262
Available-for-sale investments 1,650,656 1,933,226
Accrued interest receivable 1,834,874 1,663,474
Derivative instruments 2 0
Total earning assets 32,185,727 32,460,709
Interest-bearing liabilities:    
Long-term borrowings 6,294,874 6,323,384
Accrued interest payable 109,207 108,488
Derivative instruments 55 40
Total interest-bearing liabilities 26,901,679 27,529,309
Fair Value | Money-market and savings accounts    
Interest-bearing liabilities:    
Deposits 10,671,377 10,503,731
Fair Value | Certificates of deposit    
Interest-bearing liabilities:    
Deposits 9,826,166 10,593,666
Carrying Value    
Earning assets:    
Cash and cash equivalents 4,092,465 4,700,366
Trading investments 49,600 53,262
Available-for-sale investments 1,650,656 1,933,226
Accrued interest receivable 1,695,698 1,546,590
Derivative instruments 2 0
Total earning assets 28,648,753 29,135,602
Interest-bearing liabilities:    
Long-term borrowings 6,410,978 6,440,345
Accrued interest payable 109,207 108,488
Derivative instruments 55 40
Total interest-bearing liabilities 26,998,695 27,615,625
Carrying Value | Money-market and savings accounts    
Interest-bearing liabilities:    
Deposits 10,685,051 10,526,324
Carrying Value | Certificates of deposit    
Interest-bearing liabilities:    
Deposits 9,793,404 10,540,428
Private Education Loans    
Earning assets:    
Loans held for investment, net, difference 3,397,798 3,208,223
Private Education Loans | Fair Value    
Earning assets:    
Loans held for investment, net 24,558,130 24,110,381
Private Education Loans | Carrying Value    
Earning assets:    
Loans held for investment, net $ 21,160,332 $ 20,902,158