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Fair Value Measurements - Fair Values of Financial Assets and Liabilities, Including Derivative Financial Instruments (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Earning assets |  |
Loans held for sale | $ 0 | $ 340,389
Trading investments | 30,594 | 16,923
Accrued interest receivable, difference | 108,633 | 140,511
Tax indemnification receivable | 169,655 | 374,706
Total earning assets, difference | 3,380,177 | 4,182,834
Interest-bearing liabilities |  |
Long-term borrowings, difference | (199,096) | (209,092)
Total interest-bearing liabilities, difference | (408,148) | (479,976)
Excess of net asset fair value over carrying value | 2,972,029 | 3,702,858
Money-market and savings accounts |  |
Interest-bearing liabilities |  |
Deposits, difference | (54,706) | (68,927)
Certificates of deposit |  |
Interest-bearing liabilities |  |
Deposits, difference | (154,346) | (201,957)
Fair Value |  |
Earning assets |  |
Loans held for sale | 0 | 3,226,029
Cash and cash equivalents | 6,207,001 | 4,455,292
Trading investments | 30,594 | 16,923
Available-for-sale investments | 2,115,885 | 1,996,634
Accrued interest receivable | 1,373,593 | 1,527,816
Tax indemnification receivable | 15,678 | 18,492
Derivative instruments | 1,054 | 729
Total earning assets | 33,383,636 | 34,126,992
Interest-bearing liabilities |  |
Long-term borrowings | 5,117,766 | 5,398,309
Accrued interest payable | 79,231 | 60,272
Derivative instruments | 451 | 287
Total interest-bearing liabilities | 28,207,823 | 28,394,651
Fair Value | Money-market and savings accounts |  |
Interest-bearing liabilities |  |
Deposits | 11,961,848 | 11,136,560
Fair Value | Certificates of deposit |  |
Interest-bearing liabilities |  |
Deposits | 11,048,527 | 11,799,223
Carrying Value |  |
Earning assets |  |
Loans held for sale | 0 | 2,885,640
Cash and cash equivalents | 6,207,001 | 4,455,292
Trading investments | 30,594 | 16,923
Available-for-sale investments | 2,115,885 | 1,996,634
Accrued interest receivable | 1,264,960 | 1,387,305
Tax indemnification receivable | 15,678 | 18,492
Derivative instruments | 1,054 | 729
Total earning assets | 30,003,459 | 29,944,158
Interest-bearing liabilities |  |
Long-term borrowings | 4,918,670 | 5,189,217
Accrued interest payable | 79,231 | 60,272
Derivative instruments | 451 | 287
Total interest-bearing liabilities | 27,799,675 | 27,914,675
Carrying Value | Money-market and savings accounts |  |
Interest-bearing liabilities |  |
Deposits | 11,907,142 | 11,067,633
Carrying Value | Certificates of deposit |  |
Interest-bearing liabilities |  |
Deposits | 10,894,181 | 11,597,266
Private Education Loans |  |
Earning assets |  |
Loans held for investment, net, difference | 3,256,987 | 3,687,203
Private Education Loans | Fair Value |  |
Earning assets |  |
Loans held for investment, net | 22,889,920 | 22,124,171
Private Education Loans | Carrying Value |  |
Earning assets |  |
Loans held for investment, net | 19,632,933 | 18,436,968
FFELP Loans |  |
Earning assets |  |
Loans held for investment, net, difference | 13,279 | 13,449
FFELP Loans | Fair Value |  |
Earning assets |  |
Loans held for investment, net | 738,579 | 748,657
FFELP Loans | Carrying Value |  |
Earning assets |  |
Loans held for investment, net | 725,300 | 735,208
Credit Cards |  |
Earning assets |  |
Loans held for investment, net, difference | 1,278 | 1,282
Credit Cards | Fair Value |  |
Earning assets |  |
Loans held for investment, net | 11,332 | 12,249
Credit Cards | Carrying Value |  |
Earning assets |  |
Loans held for investment, net | $ 10,054 | $ 10,967

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- Definition Fair value of financial obligations, including, but not limited to, debt instruments, derivative liabilities, federal funds purchased and sold under agreements to repurchase, securities loaned or sold under agreements to repurchase, financial instruments sold not yet purchased, guarantees, line of credit, loans and notes payable, servicing liability, and trading liabilities. + References No definition available. + Details
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