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Fair Value Measurements - Fair Values of Financial Assets and Liabilities, Including Derivative Financial Instruments (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Earning assets |  |
Trading investments | $ 47,707 | $ 37,465
Accrued interest receivable, difference | 40,760 | 100,743
Tax indemnification receivable | 225,073 | 239,578
Total earning assets, difference | 1,922,273 | 3,409,977
Interest-bearing liabilities |  |
Long-term borrowings, difference | 263,987 | (69,184)
Total interest-bearing liabilities, difference | 512,514 | (151,510)
Excess of net asset fair value over carrying value | 2,434,787 | 3,258,467
Money-market and savings accounts |  |
Interest-bearing liabilities |  |
Deposits, difference | 86,309 | (24,799)
Certificates of deposit |  |
Interest-bearing liabilities |  |
Deposits, difference | 162,218 | (57,527)
Fair Value |  |
Earning assets |  |
Cash and cash equivalents | 3,649,651 | 4,334,603
Trading investments | 47,707 | 37,465
Available-for-sale investments | 2,566,556 | 2,517,956
Accrued interest receivable | 1,233,370 | 1,306,410
Tax indemnification receivable | 8,268 | 8,047
Derivative instruments | 1,781 | 1,322
Total earning assets | 28,590,174 | 31,856,320
Interest-bearing liabilities |  |
Long-term borrowings | 4,955,323 | 6,000,174
Accrued interest payable | 44,065 | 46,600
Derivative instruments | 3,853 | 252
Total interest-bearing liabilities | 24,731,979 | 26,956,044
Fair Value | Money-market and savings accounts |  |
Interest-bearing liabilities |  |
Deposits | 11,666,178 | 11,457,490
Fair Value | Certificates of deposit |  |
Interest-bearing liabilities |  |
Deposits | 8,062,560 | 9,451,528
Carrying Value |  |
Earning assets |  |
Cash and cash equivalents | 3,649,651 | 4,334,603
Trading investments | 47,707 | 37,465
Available-for-sale investments | 2,566,556 | 2,517,956
Accrued interest receivable | 1,192,610 | 1,205,667
Tax indemnification receivable | 8,268 | 8,047
Derivative instruments | 1,781 | 1,322
Total earning assets | 26,667,901 | 28,446,343
Interest-bearing liabilities |  |
Long-term borrowings | 5,219,310 | 5,930,990
Accrued interest payable | 44,065 | 46,600
Derivative instruments | 3,853 | 252
Total interest-bearing liabilities | 25,244,493 | 26,804,534
Carrying Value | Money-market and savings accounts |  |
Interest-bearing liabilities |  |
Deposits | 11,752,487 | 11,432,691
Carrying Value | Certificates of deposit |  |
Interest-bearing liabilities |  |
Deposits | 8,224,778 | 9,394,001
Private Education Loans |  |
Earning assets |  |
Loans held for investment, net, difference | 1,867,009 | 3,294,462
Private Education Loans | Fair Value |  |
Earning assets |  |
Loans held for investment, net | 20,378,259 | 22,919,836
Private Education Loans | Carrying Value |  |
Earning assets |  |
Loans held for investment, net | 18,511,250 | 19,625,374
FFELP Loans |  |
Earning assets |  |
Loans held for investment, net, difference | 12,199 | 12,690
FFELP Loans | Fair Value |  |
Earning assets |  |
Loans held for investment, net | 675,651 | 705,644
FFELP Loans | Carrying Value |  |
Earning assets |  |
Loans held for investment, net | 663,452 | 692,954
Credit Cards |  |
Earning assets |  |
Loans held for investment, net, difference | 2,305 | 2,082
Credit Cards | Fair Value |  |
Earning assets |  |
Loans held for investment, net | 28,931 | 25,037
Credit Cards | Carrying Value |  |
Earning assets |  |
Loans held for investment, net | $ 26,626 | $ 22,955

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