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Fair Value Measurements - Fair Values of Financial Assets and Liabilities, Including Derivative Financial Instruments (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Earning assets |  |
Trading investments | $ 14,651 | $ 0
Accrued interest receivable, difference | 94,501 | 98,746
Tax indemnification receivable | 505,208 | 88,844
Total earning assets, difference | 3,481,411 | 2,265,887
Interest-bearing liabilities |  |
Long-term borrowings, difference | (189,085) | (80,286)
Total interest-bearing liabilities, difference | (489,482) | (226,078)
Excess of net asset fair value over carrying value | 2,991,929 | 2,039,809
Money-market and savings accounts |  |
Interest-bearing liabilities |  |
Deposits, difference | (74,432) | (28,528)
Certificates of deposit |  |
Interest-bearing liabilities |  |
Deposits, difference | (225,965) | (117,264)
Fair Value |  |
Earning assets |  |
Cash and cash equivalents | 4,351,045 | 5,563,877
Trading investments | 14,651 | 0
Available-for-sale investments | 2,090,707 | 487,669
Accrued interest receivable | 1,567,103 | 1,491,471
Tax indemnification receivable | 28,256 | 27,558
Derivative instruments | 541 | 715
Total earning assets | 33,148,984 | 34,406,223
Interest-bearing liabilities |  |
Short-term borrowings | 0 | 289,230
Long-term borrowings | 5,136,732 | 4,434,323
Accrued interest payable | 75,196 | 75,158
Derivative instruments | 0 | 1,164
Total interest-bearing liabilities | 28,621,763 | 29,228,573
Fair Value | Money-market and savings accounts |  |
Interest-bearing liabilities |  |
Deposits | 10,944,983 | 10,363,691
Fair Value | Certificates of deposit |  |
Interest-bearing liabilities |  |
Deposits | 12,464,852 | 14,065,007
Carrying Value |  |
Earning assets |  |
Cash and cash equivalents | 4,351,045 | 5,563,877
Trading investments | 14,651 | 0
Available-for-sale investments | 2,090,707 | 487,669
Accrued interest receivable | 1,472,602 | 1,392,725
Tax indemnification receivable | 28,256 | 27,558
Derivative instruments | 541 | 715
Total earning assets | 29,667,573 | 32,140,336
Interest-bearing liabilities |  |
Short-term borrowings | 0 | 289,230
Long-term borrowings | 4,947,647 | 4,354,037
Accrued interest payable | 75,196 | 75,158
Derivative instruments | 0 | 1,164
Total interest-bearing liabilities | 28,132,281 | 29,002,495
Carrying Value | Money-market and savings accounts |  |
Interest-bearing liabilities |  |
Deposits | 10,870,551 | 10,335,163
Carrying Value | Certificates of deposit |  |
Interest-bearing liabilities |  |
Deposits | 12,238,887 | 13,947,743
Private Education Loans |  |
Earning assets |  |
Loans held for investment, net, difference | 3,373,050 | 2,092,426
Private Education Loans | Fair Value |  |
Earning assets |  |
Loans held for investment, net | 24,328,972 | 24,988,941
Private Education Loans | Carrying Value |  |
Earning assets |  |
Loans held for investment, net | 20,955,922 | 22,896,515
FFELP Loans |  |
Earning assets |  |
Loans held for investment, net, difference | 13,519 | 11,239
FFELP Loans | Fair Value |  |
Earning assets |  |
Loans held for investment, net | 756,739 | 795,055
FFELP Loans | Carrying Value |  |
Earning assets |  |
Loans held for investment, net | 743,220 | 783,816
Personal Loans |  |
Earning assets |  |
Loans held for investment, net, difference | 0 | 63,476
Personal Loans | Fair Value |  |
Earning assets |  |
Loans held for investment, net | 0 | 1,047,119
Personal Loans | Carrying Value |  |
Earning assets |  |
Loans held for investment, net | 0 | 983,643
Credit Cards |  |
Earning assets |  |
Loans held for investment, net, difference | 341 | 0
Credit Cards | Fair Value |  |
Earning assets |  |
Loans held for investment, net | 10,970 | 3,818
Credit Cards | Carrying Value |  |
Earning assets |  |
Loans held for investment, net | $ 10,629 | $ 3,818

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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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