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Fair Value Measurements - Fair Values of Financial Assets and Liabilities, Including Derivative Financial Instruments (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Earning assets: |  |
Accrued interest receivable, difference between carrying and fair value | $ 98,746 | $ 93,861
Tax indemnification receivable | 88,844 | 41,570
Total earning assets, difference | 2,265,887 | 2,152,077
Interest-bearing liabilities: |  |
Long-term borrowings, difference | (80,286) | 5,373
Total interest-bearing liabilities, difference | (226,078) | 63,304
Excess of net asset fair value over carrying value | 2,039,809 | 2,215,381
Certificates of Deposit |  |
Interest-bearing liabilities: |  |
Certificates of deposits, difference | (117,264) | 38,780
Fair Value |  |
Earning assets: |  |
Credit Cards | 3,818 |
Cash and cash equivalents | 5,563,877 | 2,559,106
Available-for-sale investments | 487,669 | 176,245
Accrued interest receivable | 1,491,471 | 1,285,842
Tax indemnification receivable | 27,558 | 39,207
Derivative instruments | 715 | 2,090
Total | 34,406,223 | 28,391,625
Interest-bearing liabilities: |  |
Short-term borrowings | 289,230 | 0
Long-term borrowings | 4,434,323 | 4,278,931
Accrued interest payable | 75,158 | 61,341
Derivative instruments | 1,164 | 2,032
Total interest-bearing liabilities | 29,228,573 | 23,226,455
Fair Value | Money-market and savings accounts |  |
Interest-bearing liabilities: |  |
Deposits | 10,363,691 | 9,370,957
Fair Value | Certificates of Deposit |  |
Interest-bearing liabilities: |  |
Deposits | 14,065,007 | 9,513,194
Carrying Value |  |
Earning assets: |  |
Credit Cards | 3,818 |
Cash and cash equivalents | 5,563,877 | 2,559,106
Available-for-sale investments | 487,669 | 176,245
Accrued interest receivable | 1,392,725 | 1,191,981
Tax indemnification receivable | 27,558 | 39,207
Derivative instruments | 715 | 2,090
Total | 32,140,336 | 26,239,548
Interest-bearing liabilities: |  |
Short-term borrowings | 289,230 | 0
Long-term borrowings | 4,354,037 | 4,284,304
Accrued interest payable | 75,158 | 61,341
Derivative instruments | 1,164 | 2,032
Total interest-bearing liabilities | 29,002,495 | 23,289,759
Carrying Value | Money-market and savings accounts |  |
Interest-bearing liabilities: |  |
Deposits | 10,335,163 | 9,390,108
Certificates of deposits, difference | (28,528) | 19,151
Carrying Value | Certificates of Deposit |  |
Interest-bearing liabilities: |  |
Deposits | 13,947,743 | 9,551,974
Private Education Loans |  |
Earning assets: |  |
Loans held for investment, net, difference | 2,092,426 | 2,018,576
Private Education Loans | Fair Value |  |
Earning assets: |  |
Private Education Loans | 24,988,941 | 22,313,419
Private Education Loans | Carrying Value |  |
Earning assets: |  |
Private Education Loans | 22,896,515 | 20,294,843
FFELP Loans |  |
Earning assets: |  |
Loans held for investment, net, difference | 11,239 | 11,296
FFELP Loans | Fair Value |  |
Earning assets: |  |
Private Education Loans | 795,055 | 859,185
FFELP Loans | Carrying Value |  |
Earning assets: |  |
Private Education Loans | 783,816 | 847,889
Personal Loans |  |
Earning assets: |  |
Loans held for investment, net, difference | 63,476 | 28,344
Personal Loans | Fair Value |  |
Earning assets: |  |
Private Education Loans | 1,047,119 | 1,156,531
Personal Loans | Carrying Value |  |
Earning assets: |  |
Private Education Loans | $ 983,643 | $ 1,128,187

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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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- Definition Carrying amount as of the balance sheet date of income taxes previously overpaid to tax authorities (such as U.S. Federal, state and local tax authorities) representing refunds of overpayments or recoveries based on agreed-upon resolutions of disputes. Also called income tax refund receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(8)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(10)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 + Details
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