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Fair value Measurements - Fair Values of Financial Assets and Liabilities, Including Derivative Financial Instruments (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Earning assets: |  |
Accrued Interest Receivable, Fair Value Disclosure, Different Between Carrying Value And Fair Value | $ 93,861 |
Income taxes receivable, net | 41,570 | $ 0
Derivative instruments | 701 | 0
Total earning assets, difference | 2,152,077 | 2,105,495
Interest-bearing liabilities: |  |
Long-term borrowings, difference | 5,373 | (24,601)
Total interest-bearing liabilities, difference | 63,304 | (34,688)
Excess of net asset fair value over carrying value | 2,215,381 | 2,070,807
Certificates of Deposit |  |
Interest-bearing liabilities: |  |
Certificates of deposits, difference | 38,780 | (10,087)
Fair Value |  |
Earning assets: |  |
Cash and cash equivalents | 2,559,106 | 1,534,339
Available-for-sale investments | 176,245 | 244,088
Accrued interest receivable | 1,285,842 | 967,482
Income taxes receivable, net | 39,207 | 168,011
Derivative instruments | 2,090 | 812
Total | 28,391,625 | 23,587,868
Interest-bearing liabilities: |  |
Short-term borrowings | 0 | 0
Long-term borrowings | 4,278,931 | 3,299,871
Accrued interest payable | 61,341 | 35,363
Derivative instruments | 2,032 | 2,584
Total interest-bearing liabilities | 23,226,455 | 18,852,235
Fair Value | Money-market and savings accounts |  |
Interest-bearing liabilities: |  |
Deposits | 9,370,957 | 8,470,209
Fair Value | Certificates of Deposit |  |
Interest-bearing liabilities: |  |
Deposits | 9,513,194 | 7,044,208
Carrying Value |  |
Earning assets: |  |
Cash and cash equivalents | 2,559,106 | 1,534,339
Available-for-sale investments | 176,245 | 244,088
Accrued interest receivable | 1,191,981 | 967,482
Income taxes receivable, net | 39,207 | 168,011
Derivative instruments | 2,090 | 812
Total | 26,239,548 | 21,482,373
Interest-bearing liabilities: |  |
Short-term borrowings | 0 | 0
Long-term borrowings | 4,284,304 | 3,275,270
Accrued interest payable | 61,341 | 35,363
Derivative instruments | 2,032 | 2,584
Total interest-bearing liabilities | 23,289,759 | 18,817,547
Carrying Value | Money-market and savings accounts |  |
Interest-bearing liabilities: |  |
Deposits | 9,390,108 | 8,470,209
Certificates of deposits, difference | 19,151 |
Carrying Value | Certificates of Deposit |  |
Interest-bearing liabilities: |  |
Deposits | 9,551,974 | 7,034,121
Private Education Loans |  |
Earning assets: |  |
Loans held for investment, net, difference | 2,018,576 | 2,082,214
Private Education Loans | Fair Value |  |
Earning assets: |  |
Private Education Loans | 22,313,419 | 19,327,044
Private Education Loans | Carrying Value |  |
Earning assets: |  |
Private Education Loans | 20,294,843 | 17,244,830
FFELP Loans |  |
Earning assets: |  |
Loans held for investment, net, difference | 11,296 | 17,054
FFELP Loans | Fair Value |  |
Earning assets: |  |
Private Education Loans | 859,185 | 946,213
FFELP Loans | Carrying Value |  |
Earning assets: |  |
Private Education Loans | 847,889 | 929,159
Personal Loans |  |
Earning assets: |  |
Loans held for investment, net, difference | 28,344 | 6,227
Personal Loans | Fair Value |  |
Earning assets: |  |
Private Education Loans | 1,156,531 | 399,879
Personal Loans | Carrying Value |  |
Earning assets: |  |
Private Education Loans | $ 1,128,187 | $ 393,652

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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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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=6879938&loc=d3e572229-122910 + Details
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