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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2018
Fair Value Disclosures [Abstract] |
Valuation of financial instruments that are marked-to-market on recurring basis | The following table summarizes the valuation of our financial instruments that are marked-to-fair value on a recurring basis.
|  | Fair Value Measurements on a Recurring Basis
|  | December 31, 2018 |  | December 31, 2017
|  | Level 1 |  | Level 2 |  | Level 3 |  | Total |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale investments |  | $ | — |  |  | $ | 176,245 |  |  | $ | — |  |  | $ | 176,245 |  |  | $ | — |  |  | $ | 244,088 |  |  | $ | — |  |  | $ | 244,088 |
Derivative instruments |  | — |  |  | 2,090 |  |  | — |  |  | 2,090 |  |  | — |  |  | 812 |  |  | — |  |  | 812 |
Total |  | $ | — |  |  | $ | 178,335 |  |  | $ | — |  |  | $ | 178,335 |  |  | $ | — |  |  | $ | 244,900 |  |  | $ | — |  |  | $ | 244,900 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative instruments |  | $ | — |  |  | $ | (2,032 | ) |  | $ | — |  |  | $ | (2,032 | ) |  | $ | — |  |  | $ | (2,584 | ) |  | $ | — |  |  | $ | (2,584 | )
Total |  | $ | — |  |  | $ | (2,032 | ) |  | $ | — |  |  | $ | (2,032 | ) |  | $ | — |  |  | $ | (2,584 | ) |  | $ | — |  |  | $ | (2,584 | )
Fair values of financial assets and liabilities, including derivative financial instruments | The following table summarizes the fair values of our financial assets and liabilities, including derivative financial instruments.
|  | December 31, 2018 |  | December 31, 2017
|  | Fair Value |  | Carrying Value |  | Difference |  | Fair Value |  | Carrying Value |  | Difference
Earning assets: |  |  |  |  |  |  |  |  |  |  |  |
Loans held for investment, net: |  |  |  |  |  |  |  |  |  |  |  |
Private Education Loans |  | $ | 22,313,419 |  |  | $ | 20,294,843 |  |  | $ | 2,018,576 |  |  | $ | 19,327,044 |  |  | $ | 17,244,830 |  |  | $ | 2,082,214 |
FFELP Loans |  | 859,185 |  |  | 847,889 |  |  | 11,296 |  |  | 946,213 |  |  | 929,159 |  |  | 17,054 |
Personal Loans |  | 1,156,531 |  |  | 1,128,187 |  |  | 28,344 |  |  | 399,879 |  |  | 393,652 |  |  | 6,227 |
Cash and cash equivalents |  | 2,559,106 |  |  | 2,559,106 |  |  | — |  |  | 1,534,339 |  |  | 1,534,339 |  |  | — |
Available-for-sale investments |  | 176,245 |  |  | 176,245 |  |  | — |  |  | 244,088 |  |  | 244,088 |  |  | — |
Accrued interest receivable |  | 1,285,842 |  |  | 1,191,981 |  |  | 93,861 |  |  | 967,482 |  |  | 967,482 |  |  | — |
Tax indemnification receivable |  | 39,207 |  |  | 39,207 |  |  | — |  |  | 168,011 |  |  | 168,011 |  |  | — |
Derivative instruments |  | 2,090 |  |  | 2,090 |  |  | — |  |  | 812 |  |  | 812 |  |  | — |
Total earning assets |  | $ | 28,391,625 |  |  | $ | 26,239,548 |  |  | $ | 2,152,077 |  |  | $ | 23,587,868 |  |  | $ | 21,482,373 |  |  | $ | 2,105,495 |
Interest-bearing liabilities: |  |  |  |  |  |  |  |  |  |  |  |
Money-market and savings accounts |  | $ | 9,370,957 |  |  | $ | 9,390,108 |  |  | $ | 19,151 |  |  | $ | 8,470,209 |  |  | $ | 8,470,209 |  |  | $ | — |
Certificates of deposit |  | 9,513,194 |  |  | 9,551,974 |  |  | 38,780 |  |  | 7,044,208 |  |  | 7,034,121 |  |  | (10,087 | )
Short-term borrowings |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Long-term borrowings |  | 4,278,931 |  |  | 4,284,304 |  |  | 5,373 |  |  | 3,299,871 |  |  | 3,275,270 |  |  | (24,601 | )
Accrued interest payable |  | 61,341 |  |  | 61,341 |  |  | — |  |  | 35,363 |  |  | 35,363 |  |  | — |
Derivative instruments |  | 2,032 |  |  | 2,032 |  |  | — |  |  | 2,584 |  |  | 2,584 |  |  | — |
Total interest-bearing liabilities |  | $ | 23,226,455 |  |  | $ | 23,289,759 |  |  | $ | 63,304 |  |  | $ | 18,852,235 |  |  | $ | 18,817,547 |  |  | $ | (34,688 | )
Excess of net asset fair value over carrying value |  |  |  |  |  | $ | 2,215,381 |  |  |  |  |  |  | $ | 2,070,807 |

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13467-108611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19190-110258 + Details
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