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Loans Held for Investment - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |
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Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021 | Jul. 01, 2006 | Jun. 30, 2006 | Sep. 30, 1993
Receivables [Abstract] |  |  |  |  |  |  |  |
Percent of private loans indexed to LIBOR | 50.00% |  | 50.00% |  | 52.00% |  |  |
Tier 1 of government guarantee (at least) | 97.00% |  | 97.00% |  |  | 97.00% |  |
Tier 2 of government guarantee |  |  |  |  |  |  | 98.00% |
Tier 3 of government guarantee |  |  |  |  |  |  |  | 100.00%
Gain from sale | $ 239,997 | $ 3,679 | $ 249,878 | $ 402,790 |  |  |  |
Proceeds from sale of loans |  |  | 2,240,000 | 3,190,000 |  |  |  |
Net proceeds from sales of loans held for investment, principal |  |  | 2,100,000 | 2,990,000 |  |  |  |
Net proceeds from sales of loans held for investment, capitalized interest |  |  | $ 142,000 | $ 195,000 |  |  |  |
Estimated weighted average life of student loans |  |  | 4 years 9 months 18 days |  | 4 years 8 months 12 days |  |  |

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- Definition Amount of gain (loss) on sale of financing receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 5 -URI https://asc.fasb.org/extlink&oid=121570589&loc=d3e107425-111719 + Details
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