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Loans Held for Investment - Narrative (Details) - USD ($) | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Dec. 31, 2022 | Jul. 01, 2006 | Jun. 30, 2006 | Sep. 30, 1993
Receivables [Abstract] |  |  |  |  |  |
Percent of private loans indexed to LIBOR | 42.00% |  | 45.00% |  |  |
Tier 1 of government guarantee (at least) | 97.00% |  |  | 97.00% |  |
Tier 2 of government guarantee |  |  |  |  | 98.00% |
Tier 3 of government guarantee |  |  |  |  |  | 100.00%
Gain on sales of loans, net | $ (9,000) | $ 9,881,000 |  |  |  |
Proceeds from sale of loans receivable | $ 0 | 95,000,000 |  |  |  |
Net proceeds from sales of loans held for investment, principal |  | 89,000,000 |  |  |  |
Net proceeds from sales of loans held for investment, capitalized interest |  | $ 6,000,000 |  |  |  |
Estimated weighted average life of student loans | 5 years |  | 5 years |  |  |

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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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