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Borrowings - Summary of Exposure Related To Unconsolidated VIEs (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022 | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Estimated Fair Value | $ 2,311,062 | $ 2,342,089 |  |
Total Exposure | 32,720 | 124,924 | $ 32,707 | $ 72,713
Variable Interest Entity, Not Primary Beneficiary | Private Education Loan term securitizations |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Estimated Fair Value | 317,077 | 329,188 |  |
Equity Interests | 51,342 | 50,786 |  |
Total Exposure | $ 368,419 | $ 379,974 |  |

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- Definition Amount of expected credit loss for credit exposure on off-balance-sheet commitment, including but not limited to, loan commitment, standby letter of credit, financial guarantee not accounted for as insurance. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=121611286&loc=d3e11927-110247 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=124255206&loc=SL82919202-210446 + Details
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