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Borrowings - Summary of Exposure Related to Unconsolidated VIEs (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019
--- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |
Estimated Fair Value | $ 2,342,089 | $ 2,517,956 |  |  |
Liability for unfunded commitments | 124,924 | 72,713 | $ 110,044 | $ 115,758 | $ 2,481
Variable Interest Entity, Not Primary Beneficiary | Private Education Loan term securitizations: |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Estimated Fair Value | 329,188 | 192,245 |  |  |
Equity Interests | 50,786 | 37,465 |  |  |
Liability for unfunded commitments | $ 379,974 | $ 229,710 |  |  |

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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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