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Allowance for Credit Losses - Age Analysis of Past Due Loans Delinquencies (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Private Education Loans allowance for losses | $ (1,364,716) | $ (1,479,306) | $ (1,357,075) | $ (1,081,066) | $ (1,227,362) | $ (1,165,335)
Loans held for investment, net | $ 19,219,518 |  | $ 19,626,868 |  |  |
Percentage of Private Education Loans in repayment, Year 1 | 51.40% |  | 56.90% |  |  |
Percentage of Private Education Loans in repayment, Year 2 | 59.30% |  | 67.10% |  |  |
Percentage of Private Education Loans in repayment, Year 3 | 71.00% |  | 76.10% |  |  |
Percentage of Private Education Loans in repayment, Year 4 | 78.40% |  | 80.70% |  |  |
Percentage of Private Education Loans in repayment, Year 5 | 82.80% |  | 84.50% |  |  |
Percentage of Private Education Loans in repayment, After Year 5 | 89.10% |  | 89.30% |  |  |
Percentage of Private Education Loans in repayment | 73.50% |  | 74.50% |  |  |
Delinquent Private Education Loans in repayment as a percentage of Private Education Loans in repayment, Year 1 | 0.60% |  | 0.90% |  |  |
Delinquent Private Education Loans in repayment as a percentage of Private Education Loans in repayment, Year 2 | 1.20% |  | 1.90% |  |  |
Delinquent Private Education Loans in repayment as a percentage of Private Education Loans in repayment, Year 3 | 3.00% |  | 3.10% |  |  |
Delinquent Private Education Loans in repayment as a percentage of Private Education Loans in repayment, Year 4 | 3.50% |  | 4.00% |  |  |
Delinquent Private Education Loans in repayment as a percentage of Private Education Loans in repayment, Year 5 | 4.30% |  | 4.70% |  |  |
Delinquent Private Education Loans in repayment as a percentage of Private Education Loans in repayment, After Year 5 | 5.90% |  | 6.50% |  |  |
Delinquent Private Education Loans in repayment as a percentage of Private Education Loans in repayment, total | 3.70% |  | 3.80% |  |  |
Loans in forbearance as a percentage of loans in repayment and forbearance, Year 1 | 0.30% |  | 0.70% |  |  |
Loans in forbearance as a percentage of loans in repayment and forbearance, Year 2 | 0.80% |  | 2.10% |  |  |
Loans in forbearance as a percentage of loans in repayment and forbearance, Year 3 | 1.20% |  | 1.90% |  |  |
Loans in forbearance as a percentage of loans in repayment and forbearance, Year 4 | 1.20% |  | 2.10% |  |  |
Loans in forbearance as a percentage of loans in repayment and forbearance, Year 5 | 1.40% |  | 2.20% |  |  |
Loans in forbearance as a percentage of loans in repayment and forbearance, After Year 5 | 1.70% |  | 2.00% |  |  |
Loans in forbearance as a percentage of loans in repayment and forbearance | 1.20% |  | 1.80% |  |  |
Consumer Portfolio Segment | Student Loan |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total Private Education Loans in forbearance, Year 1 | $ 706,415 |  | $ 2,432,838 |  |  |
Total Private Education Loans in forbearance, Year 2 | 3,250,828 |  | 3,049,477 |  |  |
Total Private Education Loans in forbearance, Year 3 | 2,452,121 |  | 1,967,756 |  |  |
Total Private Education Loans in forbearance, Year 4 | 1,624,387 |  | 1,754,219 |  |  |
Total Private Education Loans in forbearance, Year 5 | 1,510,455 |  | 1,365,979 |  |  |
Total Private Education Loans in forbearance, After Year 5 | 5,108,321 |  | 4,559,281 |  |  |
Private Education Loans in forbearance, total | 14,652,527 |  | 15,129,550 |  |  |
Total Private Education Loans, gross, Year 1 | 1,374,107 |  | 4,276,533 |  |  |
Total Private Education Loans, gross, Year 2 | 5,481,115 |  | 4,547,159 |  |  |
Total Private Education Loans, gross, Year 3 | 3,455,211 |  | 2,584,622 |  |  |
Total Private Education Loans, gross, Year 4 | 2,071,289 |  | 2,172,660 |  |  |
Total Private Education Loans, gross, Year 5 | 1,824,409 |  | 1,615,842 |  |  |
Total Private Education Loans, gross, After Year 5 | 5,732,232 |  | 5,106,872 |  |  |
Total Private Education Loans, gross | 19,938,363 |  | 20,303,688 |  |  |
Private Education Loans deferred origination costs and unamortized premium/(discount), Year 1 | 15,578 |  | 26,714 |  |  |
Private Education Loans deferred origination costs and unamortized premium/(discount), Year 2 | 22,160 |  | 15,933 |  |  |
Private Education Loans deferred origination costs and unamortized premium/(discount), Year 3 | 11,691 |  | 9,062 |  |  |
Private Education Loans deferred origination costs and unamortized premium/(discount), Year 4 | 6,991 |  | 5,496 |  |  |
Private Education Loans deferred origination costs and unamortized premium/(discount), Year 5 | 4,282 |  | 3,575 |  |  |
Private Education Loans deferred origination costs and unamortized premium/(discount), After Year 5 | 10,133 |  | 8,876 |  |  |
Private Education Loans deferred origination costs and unamortized premium/(discount), Total | 70,835 |  | 69,656 |  |  |
Total Private Education Loans, Year 1 | 1,389,685 |  | 4,303,247 |  |  |
Total Private Education Loans, Year 2 | 5,503,275 |  | 4,563,092 |  |  |
Total Private Education Loans, Year 3 | 3,466,902 |  | 2,593,684 |  |  |
Total Private Education Loans, Year 4 | 2,078,280 |  | 2,178,156 |  |  |
Total Private Education Loans, Year 5 | 1,828,691 |  | 1,619,417 |  |  |
Total Private Education Loans, After Year 5 | 5,742,365 |  | 5,115,748 |  |  |
Total Private Education Loans | 20,009,198 |  | 20,373,344 |  |  |
Private Education Loans allowance for losses, Year 1 | (111,240) |  | (304,943) |  |  |
Private Education Loans allowance for losses, Year 2 | (361,582) |  | (323,506) |  |  |
Private Education Loans allowance for losses, Year 3 | (235,893) |  | (181,915) |  |  |
Private Education Loans allowance for losses, Year 4 | (142,493) |  | (141,424) |  |  |
Private Education Loans allowance for losses, Year 5 | (120,744) |  | (101,023) |  |  |
Private Education Loans allowance for losses, After Year 5 | (388,342) |  | (300,820) |  |  |
Private Education Loans allowance for losses | (1,360,294) |  | (1,353,631) |  |  |
Private Education Loans, net, Year 1 | 1,278,445 |  | 3,998,304 |  |  |
Private Education Loans, net, Year 2 | 5,141,693 |  | 4,239,586 |  |  |
Private Education Loans, net, Year 3 | 3,231,009 |  | 2,411,769 |  |  |
Private Education Loans, net, Year 4 | 1,935,787 |  | 2,036,732 |  |  |
Private Education Loans, net, Year 5 | 1,707,947 |  | 1,518,394 |  |  |
Private Education Loans, net, After Year 5 | 5,354,023 |  | 4,814,928 |  |  |
Loans held for investment, net | 18,648,904 |  | 19,019,713 |  |  |
Consumer Portfolio Segment | Student Loan | Loan delinquent, current |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Year 1 | 702,266 |  | 2,411,441 |  |  |
Year 2 | 3,213,074 |  | 2,991,839 |  |  |
Year 3 | 2,378,874 |  | 1,907,574 |  |  |
Year 4 | 1,568,100 |  | 1,683,986 |  |  |
Year 5 | 1,446,011 |  | 1,301,809 |  |  |
After Year 5 | 4,804,780 |  | 4,262,698 |  |  |
Loan type | 14,113,105 |  | 14,559,347 |  |  |
Consumer Portfolio Segment | Student Loan | Loan delinquent 30-59 days |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Year 1 | 2,870 |  | 14,164 |  |  |
Year 2 | 21,473 |  | 30,740 |  |  |
Year 3 | 33,582 |  | 30,877 |  |  |
Year 4 | 26,079 |  | 35,213 |  |  |
Year 5 | 30,398 |  | 31,366 |  |  |
After Year 5 | 150,263 |  | 144,948 |  |  |
Loan type | 264,665 |  | 287,308 |  |  |
Consumer Portfolio Segment | Student Loan | Loan delinquent 60-89 days |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Year 1 | 734 |  | 5,523 |  |  |
Year 2 | 9,460 |  | 15,056 |  |  |
Year 3 | 20,352 |  | 14,433 |  |  |
Year 4 | 15,033 |  | 18,201 |  |  |
Year 5 | 16,252 |  | 16,697 |  |  |
After Year 5 | 76,402 |  | 77,595 |  |  |
Loan type | 138,233 |  | 147,505 |  |  |
Consumer Portfolio Segment | Student Loan | Loan delinquent 90 days or greater past due |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Year 1 | 545 |  | 1,710 |  |  |
Year 2 | 6,821 |  | 11,842 |  |  |
Year 3 | 19,313 |  | 14,872 |  |  |
Year 4 | 15,175 |  | 16,819 |  |  |
Year 5 | 17,794 |  | 16,107 |  |  |
After Year 5 | 76,876 |  | 74,040 |  |  |
Loan type | 136,524 |  | 135,390 |  |  |
Loans In-School/Grace/Deferment | Consumer Portfolio Segment | Student Loan |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Year 1 | 665,614 |  | 1,827,649 |  |  |
Year 2 | 2,205,648 |  | 1,433,322 |  |  |
Year 3 | 974,090 |  | 578,253 |  |  |
Year 4 | 427,894 |  | 380,639 |  |  |
Year 5 | 293,081 |  | 219,280 |  |  |
After Year 5 | 535,529 |  | 455,910 |  |  |
Loan type | 5,101,856 |  | 4,895,053 |  |  |
Loans In Forbearance | Consumer Portfolio Segment | Student Loan |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total Private Education Loans in forbearance, Year 1 | 2,078 |  | 16,046 |  |  |
Total Private Education Loans in forbearance, Year 2 | 24,639 |  | 64,360 |  |  |
Total Private Education Loans in forbearance, Year 3 | 29,000 |  | 38,613 |  |  |
Total Private Education Loans in forbearance, Year 4 | 19,008 |  | 37,802 |  |  |
Total Private Education Loans in forbearance, Year 5 | 20,873 |  | 30,583 |  |  |
Total Private Education Loans in forbearance, After Year 5 | 88,382 |  | 91,681 |  |  |
Total Private Education Loans in forbearance | $ 183,980 |  | $ 279,085 |  |  |

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