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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
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