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Allowance for Credit Losses - Age Analysis of Past Due Loans Delinquencies (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Private Education Loans allowance for losses $ (1,215,407) $ (1,160,244) $ (1,361,723) $ (1,734,559) $ (1,929,323) $ (441,912)
Loans held for investment, net $ 21,281,527   $ 19,183,143      
Percentage of Private Education Loans in repayment, 2021 57.50%          
Percentage of Private Education Loans in repayment, 2020 62.00%   59.60%      
Percentage of Private Education Loans in repayment, 2019 67.80%   64.70%      
Percentage of Private Education Loans in repayment, 2018 73.80%   71.30%      
Percentage of Private Education Loans in repayment, 2017 77.90%   75.30%      
Percentage of Private Education Loans in repayment, 2016 and prior 85.10%   80.00%      
Percentage of Private Education Loans in repayment, 2015 and prior     84.70%      
Percentage of Private Education Loans in repayment 71.40%   72.50%      
Delinquent Private Education Loans in repayment as a percentage of Private Education Loans in repayment, 2021 0.20%          
Delinquent Private Education Loans in repayment as a percentage of Private Education Loans in repayment, 2020 0.80%   0.50%      
Delinquent Private Education Loans in repayment as a percentage of Private Education Loans in repayment, 2019 1.90%   1.20%      
Delinquent Private Education Loans in repayment as a percentage of Private Education Loans in repayment, 2018 2.70%   2.40%      
Delinquent Private Education Loans in repayment as a percentage of Private Education Loans in repayment, 2017 3.20%   3.20%      
Delinquent Private Education Loans in repayment as a percentage of Private Education Loans in repayment, 2016 and prior 4.00%   3.80%      
Delinquent Private Education Loans in repayment as a percentage of Private Education Loans in repayment, 2015 and prior     4.80%      
Delinquent Private Education Loans in repayment as a percentage of Private Education Loans in repayment 2.40%   2.80%      
Loans in forbearance as a percentage of loans in repayment and forbearance, 2021 0.20%          
Loans in forbearance as a percentage of loans in repayment and forbearance, 2020 1.20%   0.80%      
Loans in forbearance as a percentage of loans in repayment and forbearance, 2019 2.20%   3.40%      
Loans in forbearance as a percentage of loans in repayment and forbearance, 2018 2.80%   5.00%      
Loans in forbearance as a percentage of loans in repayment and forbearance, 2017 3.30%   5.90%      
Loans in forbearance as a percentage of loans in repayment and forbearance, 2016 and Prior 3.10%   5.90%      
Loans in forbearance as a percentage of loans in repayment and forbearance, 2015 and Prior     4.90%      
Loans in forbearance as a percentage of loans in repayment and forbearance 2.30%   4.30%      
Student Loan | Consumer Portfolio Segment            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total Private Education Loans in repayment, 2021 $ 1,834,164          
Total Private Education Loans in repayment, 2020 2,767,086   $ 2,052,521      
Total Private Education Loans in repayment, 2019 2,450,321   2,603,996      
Total Private Education Loans in repayment, 2018 1,892,065   2,096,368      
Total Private Education Loans in repayment, 2017 1,691,930   1,912,370      
Total Private Education Loans in repayment, 2016 4,854,566   1,752,386      
Total Private Education Loans in repayment, 2015 and prior     3,887,180      
Total Private Education Loans in repayment 15,490,132   14,304,821      
Total Private Education Loans, gross, 2021 3,189,827          
Total Private Education Loans, gross, 2020 4,460,869   3,442,765      
Total Private Education Loans, gross, 2019 3,612,813   4,026,848      
Total Private Education Loans, gross, 2018 2,562,132   2,940,511      
Total Private Education Loans, gross, 2017 2,172,125   2,539,794      
Total Private Education Loans, gross, 2016 and prior 5,705,071   2,189,222      
Total Private Education Loans, gross, 2015 and prior     4,590,197      
Total Private Education Loans, gross 21,702,837   19,729,337      
Private Education Loans deferred origination costs and unamortized premium/(discount), 2021 16,763          
Private Education Loans deferred origination costs and unamortized premium/(discount), 2020 17,970   21,129      
Private Education Loans deferred origination costs and unamortized premium/(discount), 2019 11,357   13,933      
Private Education Loans deferred origination costs and unamortized premium/(discount), 2018 6,901   8,671      
Private Education Loans deferred origination costs and unamortized premium/(discount), 2017 5,275   6,708      
Private Education Loans deferred origination costs and unamortized premium/(discount), 2016 and prior 10,318   5,721      
Private Education Loans deferred origination costs and unamortized premium/(discount), 2015 and prior     7,313      
Private Education Loans deferred origination costs and unamortized premium/(discount), Total 68,584   63,475      
Total Private Education Loans, 2021 3,206,590          
Total Private Education Loans, 2020 4,478,839   3,463,894      
Total Private Education Loans, 2019 3,624,170   4,040,781      
Total Private Education Loans, 2018 2,569,033   2,949,182      
Total Private Education Loans, 2017 2,177,400   2,546,502      
Total Private Education Loans, 2016 and Prior 5,715,389   2,194,943      
Total Private Education Loans, 2015 and Prior     4,597,510      
Total Private Education Loans 21,771,421   19,792,812      
Private Education Loans allowance for losses, 2021 (173,374)          
Private Education Loans allowance for losses, 2020 (252,460)   (210,875)      
Private Education Loans allowance for losses, 2019 (220,891)   (298,776)      
Private Education Loans allowance for losses, 2018 (148,040)   (218,136)      
Private Education Loans allowance for losses, 2017 (118,966)   (184,265)      
Private Education Loans allowance for losses, 2016 and prior (295,729)   (150,150)      
Private Education Loans allowance for losses, 2015 and prior     (293,642)      
Private Education Loans allowance for losses (1,209,460)   (1,355,844)      
Private Education Loans, net, 2021 3,033,216          
Private Education Loans, net, 2020 4,226,379   3,253,019      
Private Education Loans, net, 2019 3,403,279   3,742,005      
Private Education Loans, net, 2018 2,420,993   2,731,046      
Private Education Loans, net, 2017 2,058,434   2,362,237      
Private Education Loans, net, 2016 and prior 5,419,660   2,044,793      
Private Education Loans, net, 2015 and prior     4,303,868      
Loans held for investment, net 20,561,961   18,436,968      
Student Loan | Consumer Portfolio Segment | Loan delinquent, current            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
2021 1,830,182          
2020 2,743,889   2,043,033      
2019 2,404,326   2,573,228      
2018 1,840,620   2,045,012      
2017 1,636,992   1,850,539      
2016 and prior 4,659,532   1,685,572      
2015 and Prior     3,701,564      
Total 15,115,541   13,898,948      
Student Loan | Consumer Portfolio Segment | Loan delinquent 30-59 days            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
2021 3,051          
2020 15,107   6,400      
2019 25,793   16,983      
2018 27,398   26,934      
2017 28,340   30,771      
2016 and prior 100,253   33,040      
2015 and Prior     91,400      
Total 199,942   205,528      
Student Loan | Consumer Portfolio Segment | Loan delinquent 60-89 days            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
2021 650          
2020 5,787   2,628      
2019 12,784   9,143      
2018 14,313   15,026      
2017 15,251   18,121      
2016 and prior 52,727   19,064      
2015 and Prior     55,661      
Total 101,512   119,643      
Student Loan | Consumer Portfolio Segment | Loan delinquent 90 days or greater past due            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
2021 281          
2020 2,303   460      
2019 7,418   4,642      
2018 9,734   9,396      
2017 11,347   12,939      
2016 and prior 42,054   14,710      
2015 and Prior     38,555      
Total 73,137   80,702      
Student Loan | Loans in-school/grace/deferment | Consumer Portfolio Segment            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
2021 1,351,990          
2020 1,661,199   1,374,085      
2019 1,108,155   1,330,175      
2018 616,392   733,824      
2017 423,102   508,478      
2016 and prior 694,442   327,763      
2015 and Prior     504,715      
Total 5,855,280   4,779,040      
Student Loan | Loans In forbearance | Consumer Portfolio Segment            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total Private Education Loans in forbearance, 2021 3,673          
Total Private Education Loans in forbearance, 2020 32,584   16,159      
Total Private Education Loans in forbearance, 2019 54,337   92,677      
Total Private Education Loans in forbearance, 2018 53,675   110,319      
Total Private Education Loans in forbearance, 2017 57,093   118,946      
Total Private Education Loans in forbearance, 2016 and Prior 156,063   109,073      
Total Private Education Loans in forbearance, 2015 and Prior     198,302      
Total Private Education Loans in forbearance $ 357,425   645,476      
Student Loan, Borrowers Who Did Not Return To School And Received Extenstion | Consumer Portfolio Segment            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total Private Education Loans in repayment, 2021     609,000      
Student Loan, Borrowers Who Did Not Return To School And Received Extenstion | Loans in-school/grace/deferment | Consumer Portfolio Segment            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
2021     401,000      
Student Loan, Borrowers Who Did Not Return To School And Received Extenstion | Loans In forbearance | Consumer Portfolio Segment            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total Private Education Loans in forbearance, 2021     $ 30,000