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Allowance for Credit Losses - Age Analysis of Past Due Loans Delinquencies (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Jan. 01, 2020
Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Private Education Loans allowance for losses $ (1,357,075) $ (1,165,335) $ (1,361,723) $ (1,143,053) $ (441,912)
Loans held for investment, net $ 19,626,868 $ 20,341,283      
Percentage of Private Education Loans in repayment, Year 1 56.90% 59.00% 59.60%    
Percentage of Private Education Loans in repayment, Year 2 67.10% 67.90% 64.70%    
Percentage of Private Education Loans in repayment, Year 3 76.10% 74.30% 71.30%    
Percentage of Private Education Loans in repayment, Year 4 80.70% 79.30% 75.30%    
Percentage of Private Education Loans in repayment, Year 5 84.50% 82.90% 80.00%    
Percentage of Private Education Loans in repayment, Year 6 89.30% 87.40% 84.70%    
Percentage of Private Education Loans in repayment 74.50% 74.90% 72.50%    
Delinquent Private Education Loans in repayment as a percentage of Private Education Loans in repayment, Year 1 0.90% 0.80% 0.50%    
Delinquent Private Education Loans in repayment as a percentage of Private Education Loans in repayment, Year 2 1.90% 1.40% 1.20%    
Delinquent Private Education Loans in repayment as a percentage of Private Education Loans in repayment, Year 3 3.10% 2.90% 2.40%    
Delinquent Private Education Loans in repayment as a percentage of Private Education Loans in repayment, Year 4 4.00% 3.70% 3.20%    
Delinquent Private Education Loans in repayment as a percentage of Private Education Loans in repayment, Year 5 4.70% 4.30% 3.80%    
Delinquent Private Education Loans in repayment as a percentage of Private Education Loans in repayment, Year 6 6.50% 5.20% 4.80%    
Delinquent Private Education Loans in repayment as a percentage of Private Education Loans in repayment, total 3.80% 3.30% 2.80%    
Loans in forbearance as a percentage of loans in repayment and forbearance, Year 1 0.70% 0.50% 0.80%    
Loans in forbearance as a percentage of loans in repayment and forbearance, Year 2 2.10% 1.90% 3.40%    
Loans in forbearance as a percentage of loans in repayment and forbearance, Year 3 1.90% 2.10% 5.00%    
Loans in forbearance as a percentage of loans in repayment and forbearance, Year 4 2.10% 2.30% 5.90%    
Loans in forbearance as a percentage of loans in repayment and forbearance, Year 5 2.20% 2.50% 5.90%    
Loans in forbearance as a percentage of loans in repayment and forbearance, Year 6 2.00% 2.10% 4.90%    
Loans in forbearance as a percentage of loans in repayment and forbearance 1.80% 1.90% 4.30%    
Student Loan | Consumer Portfolio Segment          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Total Private Education Loans in forbearance, Year 1 $ 2,432,838 $ 2,253,860 $ 2,052,521    
Total Private Education Loans in forbearance, Year 2 3,049,477 2,826,916 2,603,996    
Total Private Education Loans in forbearance, Year 3 1,967,756 2,390,841 2,096,368    
Total Private Education Loans in forbearance, Year 4 1,754,219 1,840,790 1,912,370    
Total Private Education Loans in forbearance, Year 5 1,365,979 1,640,870 1,752,386    
Total Private Education Loans in forbearance, Year 6 4,559,281 4,557,935 3,887,180    
Private Education Loans in forbearance, total 15,129,550 15,511,212 14,304,821    
Total Private Education Loans, gross, Year 1 4,276,533 3,822,361 3,442,765    
Total Private Education Loans, gross, Year 2 4,547,159 4,166,283 4,026,848    
Total Private Education Loans, gross, Year 3 2,584,622 3,216,525 2,940,511    
Total Private Education Loans, gross, Year 4 2,172,660 2,320,060 2,539,794    
Total Private Education Loans, gross, Year 5 1,615,842 1,978,233 2,189,222    
Total Private Education Loans, gross, Year 6 5,106,872 5,213,401 4,590,197    
Total Private Education Loans, gross 20,303,688 20,716,863 19,729,337    
Private Education Loans deferred origination costs and unamortized premium/(discount), Year 1 26,714 22,169 21,129    
Private Education Loans deferred origination costs and unamortized premium/(discount), Year 2 15,933 16,067 13,933    
Private Education Loans deferred origination costs and unamortized premium/(discount), Year 3 9,062 9,575 8,671    
Private Education Loans deferred origination costs and unamortized premium/(discount), Year 4 5,496 5,918 6,708    
Private Education Loans deferred origination costs and unamortized premium/(discount), Year 5 3,575 4,588 5,721    
Private Education Loans deferred origination costs and unamortized premium/(discount), Year 6 8,876 9,171 7,313    
Private Education Loans deferred origination costs and unamortized premium/(discount), Total 69,656 67,488 63,475    
Total Private Education Loans, Year 1 4,303,247 3,844,530 3,463,894    
Total Private Education Loans, Year 2 4,563,092 4,182,350 4,040,781    
Total Private Education Loans, Year 3 2,593,684 3,226,100 2,949,182    
Total Private Education Loans, Year 4 2,178,156 2,325,978 2,546,502    
Total Private Education Loans, Year 5 1,619,417 1,982,821 2,194,943    
Total Private Education Loans, Year 6 5,115,748 5,222,572 4,597,510    
Total Private Education Loans 20,373,344 20,784,351 19,792,812    
Private Education Loans allowance for losses, Year 1 (304,943) (248,102) (210,875)    
Private Education Loans allowance for losses, Year 2 (323,506) (239,507) (298,776)    
Private Education Loans allowance for losses, Year 3 (181,915) (195,223) (218,136)    
Private Education Loans allowance for losses, Year 4 (141,424) (129,678) (184,265)    
Private Education Loans allowance for losses, Year 5 (101,023) (99,982) (150,150)    
Private Education Loans allowance for losses, Year 6 (300,820) (246,485) (293,642)    
Private Education Loans allowance for losses (1,353,631) (1,158,977) (1,355,844)    
Private Education Loans, net, Year 1 3,998,304 3,596,428 3,253,019    
Private Education Loans, net, Year 2 4,239,586 3,942,843 3,742,005    
Private Education Loans, net, Year 3 2,411,769 3,030,877 2,731,046    
Private Education Loans, net, Year 4 2,036,732 2,196,300 2,362,237    
Private Education Loans, net, Year 5 1,518,394 1,882,839 2,044,793    
Private Education Loans, net, Year 6 4,814,928 4,976,087 4,303,868    
Loans held for investment, net 19,019,713 19,625,374 18,436,968    
Student Loan | Consumer Portfolio Segment | Loan delinquent, current          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Year 1 2,411,441 2,234,876 2,043,033    
Year 2 2,991,839 2,786,646 2,573,228    
Year 3 1,907,574 2,321,728 2,045,012    
Year 4 1,683,986 1,772,651 1,850,539    
Year 5 1,301,809 1,570,815 1,685,572    
After Year 5 4,262,698 4,319,057 3,701,564    
Loan type 14,559,347 15,005,773 13,898,948    
Student Loan | Consumer Portfolio Segment | Loan delinquent 30-59 days          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Year 1 14,164 15,148 6,400    
Year 2 30,740 29,146 16,983    
Year 3 30,877 46,616 26,934    
Year 4 35,213 43,197 30,771    
Year 5 31,366 41,695 33,040    
After Year 5 144,948 132,757 91,400    
Loan type 287,308 308,559 205,528    
Student Loan | Consumer Portfolio Segment | Loan delinquent 60-89 days          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Year 1 5,523 3,194 2,628    
Year 2 15,056 7,441 9,143    
Year 3 14,433 14,044 15,026    
Year 4 18,201 14,310 18,121    
Year 5 16,697 16,425 19,064    
After Year 5 77,595 61,533 55,661    
Loan type 147,505 116,947 119,643    
Student Loan | Consumer Portfolio Segment | Loan delinquent 90 days or greater past due          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Year 1 1,710 642 460    
Year 2 11,842 3,683 4,642    
Year 3 14,872 8,453 9,396    
Year 4 16,819 10,632 12,939    
Year 5 16,107 11,935 14,710    
After Year 5 74,040 44,588 38,555    
Loan type 135,390 79,933 80,702    
Student Loan | Loans In-School/Grace/Deferment | Consumer Portfolio Segment          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Year 1 1,827,649 1,556,550 1,374,085    
Year 2 1,433,322 1,283,523 1,330,175    
Year 3 578,253 773,320 733,824    
Year 4 380,639 435,657 508,478    
Year 5 219,280 296,008 327,763    
After Year 5 455,910 559,356 504,715    
Loan type 4,895,053 4,904,414 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, Year 1 16,046 11,951 16,159    
Total Private Education Loans in forbearance, Year 2 64,360 55,844 92,677    
Total Private Education Loans in forbearance, Year 3 38,613 52,364 110,319    
Total Private Education Loans in forbearance, Year 4 37,802 43,613 118,946    
Total Private Education Loans in forbearance, Year 5 30,583 41,355 109,073    
Total Private Education Loans in forbearance, Year 6 91,681 96,110 198,302    
Private Education Loans in forbearance, total $ 279,085 $ 301,237 645,476    
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 forbearance, Year 1     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]          
Year 1     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, Year 1     $ 30,000