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Allowance for Credit Losses - Age Analysis of Past Due Loans Delinquencies (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Private Education Loans allowance for losses | $ (1,165,335) | $ (1,361,723) | $ (441,912) | $ (341,121)
Loans held for investment, net | $ 20,341,283 | $ 19,183,143 |  |
Percentage of Private Education Loans in repayment, Year 1 | 59.00% | 59.60% | 58.20% |
Percentage of Private Education Loans in repayment, Year 2 | 67.90% | 64.70% | 65.40% |
Percentage of Private Education Loans in repayment, Year 3 | 74.30% | 71.30% | 71.20% |
Percentage of Private Education Loans in repayment, Year 4 | 79.30% | 75.30% | 77.20% |
Percentage of Private Education Loans in repayment, Year 5 | 82.90% | 80.00% | 82.20% |
Percentage of Private Education Loans in repayment, Year 6 | 87.40% | 84.70% | 85.40% |
Percentage of Private Education Loans in repayment | 74.90% | 72.50% | 72.40% |
Delinquent Private Education Loans in repayment as a percentage of Private Education Loans in repayment, Year 1 | 0.80% | 0.50% | 0.60% |
Delinquent Private Education Loans in repayment as a percentage of Private Education Loans in repayment, Year 2 | 1.40% | 1.20% | 1.20% |
Delinquent Private Education Loans in repayment as a percentage of Private Education Loans in repayment, Year 3 | 2.90% | 2.40% | 2.40% |
Delinquent Private Education Loans in repayment as a percentage of Private Education Loans in repayment, Year 4 | 3.70% | 3.20% | 3.20% |
Delinquent Private Education Loans in repayment as a percentage of Private Education Loans in repayment, Year 5 | 4.30% | 3.80% | 4.00% |
Delinquent Private Education Loans in repayment as a percentage of Private Education Loans in repayment, Year 6 | 5.20% | 4.80% | 5.00% |
Delinquent Private Education Loans in repayment as a percentage of Private Education Loans in repayment, total | 3.30% | 2.80% | 2.80% |
Loans in forbearance as a percentage of loans in repayment and forbearance, Year 1 | 0.50% | 0.80% | 0.90% |
Loans in forbearance as a percentage of loans in repayment and forbearance, Year 2 | 1.90% | 3.40% | 3.30% |
Loans in forbearance as a percentage of loans in repayment and forbearance, Year 3 | 2.10% | 5.00% | 4.80% |
Loans in forbearance as a percentage of loans in repayment and forbearance, Year 4 | 2.30% | 5.90% | 5.20% |
Loans in forbearance as a percentage of loans in repayment and forbearance, Year 5 | 2.50% | 5.90% | 5.20% |
Loans in forbearance as a percentage of loans in repayment and forbearance, Year 6 | 2.10% | 4.90% | 4.70% |
Loans in forbearance as a percentage of loans in repayment and forbearance | 1.90% | 4.30% | 4.10% |
Student Loan | Consumer Portfolio Segment |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Private Education Loans in forbearance, Year 1 | $ 2,253,860 | $ 2,052,521 | $ 2,355,395 |
Total Private Education Loans in forbearance, Year 2 | 2,826,916 | 2,603,996 | 3,199,351 |
Total Private Education Loans in forbearance, Year 3 | 2,390,841 | 2,096,368 | 2,850,380 |
Total Private Education Loans in forbearance, Year 4 | 1,840,790 | 1,912,370 | 2,651,946 |
Total Private Education Loans in forbearance, Year 5 | 1,640,870 | 1,752,386 | 2,317,788 |
Total Private Education Loans in forbearance, Year 6 | 4,557,935 | 3,887,180 | 3,412,810 |
Private Education Loans in forbearance, total | 15,511,212 | 14,304,821 | 16,787,670 |
Total Private Education Loans, gross, Year 1 | 3,822,361 | 3,442,765 | 4,047,048 |
Total Private Education Loans, gross, Year 2 | 4,166,283 | 4,026,848 | 4,888,373 |
Total Private Education Loans, gross, Year 3 | 3,216,525 | 2,940,511 | 4,003,485 |
Total Private Education Loans, gross, Year 4 | 2,320,060 | 2,539,794 | 3,433,858 |
Total Private Education Loans, gross, Year 5 | 1,978,233 | 2,189,222 | 2,821,172 |
Total Private Education Loans, gross, Year 6 | 5,213,401 | 4,590,197 | 3,995,655 |
Total Private Education Loans, gross | 20,716,863 | 19,729,337 | 23,189,591 |
Private Education Loans deferred origination costs and unamortized premium/(discount), Year 1 | 22,169 | 21,129 | 23,661 |
Private Education Loans deferred origination costs and unamortized premium/(discount), Year 2 | 16,067 | 13,933 | 17,699 |
Private Education Loans deferred origination costs and unamortized premium/(discount), Year 3 | 9,575 | 8,671 | 13,843 |
Private Education Loans deferred origination costs and unamortized premium/(discount), Year 4 | 5,918 | 6,708 | 12,304 |
Private Education Loans deferred origination costs and unamortized premium/(discount), Year 5 | 4,588 | 5,721 | 8,564 |
Private Education Loans deferred origination costs and unamortized premium/(discount), Year 6 | 9,171 | 7,313 | 5,153 |
Private Education Loans deferred origination costs and unamortized premium/(discount), Total | 67,488 | 63,475 | 81,224 |
Total Private Education Loans, Year 1 | 3,844,530 | 3,463,894 | 4,070,709 |
Total Private Education Loans, Year 2 | 4,182,350 | 4,040,781 | 4,906,072 |
Total Private Education Loans, Year 3 | 3,226,100 | 2,949,182 | 4,017,328 |
Total Private Education Loans, Year 4 | 2,325,978 | 2,546,502 | 3,446,162 |
Total Private Education Loans, Year 5 | 1,982,821 | 2,194,943 | 2,829,736 |
Total Private Education Loans, Year 6 | 5,222,572 | 4,597,510 | 4,000,808 |
Total Private Education Loans | 20,784,351 | 19,792,812 | 23,270,815 |
Private Education Loans allowance for losses, Year 1 | (248,102) | (210,875) | (3,013) |
Private Education Loans allowance for losses, Year 2 | (239,507) | (298,776) | (19,105) |
Private Education Loans allowance for losses, Year 3 | (195,223) | (218,136) | (44,858) |
Private Education Loans allowance for losses, Year 4 | (129,678) | (184,265) | (71,598) |
Private Education Loans allowance for losses, Year 5 | (99,982) | (150,150) | (80,974) |
Private Education Loans allowance for losses, Year 6 | (246,485) | (293,642) | (154,752) |
Private Education Loans allowance for losses | (1,158,977) | (1,355,844) | (374,300) |
Private Education Loans, net, Year 1 | 3,596,428 | 3,253,019 | 4,067,696 |
Private Education Loans, net, Year 2 | 3,942,843 | 3,742,005 | 4,886,967 |
Private Education Loans, net, Year 3 | 3,030,877 | 2,731,046 | 3,972,470 |
Private Education Loans, net, Year 4 | 2,196,300 | 2,362,237 | 3,374,564 |
Private Education Loans, net, Year 5 | 1,882,839 | 2,044,793 | 2,748,762 |
Private Education Loans, net, Year 6 | 4,976,087 | 4,303,868 | 3,846,056 |
Loans held for investment, net | 19,625,374 | 18,436,968 | 22,896,515 |
Student Loan | Consumer Portfolio Segment | Loan delinquent, current |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Year 1 | 2,234,876 | 2,043,033 | 2,340,221 |
Year 2 | 2,786,646 | 2,573,228 | 3,159,878 |
Year 3 | 2,321,728 | 2,045,012 | 2,781,132 |
Year 4 | 1,772,651 | 1,850,539 | 2,566,815 |
Year 5 | 1,570,815 | 1,685,572 | 2,225,721 |
Year 6 | 4,319,057 | 3,701,564 | 3,241,884 |
Total | 15,005,773 | 13,898,948 | 16,315,651 |
Student Loan | Consumer Portfolio Segment | Loan delinquent 30-59 days |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Year 1 | 15,148 | 6,400 | 11,152 |
Year 2 | 29,146 | 16,983 | 26,096 |
Year 3 | 46,616 | 26,934 | 44,382 |
Year 4 | 43,197 | 30,771 | 51,656 |
Year 5 | 41,695 | 33,040 | 54,559 |
Year 6 | 132,757 | 91,400 | 100,206 |
Total | 308,559 | 205,528 | 288,051 |
Student Loan | Consumer Portfolio Segment | Loan delinquent 60-89 days |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Year 1 | 3,194 | 2,628 | 3,087 |
Year 2 | 7,441 | 9,143 | 9,527 |
Year 3 | 14,044 | 15,026 | 17,048 |
Year 4 | 14,310 | 18,121 | 21,161 |
Year 5 | 16,425 | 19,064 | 24,562 |
Year 6 | 61,533 | 55,661 | 45,917 |
Total | 116,947 | 119,643 | 121,302 |
Student Loan | Consumer Portfolio Segment | Loan delinquent 90 days or greater past due |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Year 1 | 642 | 460 | 935 |
Year 2 | 3,683 | 4,642 | 3,850 |
Year 3 | 8,453 | 9,396 | 7,818 |
Year 4 | 10,632 | 12,939 | 12,314 |
Year 5 | 11,935 | 14,710 | 12,946 |
Year 6 | 44,588 | 38,555 | 24,803 |
Total | 79,933 | 80,702 | 62,666 |
Student Loan | Loans In-School/Grace/Deferment | Consumer Portfolio Segment |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Year 1 | 1,556,550 | 1,374,085 | 1,670,644 |
Year 2 | 1,283,523 | 1,330,175 | 1,580,513 |
Year 3 | 773,320 | 733,824 | 1,010,764 |
Year 4 | 435,657 | 508,478 | 635,798 |
Year 5 | 296,008 | 327,763 | 375,585 |
Year 6 | 559,356 | 504,715 | 414,101 |
Total | 4,904,414 | 4,779,040 | 5,687,405 |
Student Loan | Loans In Forbearance | Consumer Portfolio Segment |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Private Education Loans in forbearance, Year 1 | 11,951 | 16,159 | 21,009 |
Total Private Education Loans in forbearance, Year 2 | 55,844 | 92,677 | 108,509 |
Total Private Education Loans in forbearance, Year 3 | 52,364 | 110,319 | 142,341 |
Total Private Education Loans in forbearance, Year 4 | 43,613 | 118,946 | 146,114 |
Total Private Education Loans in forbearance, Year 5 | 41,355 | 109,073 | 127,799 |
Total Private Education Loans in forbearance, Year 6 | 96,110 | 198,302 | 168,744 |
Private Education Loans in forbearance, total | 301,237 | 645,476 | 714,516 |
Personal Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Private Education Loans allowance for losses |  |  | $ (65,877) |
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 |  |

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