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Allowance for Credit Losses - Loan Status and Aging of Past Due TDR Loans (Details) - Student Loan - Consumer Portfolio Segment - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
TDR loans in repayment and percentage of each status:
Total Private Education Loans in repayment, 2021	$ 418,469
Total	14,471,427	$ 13,898,948
Troubled Debt Restructured Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
TDR loans in in-school/grace/deferment	93,850	88,750
TDR loans in repayment and percentage of each status:
Total Private Education Loans in forbearance, 2021	68,609	76,704
Loans current	966,201	971,880
Total Private Education Loans in repayment, 2021	$ 1,063,145	$ 1,109,136
Loans current	90.90%	87.70%
Total TDR loans in repayment	100.00%	100.00%
Total	$ 1,225,604	$ 1,274,590
Loan delinquency 30-59 days
TDR loans in repayment and percentage of each status:
Total	152,743	205,528
Loan delinquency 30-59 days | Troubled Debt Restructured Loans
TDR loans in repayment and percentage of each status:
Loans delinquent	$ 39,541	$ 59,249
Loans delinquent	3.70%	5.30%
Loan delinquency 60-89 days
TDR loans in repayment and percentage of each status:
Total	$ 86,390	$ 119,643
Loan delinquency 60-89 days | Troubled Debt Restructured Loans
TDR loans in repayment and percentage of each status:
Loans delinquent	$ 29,892	$ 43,576
Loans delinquent	2.80%	3.90%
Loan delinquency 90 days or greater past due
TDR loans in repayment and percentage of each status:
Total	$ 67,379	$ 80,702
Loan delinquency 90 days or greater past due | Troubled Debt Restructured Loans
TDR loans in repayment and percentage of each status:
Loans delinquent	$ 27,511	$ 34,431
Loans delinquent	2.60%	3.10%

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