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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	Jun. 30, 2021	Dec. 31, 2020
TDR loans in repayment and percentage of each status:
Total Private Education Loans in repayment, 2021	$ 666,313
Troubled Debt Restructured Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
TDR loans in in-school/grace/deferment	86,667	$ 88,750
Total Private Education Loans in forbearance	58,441	76,704
TDR loans in repayment and percentage of each status:
Loans	1,192,743	1,274,590
Total Private Education Loans in repayment, 2021	$ 1,047,635	$ 1,109,136
Total TDR loans in repayment	100.00%	100.00%
Total	$ 1,192,743	$ 1,274,590
Loan delinquency, current
TDR loans in repayment and percentage of each status:
Loans	14,514,659	13,898,948
Total	14,514,659	13,898,948
Loan delinquency, current | Troubled Debt Restructured Loans
TDR loans in repayment and percentage of each status:
Loans	$ 959,797	$ 971,880
Loans current	91.60%	87.70%
Total	$ 959,797	$ 971,880
Loan delinquency 30-59 days
TDR loans in repayment and percentage of each status:
Loans	162,538	205,528
Total	162,538	205,528
Loan delinquency 30-59 days | Troubled Debt Restructured Loans
TDR loans in repayment and percentage of each status:
Loans	$ 38,500	$ 59,249
Loans delinquent	3.70%	5.30%
Total	$ 38,500	$ 59,249
Loan delinquency 60-89 days
TDR loans in repayment and percentage of each status:
Loans	85,451	119,643
Total	85,451	119,643
Loan delinquency 60-89 days | Troubled Debt Restructured Loans
TDR loans in repayment and percentage of each status:
Loans	$ 26,365	$ 43,576
Loans delinquent	2.50%	3.90%
Total	$ 26,365	$ 43,576
Loan delinquency 90 days or greater past due
TDR loans in repayment and percentage of each status:
Loans	62,727	80,702
Total	62,727	80,702
Loan delinquency 90 days or greater past due | Troubled Debt Restructured Loans
TDR loans in repayment and percentage of each status:
Loans	$ 22,973	$ 34,431
Loans delinquent	2.20%	3.10%
Total	$ 22,973	$ 34,431

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