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Loans Held for Investment - Student Loan Portfolio Average Balances (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Balance	$ 21,672,992	$ 23,226,973	$ 21,597,450	$ 23,891,957
Private Education Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Balance	$ 20,944,581	$ 21,937,758	$ 20,860,973	$ 22,342,353
Weighted Average Interest Rate	8.26%	8.24%	8.23%	8.48%
FFELP Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Balance	$ 713,517	$ 750,925	$ 723,656	$ 762,863
Weighted Average Interest Rate	3.45%	3.46%	3.43%	3.86%
Personal Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Balance	$ 0	$ 527,204	$ 0	$ 778,153
Weighted Average Interest Rate	0.00%	12.86%	0.00%	12.43%
Credit Cards
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Balance	$ 14,894	$ 11,086	$ 12,821	$ 8,588
Weighted Average Interest Rate	6.95%	(6.58%)	4.97%	(7.20%)

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