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Loans Held for Investment - Student Loan Portfolio Average Balances (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Balance	$ 21,701,229	$ 23,776,111	$ 24,181,174
Private Education Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Balance	$ 20,968,061	$ 22,426,216	$ 22,225,473
Weighted Average Interest Rate	8.25%	8.42%	9.32%
FFELP Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Balance	$ 718,186	$ 757,953	$ 814,198
Weighted Average Interest Rate	3.43%	3.76%	4.79%
Personal Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Balance	$ 0	$ 582,552	$ 1,141,503
Weighted Average Interest Rate	0.00%	12.43%	12.09%
Credit Cards
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Balance	$ 14,982	$ 9,390	$ 0
Weighted Average Interest Rate	4.67%	(6.04%)	0.00%

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- Definition

Financing Receivable, Before Allowance For Credit Loss, Average Balance

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