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Loans Held for Investment - Student Loan Portfolio by Program (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Jan. 01, 2020
Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Allowance for credit losses $ (1,357,075) $ (1,165,335) $ (1,361,723) $ (1,143,053) $ (441,912)
Loans held for investment, net 19,626,868 20,341,283      
Private Education Loans          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loan type 20,303,688 20,716,863      
Deferred origination costs and unamortized premium/ (discount) 69,656 67,488      
Allowance for credit losses (1,353,631) (1,158,977)     (374,300)
Loans held for investment, net 19,019,713 19,625,374      
Private Education Loans | Fixed-rate          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loan type 11,108,079 9,920,547      
Private Education Loans | Variable-rate          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loan type 9,195,609 10,796,316      
FFELP Loans          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loan type 609,050 695,216      
Deferred origination costs and unamortized premium/ (discount) 1,549 1,815      
Allowance for credit losses (3,444) (4,077)     (1,633)
Loans held for investment, net 607,155 692,954      
Credit Cards          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loan type 0 25,014      
Deferred origination costs and unamortized premium/ (discount) 0 222      
Allowance for credit losses 0 (2,281)     $ (102)
Loans held for investment, net $ 0 $ 22,955